1326 results about "Cofferdam" patented technology

The invention discloses a double-row steel sheet pile cofferdam construction method, which comprises the following steps of: before construction, measuring the original riverbed elevation of a cofferdam piling area, organizing steel pipes to enter a site according to a cross-section diagram and a construction sequence of a cofferdam, timely removing and recording if stone blocks and the like at the river bottom are measured in the measurement process, and before construction, checking and maintaining all mechanical equipment, so that the construction efficiency is improved. After entering the field, the steel pipes are stacked according to specifications, varieties and classifications, before pile conveying, the models and the number of the steel pipes used during construction are determined, and the steel pipes are arranged strictly according to the designed section. Compared with a construction scheme of adopting a Larsen steel sheet pile cofferdam and a temporary construction platform, the construction cost, the rental cost, the earthwork transportation cost, the earthwork compaction cost, the earthwork filling excavation filling cost and the like of temporary facilities can be saved, building construction is carried out in a water area needing a large area, the construction period is long, and the construction cost is low. The method is more economical and reasonable when being used for constructing structures in water under the conditions of high water level and the like.

The invention relates to the technical field of high-precision positioning in water surface construction, and discloses a Beidou positioning-based cofferdam positioning method for bridge construction, which comprises the following steps: S1, initializing Beidou RTK, setting a base station, acquiring an initial position of a cofferdam, and realizing centimeter-level positioning by using differential correction; s2, fluid-solid coupling modeling is carried out, a dynamic model of the cofferdam under the action of water flow, tide and wind power is established based on a computational fluid mechanics method, and stress and deformation of the cofferdam are calculated in combination with finite element analysis; and S3, estimating an unscented Kalman filtering state, and calculating the current position, speed and error range of the cofferdam based on the historical position information of the cofferdam and fluid-solid coupling modeling prediction data. According to the method, the timeliness of error correction is ensured through an error loop feedback mechanism and a real-time alarm function, the robustness and stability of the system are improved, and the positioning precision and reliability of the cofferdam in the construction process are remarkably improved.

The invention discloses a device and method for monitoring settlement of an earth rock cofferdam, and relates to the technical field of concrete curing, the device comprises a monitoring sensor unit 1, the monitoring sensor unit 1 comprises a settlement sensor for measuring tiny settlement change, an inclination sensor for monitoring whether the cofferdam is inclined in the settlement process, and a data collector, the data collector is connected with the detection sensor unit, the data collector is used for collecting data measured by the settlement sensor and the inclination sensor, and the data collector is further provided with a wireless transmission module used for wirelessly transmitting the collected data to a remote monitoring center; according to the device and method for monitoring settlement of the earth rock cofferdam, monitoring data can be displayed and stored in real time, a report is generated through data analysis and a visual tool, and engineering management personnel can conduct risk assessment and construction progress management conveniently. The decision-making efficiency is improved, and comprehensive control over the safety of the cofferdam is enhanced.

The invention discloses a steel sheet pile cofferdam and underwater pier construction technology suitable for a geological environment near a water area. The steel sheet pile cofferdam and underwater pier construction technology comprises the following steps that the position of a steel sheet pile wall is planned; constructing a guide frame body for assisting in inserting and driving the steel sheet piles corresponding to the position of the steel sheet pile wall; steel sheet piles are sequentially and vertically inserted in the positions, corresponding to the steel sheet pile wall, of the guide frame body in a locking mode, and the steel sheet pile wall is formed; and closing operation is conducted according to the head end and the tail end of the formed steel sheet pile wall. The technical problem that in the prior art, a steel sheet pile cofferdam construction technology is not high in function applicability in the aspects of steel sheet pile inserting and driving quality, a foundation pit excavation and supporting system and construction environment adaptability is solved.

The invention relates to a dynamic grid-based foundation pit temperature field-seepage-stress field coupling calculation method, which comprises the following steps of: establishing a nonlinear dynamic bidirectional coupling constitutive relationship of a temperature field, a seepage field and a stress field containing a two-dimensional foundation pit cofferdam, and obtaining a three-field full coupling equation set; in combination with a GPU acceleration solver, solving the three-field full-coupling equation set by adopting a sub-domain decoupling-asynchronous iteration strategy; and performing real-time early warning on the cofferdam construction period according to a solving result. The method has the advantages that compared with a traditional linear model, the precision of the established three-field full-coupling equation set is improved, and the interaction influence relation of three fields can be well simulated.

The invention relates to the technical field of river bank protection, in particular to a river bank slope protection for cofferdam construction and a construction method thereof. S2, construction of a near-water area structure; s3, construction of a far water area structure; s4, ecological enhancement; triple optimization of river bank protection is achieved through dynamic water level monitoring and modular design, a double-layer reinforced concrete and elastic sealant structure is adopted in a near-water area, the compressive strength is improved by 20%, the crack width is smaller than or equal to 0.2 mm, and material waste is reduced by 15% in cooperation with dynamic width adjustment (+ / -2 m); the mold bag concrete slope protection is combined with an atomization spraying system, the anti-scouring capacity reaches 5 m / (m.s), the vegetation coverage rate is larger than or equal to 80% within 3 months, and the water and soil loss rate is reduced by 70%; the modular honeycomb structure inflation assembly efficiency is improved by 40%, the transportation cost is reduced by 50%, the distributed sensors achieve structure displacement / pressure three-level early warning, the operation and maintenance cost is reduced by 70%, the overall service life is prolonged by more than 5 years, and an ecological-engineering collaborative protection system is formed.

The utility model relates to a steel cofferdam structure for deepwater foundation auxiliary construction. The method is suitable for the technical field of cofferdams. According to the technical scheme, the cofferdam comprises a plurality of corner connecting units and cofferdam wall bodies arranged between every two adjacent corner connecting units. The cofferdam wall body comprises at least one cofferdam unit, and the cofferdam unit is formed by splicing a plurality of hollow steel plates; a first limiting column is arranged on the right side face of the hollow steel plate, a first limiting clamping groove capable of being matched with the first limiting column is formed in the left side face of the hollow steel plate, and a sealing air bag matched with a gap between the first limiting clamping groove and the first limiting column is arranged in the first limiting clamping groove. The top of the hollow steel plate is provided with a top sealing structure, and the bottom of the hollow steel plate is provided with a bottom sealing structure matched with the top sealing structure to achieve sealing. At least one connecting seat is fixed on the inner side surface of the hollow steel plate; a supporting and fixing mechanism is arranged in the steel cofferdam structure and fixedly connected with the connecting bases of the hollow steel plates on the steel cofferdam structure.

The invention relates to the technical field of underwater engineering, and discloses a steel pipe pile cofferdam and a cofferdam construction method.The steel pipe pile cofferdam comprises a plurality of steel pipe columns, the two sides of each steel pipe column are each provided with a first lock catch and a second lock catch which extend in the length direction of the steel pipe column, and steel pipe piles are buckled in pairs through the corresponding first lock catches and second lock catches; a sealing cavity is formed between the first lock catch and the second lock catch, and the sealing cavity is sequentially divided into a sealing cavity, an induction cavity and a grouting cavity from the outer side to the inner side of the cofferdam; the sealing cavity and the sensing cavity are separated through the elastic water stop lips, and shape memory alloy wires are arranged in the elastic water stop lips. The cofferdam has the beneficial effects that the first layer of sealing structure is formed by arranging the mechanical seal, then the second layer of sealing structure and the third layer of sealing structure are formed by the elastic water stop lip and the grouting area, and water located on the outer side of the cofferdam is prevented from entering the inner side of the cofferdam step by step through the three layers of sealing.

The invention discloses a cofferdam device for hydraulic engineering construction and an operation method thereof.The device comprises a cofferdam, buffering mechanisms arranged on the periphery of the exterior of the cofferdam, reinforcing mechanisms arranged on the periphery of the exterior of the cofferdam and driving control mechanisms arranged at the four corners of the cofferdam, and the cofferdam is composed of supporting columns and steel plates and forms a rectangular frame structure; the reinforcing mechanism is connected with a first fixing block and a second fixing block through a reinforcing rod to enhance the stability of the cofferdam, the driving control mechanism is composed of a forward and reverse motor, a sliding groove, a threaded rod and a sliding block and can automatically adjust the position of the buffering mechanism according to the change of the water level, and the buffering mechanism comprises a supporting rod, an arc-shaped first elastic plate, an arc-shaped second elastic plate and a first damper. Impact energy is absorbed through elastic deformation and damping force, and the cofferdam is protected against impact of water flow and floating objects. The position of the buffer mechanism can be automatically adjusted according to the water level condition, and it is ensured that the buffer mechanism is located at the optimal working position all the time so as to meet the buffer requirements under different water level conditions.

The invention relates to the technical field of water conservancy control, and discloses a water conservancy project cofferdam gate control system based on a PLC, and the system comprises a hydraulic drive and detection assembly and a controller. A discrete state observation module, a disturbance characteristic identification module, a virtual axis parameter scheduling module and a control law synthesis module are configured in the controller. The discrete state observation module reconstructs a system state and estimates total disturbance; the disturbance characteristic identification module judges normal, jamming or turbulent working conditions according to the disturbance characteristics; the virtual axis parameter scheduling module adjusts the virtual stiffness and the damping coefficient in real time according to the working condition, or executes an asymmetric auxiliary escape strategy; the control law synthesis module combines state feedback and feed-forward compensation to generate a control voltage. Through multi-modal parameter scheduling, water flow impact and non-linear friction interference are effectively overcome, decoupling under the turbulent working condition and flexible protection and auxiliary escape under the jamming working condition are achieved, and the synchronization precision and safety of gate control are improved.

The invention relates to the technical field of water conservancy project cofferdam construction, and discloses a cofferdam backfill supporting device which comprises a filler pipeline, a guide part is arranged on the filler pipeline, a positioning groove is formed in the outer wall of the filler pipeline, a supporting part is arranged on the filler pipeline, and the supporting part comprises a first supporting ring and a second supporting ring. The first supporting ring is slidably connected with the outer wall of the filling pipeline, a support is fixedly connected between the first supporting ring and the second supporting ring, a positioning part is arranged on the support and comprises a rod sleeve, and the rod sleeve is fixedly connected to the support. The guiding part and the supporting part are matched to avoid inclination and deviation of the pipeline, the positioning part and the calibration part are matched to improve the hole site calibration precision, the limiting part achieves conflict-free switching between the calibration part and backfill material injection, finally it is guaranteed that backfill materials are evenly filled, the problems of scattering and cavities do not exist, and the requirements for cofferdam impermeability and structural stability are met.

The present invention relates to the field of digital twin technology, and in particular to a method and system for intelligent monitoring of bridge steel cofferdam construction based on digital twin. The method comprises the following steps: obtaining bridge steel cofferdam construction data; creating a full-element digital twin model according to the bridge steel cofferdam construction data to obtain a bridge steel cofferdam digital twin model; obtaining real-time bridge steel cofferdam data, and performing fusion mapping according to the real-time bridge steel cofferdam data and the bridge steel cofferdam digital twin model to obtain a bridge steel cofferdam dynamic model; performing real-time monitoring according to the bridge steel cofferdam dynamic model to obtain bridge steel cofferdam construction monitoring data, and performing dynamic risk assessment according to the bridge steel cofferdam construction monitoring data to obtain bridge steel cofferdam construction risk data, so as to perform intelligent monitoring operations for bridge steel cofferdam construction. The present invention continuously updates the digital twin scene through massive scenes and monitoring data, and realizes visualization, intelligent monitoring and early warning of the entire process of bridge steel cofferdam construction.

The invention relates to the technical field of water conservancy projects, in particular to a cofferdam for ship lock transformation and a construction method. A cofferdam for ship lock transformation comprises concrete cofferdam bodies and hollow concrete supporting structures, the concrete cofferdam bodies are tightly attached to the wall faces on the two sides of a ship lock and extend in the water flow direction, and the hollow concrete supporting structures are arranged between every two adjacent concrete cofferdam bodies. The hollow concrete supporting structure is fixedly connected with the concrete cofferdam body through a connecting device, the hollow concrete supporting structure comprises a bottom layer, a hollow layer and a top layer, a plurality of rows of cavities arranged side by side are formed in the hollow layer, and blasting devices are pre-buried in the concrete wall between every two adjacent cavities at equal intervals. The concrete cofferdam body is tightly attached to the wall face of the ship lock, a stable water retaining barrier can be formed, the self weight can be reduced through the design of the hollow layer, and compared with traditional mechanical or manual dismantling, efficient and controllable dismantling can be achieved through the blasting device embedded in the supporting structure, and the construction period can be greatly shortened.

The invention relates to the technical field of water conservancy projects, in particular to an anti-seepage control system for an earth rock cofferdam. The method comprises the following steps: periodically acquiring external hydro meteorological data and internal structure response data of a cofferdam through a sensor group based on a monitoring unit; establishing a multi-field coupling model based on a finite element method through a model building unit, and dynamically coupling a wave load, a tidal water level and an osmotic pressure field; the minimum cofferdam crest elevation is determined by comparing the difference between the minimum safety coefficient and a preset safety coefficient on the basis of a decision-making unit; and based on the analysis unit, inputting the minimum cofferdam crest elevation into the multi-field coupling model to obtain the maximum value of the hydraulic gradient of the escape point of the downstream slope within a third preset time period, determining an anti-seepage state based on the maximum value, and adjusting related parameters based on the anti-seepage state. The seepage risk of the cofferdam is monitored, predicted and actively controlled in real time, so that the seepage rate of the earth rock cofferdam is reduced.

The invention discloses a steel casing cofferdam anchoring operation method for a deepwater hard rock area, and belongs to the technical field of overwater construction platforms, a cofferdam, a steel casing and a drilling platform are included, before the cofferdam is lowered, bed rock cleaning is completed through layered excavation and impact treatment, a karst cave is filled with an underwater concrete ball pulling method, and the stability of a foundation is improved. When the steel casing and the drilling platform pipe pile are installed, the bottom adjusting device is used for adjusting the angle, ensuring the perpendicularity, shortening the construction period and reducing the labor cost and the safety risk. The pipe piles are fixedly connected with the cofferdam through a connecting system. According to the method, the bed rock is treated, the impact resistance and disturbance resistance can be improved, the service life of the platform is prolonged, and reliable support is provided for bridge construction. Accurate positioning and layered excavation are achieved, disturbance to rock stratums and karst caves is reduced, the influence on the ecological environment is reduced, and meanwhile the construction quality and efficiency are guaranteed.

The bank protection cofferdam structure comprises a first pile row and a second pile row which are arranged in parallel, the first pile row and the second pile row are driven in soil, the upper end of the first pile row and the upper end of the second pile row are connected through an opposite-pulling mechanism, a first bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the first pile row, and a second bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the second pile row. A second bamboo raft piece layer and geotechnical cloth are arranged on the inner side of the second pile row, backfill soil is arranged between the first pile row and the second pile row, and bagged soil is evenly laid on the top of the backfill soil. The anti-seepage performance and the stability of the revetment cofferdam structure can be improved.

The invention discloses an irrigation channel maintenance cofferdam system and a maintenance method, the system comprises a vehicle body with an arm, a rotating device, a cofferdam device and a sealing structure, a cantilever is hinged to the tail end of a working arm of the vehicle body with the arm, the rotating device is mounted at the lower end of the cantilever, and the cofferdam device is mounted at the lower end of the rotating device; the cofferdam device comprises a first baffle and second baffles, the two second baffles are installed at the left end and the right end of the first baffle correspondingly, an included angle is formed between each second baffle and the first baffle, and sealing structures are installed on the lower sides of the first baffle and the second baffles and the sides, away from the first baffle, of the second baffles correspondingly. A connecting base is installed on the upper side of the first baffle and connected with the rotating device. When the cofferdam device is installed, the cofferdam device is fixed through the working arm of the truck body with the arm, and the cofferdam device is more convenient to install.

The invention belongs to the technical field of crossing of artificial intelligence and computational mechanics, and particularly relates to an artificial intelligence-based MPM simulation method and system for a mold bag sand cofferdam, a three-dimensional simulation system of the mold bag sand cofferdam is constructed in combination with an MPM method, and the penetration state of sand and geotechnical cloth is detected in an accelerated manner by utilizing a penetration tracking algorithm and spatial Hash. An artificial intelligence algorithm is introduced, a reward function is designed with minimum penetration depth and penetration times as targets, penetration prediction of MPM particles is driven, the speed and stress of the MPM particles are further dynamically regulated and controlled on the basis of a predicted contact model and the artificial intelligence algorithm, penetration is prevented, numerical stability is ensured, and the prediction accuracy of the MPM particles is improved. The calculation precision is improved by adopting implicit integration and gradient descent methods; and bidirectional coupling of the sand and the geotechnical cloth is realized through a visualization module. The problems that in a traditional method, coupling simulation of sandy soil and a flexible structure is low in efficiency, easy to penetrate, unstable in numerical value and the like are solved, and the accuracy and reliability of simulation analysis of the mold bag sand cofferdam structure under the complex working condition are remarkably improved.

The invention provides a foundation pit cofferdam stacked self-balancing steel support supporting device, which relates to the field of water conservancy projects and comprises cofferdam protection plates, cofferdam self-balancing steel, a self-balancing shield, self-balancing telescopic steel, stable angle iron, a cofferdam protection mechanism and a cofferdam assembly mechanism. The cofferdam self-balancing steel is fixedly connected to the inner end face of the cofferdam protection plate. The self-balancing shield is arranged on the inner end face of the cofferdam self-balancing steel; the self-balancing telescopic steel is connected to the outer end face of the self-balancing protective cover in a sliding mode. The stable angle iron is fixed on the self-balancing telescopic steel and the cofferdam self-balancing steel; the cofferdam protection mechanism is arranged on the cofferdam protection plate; and the cofferdam assembling mechanism is arranged in the self-balancing shield. By the adoption of the cofferdam protection mechanism, the safety of pier construction protection is improved, and by the adoption of the cofferdam assembly mechanism, workers can conveniently construct the supporting device. The problem that the follow-up normal construction of the pier is affected due to the fact that river water is prone to gushing into the protection plate is solved.

The invention relates to the technical field of hydraulic engineering, in particular to a construction method of a water-saving ship lock, comprising the following steps: S1, excavating a foundation pit at the position of the water-saving ship lock, and building a cofferdam at the upstream of the foundation pit to form a dry construction area in the foundation pit; s2, the bottom face of the foundation pit is excavated to form a lock chamber, mountain bodies on the two sides of the foundation pit are excavated, and excavated sections are leveled to form mountain body side slopes; s3, gate walls are poured on the two sides of the gate chamber, a side slope lining is formed on the mountain side slope in a pouring mode, a bottom face lining is formed on the bottom face of the foundation pit between the mountain side slope and the adjacent gate walls in a pouring mode, and a water retaining dam and a retaining wall are poured on the upstream and the downstream of the gate walls correspondingly; and the lock wall, the side slope lining, the water retaining dam and the retaining wall form side walls of the water-saving pool. According to the water-saving pool and the lock chamber, the original space between canyon mountains is utilized as much as possible, the ship lock construction range can be formed only through slight excavation, the construction amount and the construction cost are reduced, the construction period is shortened, and the construction efficiency is improved.

The invention belongs to the technical field of bridge engineering, and particularly relates to a deepwater lock catch steel pipe pile cofferdam construction method which comprises the following steps: construction preparation: delimiting a steel pipe pile cofferdam area; drilling and groove milling are carried out along the steel pipe pile cofferdam area to form a cofferdam groove, and sandy soil is backfilled in the cofferdam groove; a guide device is lowered along the bored pile steel casing, and steel pipe piles are inserted one by one to form a steel pipe pile cofferdam; a plurality of inner supporting systems are assembled; a covering layer is excavated on the inner side of the steel pipe pile cofferdam to the designed elevation; underwater grouting is conducted on the inner sides and the outer sides of the steel pipe piles located in the cofferdam grooves; the multiple inner supporting systems are sequentially lowered to the designed elevation; a gap between each enclosing purlin structure and the steel pipe pile is checked; the bottom of the foundation pit is cleaned, water is pumped layer by layer, and concrete is poured between the enclosing purlin structure and the steel pipe piles till water pumping in the cofferdam is completed; the bearing platform / pier body is constructed, and backwater of the corresponding inner supporting systems is sequentially removed along with construction of the bearing platform / pier body till water flows out of the bearing platform / pier body; and dismantling the steel pipe pile cofferdam.

The invention discloses a combined cofferdam in the technical field of hydraulic engineering construction. The combined cofferdam comprises an upstream steel film end sealing cofferdam located on the upstream of a river channel and a downstream steel film end sealing cofferdam located on the downstream of the river channel. The diversion channel comprises a base formed by compaction treatment of original soil and local stones, double-row piles located on the side portion of the base, bamboo plywood laid on the surface layer of the double-row piles and the surface layer of the base and impermeable membrane cloth. A stilling pool is arranged in a downstream outlet area of the diversion channel; the ton bags are arranged at the bottom folding points and lap joints of the bamboo plywood and the impermeable membrane cloth and the downstream sides of the upstream steel membrane end sealing cofferdam and the downstream steel membrane end sealing cofferdam; through a brand new structural design, a combined cofferdam structural form is constructed, so that the safety and stability of the combined cofferdam under the conditions of large flow velocity and flow, large upstream and downstream height difference, special ground conditions and unfavorable geological conditions are remarkably improved.

The invention relates to the technical field of steel sheet pile cofferdams, in particular to a deep and long steel sheet pile cofferdam structure which comprises two steel pipe sets symmetrically distributed front and back, each steel pipe set is composed of a plurality of steel pipes linearly and evenly distributed, and a steel sheet pile is jointly connected between every two adjacent steel pipes. The deep and long steel sheet pile cofferdam structure further comprises a plurality of supporting mechanisms, and the supporting mechanisms are evenly distributed on the front sides and the rear sides of the two steel pipe sets. The sealing limiting parts and the supporting parts are alternately distributed and connected with each other, so that the multiple sealing limiting parts and the multiple supporting parts form a whole, two gaps with the same structure and adjacent positions are mutually complemented, force transmission can be conducted between the multiple sealing limiting parts and the multiple supporting parts, stress is uniform, and the sealing effect is good. And therefore, the overall supporting and limiting strength of the multiple sealing and limiting parts and the multiple supporting parts on the multiple steel pipes and the multiple steel sheet piles is improved, and the phenomenon that the single section of the cofferdam deforms is avoided.

The invention discloses a shared lock catch steel pipe pile cofferdam close to a bridge bearing platform under a high-speed railway line and a construction method, and the shared lock catch steel pipe pile cofferdam close to the bridge bearing platform under the high-speed railway line comprises a first lock catch steel pipe pile, a second lock catch steel pipe pile, a third lock catch steel pipe pile and a fourth lock catch steel pipe pile, the third lock catch steel pipe pile and the fourth lock catch steel pipe pile are connected with the first lock catch steel pipe pile and the second lock catch steel pipe pile. The lock catch steel pipe pile cofferdam is adopted to replace a double-wall steel cofferdam, the problems that the clear distance close to a bridge bearing platform is too small, and no space exists for independently arranging an overwater steel cofferdam are solved, and under the condition that two projects are both control projects and need to be constructed synchronously, a row of shared lock catch steel pipe piles are inserted in the middle to be used in the construction stage of the two bridge bearing platforms at the same time; an independent and separated cofferdam stress system is formed, the condition of synchronous construction of the two newly-built bridges is guaranteed, the using number of the steel pipe pile cofferdams is reduced, and material consumption is reduced.

The present invention relates to the technical field of water conservancy engineering, and specifically to a cofferdam for ship lock reconstruction and a construction method. A cofferdam for ship lock reconstruction comprises a concrete cofferdam body and a hollow concrete support structure. The concrete cofferdam body is closely attached to the walls on both sides of the ship lock and extends along the direction of water flow. The hollow concrete support structure is arranged between two adjacent concrete cofferdam bodies. The hollow concrete support structure is fixedly connected to the concrete cofferdam body by a connecting device. The hollow concrete support structure comprises a bottom layer, a hollow layer, and a top layer. Multiple rows of cavities arranged in parallel are formed inside the hollow layer. Blasting devices are equidistantly embedded in the concrete wall between two adjacent cavities. This application forms a stable water retaining barrier by placing the concrete cofferdam body close to the ship lock wall. The hollow layer design can reduce its own weight. In addition, the blasting device embedded in the support structure can achieve efficient and controllable demolition compared to traditional mechanical or manual demolition, which can greatly shorten the construction period.

The utility model discloses an embankment danger removal and reinforcement combined type movable cofferdam which comprises a cofferdam assembly I and a cofferdam assembly II, and is characterized in that hollow cavities are formed in the cofferdam assembly I and the cofferdam assembly II at the middle joints of notches; the hollow cavities in the first cofferdam assembly and the hollow cavities in the second cofferdam assembly are in a circular shape after being combined. The combined type movable cofferdam has the beneficial effects that by arranging a group of expansion type filling sealing structures consisting of the filling air bags, the air bag end parts, the connecting parts, the communicating pipes, the electronic barometers and the air pumps, when the combined type movable cofferdam is combined and connected or is used after being combined, when the cofferdam slightly vibrates or displaces accidentally, the cofferdam can be filled with the filling air bags; when the combined type movable cofferdam is in butt joint, the butt joint gap can be expanded, at the moment, the filling air bag is subjected to flexible deformation expansion under the action of internal stored air pressure, the expanded gap can be filled, the water blocking effect of the filling air bag is ensured, and the overall water blocking effect of the combined type movable cofferdam is more ideal.

The invention belongs to the technical field of bridge foundation construction fences and pier collision prevention, and particularly relates to a steel sheet pile and double-wall steel hanging box combined cofferdam and a construction method. A steel sheet pile and double-wall steel hanging box combined cofferdam comprises a double-wall steel boxed cofferdam, a steel sheet pile cofferdam and a pile foundation, the double-wall steel boxed cofferdam is installed above the pile foundation and comprises a steel boxed cofferdam bottom plate, a steel boxed cofferdam wall plate and a wall plate top reinforcing truss, bottom sealing concrete is arranged on the upper portion of the steel boxed cofferdam bottom plate, and the steel boxed cofferdam bottom plate is arranged on the steel boxed cofferdam wall plate. The steel sheet pile cofferdam comprises a Larsen type steel sheet pile, an outer waling, an inner waling and a waling bracket, a connecting device is arranged on the lower portion of the Larsen type steel sheet pile, and the Larsen type steel sheet pile is connected with the upper portion of the steel jacket box cofferdam wall plate through the connecting device. The steel sheet pile cofferdam and the double-wall steel jacket box cofferdam are connected through the connecting device, the steel sheet pile cofferdam serves as a water retaining structure and can be recycled and reused, the one-time steel investment of the double-wall steel cofferdam is reduced, and the construction cost of the cofferdam is greatly reduced.

The invention discloses a construction method of a multi-layer profile steel enclosing purlin in a steel pipe pile cofferdam, which comprises the following steps of: 1) respectively welding and fixing two ends of a main beam on the top surface of the cofferdam, and respectively completing the connection of a perforation jack, a finely-rolled twisted steel bar suspender, a limiting steel bar nut and the profile steel enclosing purlin at the bottommost layer; and (2) the plunger of the perforating jack falls back synchronously for multiple times, and the profile steel circuit purlin on the bottommost layer is driven to descend for multiple times through the finish-rolled twisted steel suspender till the profile steel circuit purlin on the bottommost layer descends in place and is welded and fixed to the lower portion of the cofferdam. And (3) multiple times of circulation are conducted, and positioning of multiple layers of profile steel enclosing purlins is completed one by one. The construction risk and the construction cost are greatly reduced, the profile steel enclosing purlins can be more conveniently positioned in the steel pipe pile cofferdam, and the safety of the steel pipe pile cofferdam is ensured. According to the method, the construction risk is remarkably reduced, the construction convenience is greatly improved, and the construction quality of the profile steel enclosing purlin can be checked more conveniently.

The invention relates to the technical field of Larsen steel sheet pile construction, and discloses a Larsen steel sheet pile cofferdam construction method suitable for a deepwater area, which comprises the following construction steps: 1) arranging a construction platform; (2) four positioning piles are driven into the construction position to form a construction area; 3) arranging a guide frame in the construction area, wherein the guide frame is provided with a guide arm; (4) a plurality of Larsen steel sheet piles are driven along the guide arms, the bottoms of the Larsen steel sheet piles extend into the solid soil layer, and adjacent Larsen steel sheet piles are arranged in a sealed mode; (5) enclosing purlins are arranged on the pile rows, and steel supports are arranged between the enclosing purlins to form an inner supporting structure; (6) water and sludge in the construction area are sucked till the solid soil layer is exposed at the bottom, and the Larsen steel sheet pile cofferdam is formed by the multiple Larsen steel sheet piles and the multiple inner supporting structures; the bottoms of the Larsen steel sheet piles extend to a solid soil layer and are arranged in a sealed mode, and a plurality of inner supporting structures are arranged, so that the water stopping performance of the cofferdam is improved, and meanwhile the stability and the water flow impact resistance are enhanced.

The utility model relates to the technical field of steel sheet pile cofferdams, in particular to a detachable cofferdam module for flood control engineering, which comprises a steel sheet pile structure, connecting buckle structures are fixed on two opposite side surfaces of the steel sheet pile structure, each connecting buckle structure comprises a first inserting buckle and a second inserting buckle, and a hollow area is arranged in a steel sheet pile. And a plurality of triangular support frame structures are fixed in the hollow area. The steel sheet pile solves the problems that two adjacent steel sheet piles in the prior art cannot be installed at a right angle or a smaller angle during installation, the structure is simple, and the steel sheet piles are easy to bend.