657 results about "Cofferdam" patented technology

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 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 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 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 invention discloses a dredged mud upper and lower part double-face combined vacuum consolidation drainage method, which comprises the following specific implementation processes: laying a horizontal sand bag containing a PVC (Polyvinyl Chloride) pipe and a vertical drainage pipe at the bottom of a cofferdam foundation pit to serve as a bottom drainage system, blowing and filling dredged mud in a layered manner, controlling the thickness and the water content of each layer, and when the water content of a soil body is lower than twice liquid limit, stopping drainage; starting the bottom vacuum water pumping device to perform preliminary water drainage, inserting straw bundles into the soil body through hollow pipes with bottom covers to form a vertical water drainage structure after the strength of the soil body meets the requirement, sequentially laying geotechnical cloth, a straw woven blanket, a PVC water drainage pipe network and a sealing film on the top to construct a top vacuum system, and finally synchronously starting the top vacuum water pumping device and the bottom vacuum water pumping device. The vacuum difference is controlled by adjusting the ventilation device, and upper and lower double-face combined vacuum consolidation drainage is achieved. The drainage consolidation of the dredged mud is effectively accelerated, the treatment efficiency is improved, and the drainage effect is enhanced through precise control over the vacuum degree and application of materials such as straw.

The invention relates to a water and land construction rapid filling method suitable for a cofferdam with cohesive soil at a soil taking point. The water and land construction rapid filling method comprises the following steps of A, underwater throwing filling, B, overwater turning filling and C, land filling of a dam core. Water throwing and land throwing are combined, cofferdam forming is accelerated, inland river conventional equipment is adopted for overwater construction, construction organization is facilitated, adopted dredgers are backhoe dredgers and grab dredgers which are commonly used for earth cutting in inland rivers, and the ships are shallow in draught, convenient to transport in the inland rivers, free of weather influence, capable of working continuously, capable of saving the construction period, capable of reducing soil disturbance and convenient to throw and fill water. The overall stability of the cofferdam can be improved, earthwork balance is achieved, cost is saved, environment friendliness is achieved, and good social and economic benefits are achieved.

The invention relates to the technical field of engineering construction optimization, in particular to a cofferdam filling construction scheme optimization method and system.The method comprises the following steps that cofferdam filling construction partitions are divided along the axis of a cofferdam, and a three-dimensional coupling numerical model is established based on hydrogeological parameters and engineering design parameters of the cofferdam filling construction partitions; performing transient seepage stability analysis on the cofferdam filling construction subarea to obtain a critical filling rate; in combination with the critical filling rate, a partition construction collaborative model is established based on a core engineering target, so that a cofferdam filling construction initial scheme is generated; the cofferdam filling construction initial scheme is executed, cofferdam filling state parameters are monitored, and construction risk early warning information is obtained; and dynamically adjusting the cofferdam filling construction initial scheme according to the construction risk early warning information to obtain a cofferdam filling construction optimization scheme. According to the method, the cofferdam filling construction scheme is dynamically optimized, and the safety, the high efficiency and the intelligent level of cofferdam filling construction are improved.

The invention relates to the technical field of bridge construction safety monitoring, discloses a bridge cofferdam construction safety evaluation system and method based on data real-time analysis, and solves the problems of scattered and heterogeneous monitoring data, inaccurate safety state prediction and long risk response time in the prior art. Specifically, multi-dimensional physical parameters of the cofferdam structure and the surrounding environment of the cofferdam structure are collected in real time through a multi-source sensor network; carrying out preprocessing and space-time alignment on the collected original data; inputting the preprocessed fusion data into a dynamic risk assessment model integrated with a random forest and a long-short-term memory network, and predicting a safety state evolution trend of the cofferdam structure in a future time period; and generating graded early warning information and disposal suggestions according to the prediction result, and pushing the information and suggestions to the site construction terminal. According to the technical scheme, fusion and space-time registration of monitoring data are realized, the perspectiveness and accuracy of safety state prediction are improved, the risk response time is shortened, and the intelligent level of engineering management is improved.

The invention discloses a curing agent for curing and damming solid waste and a layer-by-layer cofferdam damming process, and relates to the technical field of damming filler devices. The curing agent is characterized in that a guide and discharge device with a guide and regulation effect is arranged on the front side of a preparation device; a reclaimed water device with filtering and flow guiding functions is arranged on the side face of the preparation device, and the industrial solid waste environment-friendly treatment, solidification and accumulation technology is adopted, so that equipment machining automation is achieved; according to the process of stirring industrial solid waste and reclaimed water according to a ratio, adding a curing agent according to a classified ratio of the industrial solid waste, conveying by a pipeline, curing and building a weir, repairing a pool on a pool, forming a central emergency pool, stacking and storing, and greening the solid, the dust pollution after stacking is reduced, the storage capacity can be increased, the service life is prolonged, and the environmental pollution is reduced. The effect after layered solidification and accumulation is similar to that of a terraced field, vegetation greening is carried out after soil covering, and the industry is recovered and improved step by step.

The utility model discloses an annular downflow weir vertical shaft spillway structure with a trapezoid cofferdam, which comprises an annular downflow weir, a vertical shaft connected to the bottom of the inner side of the annular downflow weir, a round-to-square section connected to the bottom of the vertical shaft, a stilling well connected to the bottom of the round-to-square section, a discharge hole arranged on the side surface of the stilling well, and a pressure slope connected to the discharge hole on the side surface of the stilling well. And the pressure slope structure further comprises a trapezoidal cofferdam, and the trapezoidal cofferdam is arranged on the periphery of the side wall of the annular overflow weir. The annular downflow weir vertical shaft spillway structure with the trapezoidal cofferdam solves the problem that due to the fact that a traditional annular downflow weir vertical shaft spillway tunnel is affected by asymmetric terrains, the flow state of water flow entering a vertical shaft is not uniform, and the phenomenon of water flow bias in the vertical shaft is serious.

The embodiment of the invention discloses a ship bilge keel system and a ship. The bilge keel system comprises a bilge keel cabin, a bilge keel body, a hydraulic automatic control unit, a hydraulic jack set, a connecting toggle plate, a rotating shaft and a sealing limiting unit. The bilge keel cabin is arranged at the joint of a ship bottom plate and a broadside, a bilge keel body is of a triangular prism-shaped structure defined by three rows of coamings and is provided with a first limiting connecting piece and a second limiting connecting piece, and the broadside coaming is in an arc shape along a broadside outer plate and corresponds to an opening of the bilge keel in shape. One side of the side coaming is hinged to a bilge keel opening through a rotary hinge, and the hydraulic automatic control unit can control the hydraulic jack set to stretch out and draw back so as to drive the bilge keel body to rotate along the rotary hinge through the rotary shaft, so that the first limiting connecting piece or the second limiting connecting piece is in matched sealing connection with the sealing limiting unit. The retractable design of the bilge keel is achieved, and the sailing resistance is reduced by recovering the bilge keel.

The invention discloses a barrel type cofferdam for open sea deepwater island building foundation construction. The barrel type cofferdam comprises a plurality of standard concrete units and blocking steel plates, wherein the standard concrete units and the blocking steel plates are used for forming the cofferdam in a surrounding mode. Each standard concrete unit comprises a barrel type foundation, a plurality of prefabricated heightening sections and a plurality of concrete connecting columns; the barrel type foundation comprises a foundation barrel body with a circular waist-shaped plane and an upper barrel body; a plurality of concrete pipes are uniformly reserved in the barrel type foundation; a plurality of prefabricated heightening sections are sequentially stacked on the top face of an upper barrel of the barrel type foundation in the mode that female spigots and male spigots are meshed with each other, so that concrete pipes in the upper prefabricated heightening sections are aligned with concrete pipes in the lower prefabricated heightening sections one by one, and a concrete full-length pipe is formed. The plurality of concrete connecting columns are arranged in the plurality of concrete through long pipes; the blocking steel plates are fixed between the upper cylinder bodies of the two adjacent standard concrete units and the inner side faces and the outer side faces of the prefabricated heightening sections. Overall stress of the cofferdam and the seabed foundation can be achieved, and lateral stress can be resisted.

The utility model relates to an anti-overturning structure of a steel cofferdam, the steel cofferdam comprises cofferdam piles, enclosing purlins are arranged on the inner walls of the cofferdam piles, anti-overturning piles are inserted into the inner sides and the outer sides of a plurality of cofferdam piles at certain intervals, and the insertion depth of the anti-overturning piles is larger than that of the cofferdam piles. The upper ends of the anti-overturning piles are higher than the top elevation of the cofferdam pile, the anti-overturning piles on the inner side are tightly attached to surrounding purlins on the inner wall of the cofferdam pile, a certain distance is formed between the anti-overturning piles on the outer side and the cofferdam pile, and the upper ends of the two opposite anti-overturning piles on the inner side and the outer side of the cofferdam pile are tensioned through a pull rod. The whole anti-overturning performance of the cofferdam can be guaranteed under the condition that the cofferdam piles cannot reach the designed buried depth.

The utility model discloses a cofferdam device for water conservancy construction, which relates to the technical field of water conservancy construction and comprises two first baffles and second baffles arranged on the two sides of the two first baffles, positioning pins are symmetrically arranged on the two sides of the first baffles, one side of each second baffle is provided with a positioning groove clamped with the corresponding positioning pin, and the positioning grooves are matched with the positioning pins. Reinforcing mechanisms are arranged on the inner sides of the first baffle and the second baffle and comprise reinforcing frames installed on the inner sides of the first baffle and the second baffle, reinforcing frames are arranged on the inner sides of the reinforcing frames, and stabilizing rods are symmetrically arranged on the lower surfaces of the first baffle and the second baffle correspondingly. And positioning holes are symmetrically formed in the upper surfaces of the first baffle and the second baffle. Connection between the first baffle and the second baffle can be reinforced through the reinforcing frame in the reinforcing mechanism, the strength between the first baffle and the second baffle can be improved through the reinforcing frame, and the service life of the first baffle and the service life of the second baffle are prolonged.

The utility model provides a tubular pile cofferdam construction water stop test device, which relates to the technical field of tubular pile cofferdam construction, and comprises a test box, a soil table and a plurality of tubular piles, and two groups of mortise lock structures are respectively arranged on the peripheral surface of each tubular pile; every two adjacent pipe piles are connected together through a mortise lock assembly, and each mortise lock assembly comprises a set of mortise lock structures arranged on one pipe pile and a set of mortise lock structures arranged on the other pipe pile, and each mortise lock structure comprises a female lock catch and a first insertion block; the mortise lock structure is arranged on the other pipe pile and comprises a sub lock catch and a second insertion block; the interlocking assembly comprises a bolt, a nut and two insertion plates; one insertion plate is inserted into the first insertion block; the other insertion plate is inserted into the second insertion block; a bolt penetrates through the two insertion plates and then is locked by a nut; and under the constraint of the bolts, the two inserting plates are bent and buckled to form a pouring space. The pipe pile cofferdam water stop test device solves the problems that in the prior art, a pipe pile cofferdam water stop test is inconvenient to operate, a pipe pile is inconvenient to pull out under the action of slurry solidification after the test is completed, and the test efficiency is affected.

This utility model provides a prefabricated cofferdam for soft soil foundations, relating to water conservancy engineering and cofferdam technology. The prefabricated cofferdam includes multiple cofferdam units arranged and connected sequentially along a first direction. Each cofferdam unit includes a first water-retaining component, a second water-retaining component, and water-retaining filler. The first water-retaining component is vertically inserted into the foundation, with its first side serving as the construction area. The second water-retaining component includes a horizontal portion and a vertical portion. The horizontal portion is located on the second side of the first water-retaining component, laid on the foundation surface, and abuts against the first water-retaining component. The vertical portion extends upwards from the horizontal portion beyond the water surface, enclosing a receiving space together with the horizontal portion and the first water-retaining component. The water-retaining filler fills the receiving space, effectively preventing water from seeping into the construction area.

This utility model provides a miniature cofferdam cover for pile foundations. The miniature cofferdam cover includes: a pile foundation, an outer shell comprising at least two outer shell segments detachably connected around the pile foundation, and a water-stop membrane, in the form of a strip, surrounding the pile foundation with its bottom end lower than the bottom of the outer shell. A fixing clip is provided on the outer shell segment, comprising a threaded rod and a fixed end movably connected to the threaded rod. The fixed end moves towards the pile foundation under the push of the threaded rod. Connection holes and water-stop strips are provided at the edges of the outer shell segment. By using the outer shell segments to surround the pile foundation, the pile foundation is isolated from the surrounding water, providing space for water-based operations. The water-stop membrane isolates water at the contact point between the outer shell and the pile foundation, preventing external water from flowing into the outer shell from the connection point. The multi-segment connection method of the outer shell segments facilitates the transportation and installation of the outer shell. Furthermore, the structure of the outer shell, which can be completed in two segments, has fewer structural components, is easy to assemble, and saves on cofferdam costs.

The utility model discloses an assembly type cofferdam, relates to the technical field of cofferdams, and aims to solve the problems that when silt is poured between two metal baffles, a large amount of dust is raised by the silt, the surrounding environment of a river channel is influenced, and the environmental protection effect is influenced. According to the technical scheme, the device is characterized by comprising a plurality of guide columns and baffles spliced with each other, the guide columns and the baffles are detachably connected, a plurality of supporting rods are detachably connected to the guide columns, a working platform is detachably connected to the supporting rods, cavities are formed in the baffles, water conveying pipes are fixedly connected into the cavities, and one ends of the water conveying pipes penetrate through the baffles to the outside. When the cofferdam is constructed, river water can be poured into the cavity through the baffle and the cavity in the baffle, so that the weight of the baffle is increased, the stability of the baffle is improved, the baffle is prevented from being washed away by a riverway, the river water is poured into the baffle, a large amount of dust cannot be generated, the surrounding environment of the riverway is prevented from being influenced, and the environmental protection effect is improved.

The utility model belongs to the water conservancy cofferdam technical field especially relates to a water conservancy cofferdam construction is with water retaining device, include: the enclosure one, the enclosure one upper end detachable installation enclosure two, the enclosure one inner chamber lower end detachable installation chassis, install annular sealing air bag on the chassis, annular sealing air bag is connected with outside gas source, annular sealing air bag fills in outside gas source and is used for sealing the gap between chassis and enclosure one after, the enclosure one outer wall fixed fixed plate no.

A water conservancy and hydropower cofferdam construction device comprises a U-shaped baffle, an L-shaped angle plate, a corner sleeve plate, a horizontal inserting pipe, a horizontal sliding rod, an inserting pipe side plate, a spring and a vertical hanging plate, the U-shaped baffle is provided with a U-shaped baffle side groove, the side face of the U-shaped baffle is provided with baffle side inserting strips, the baffle side inserting strips are symmetrically arranged at the two ends of the U-shaped baffle, and the baffle side inserting strips are matched with the U-shaped baffle side groove; the baffle side inserting strips are inserted into the U-shaped baffle side grooves, the adjacent U-shaped baffles are opposite in direction, the U-shaped baffles are sequentially connected and form a horizontal baffle, the side face of the L-shaped angle plate is provided with angle plate side inserting strips, the angle plate side inserting strips are matched with the U-shaped baffle side grooves, the angle plate side inserting strips are inserted into the U-shaped baffle side grooves, and the upper surfaces and the lower surfaces of the U-shaped baffles and the L-shaped angle plate are all aligned.

The utility model discloses a concrete longitudinal cofferdam structure capable of reducing the height of a closure embankment, which comprises a concrete longitudinal cofferdam, a drainage channel, a blocking gate, a blocking body, a main dam and the closure embankment, the drainage channel is arranged on the lower portion of the concrete longitudinal cofferdam and close to the main dam, the drainage channel penetrates through the concrete longitudinal cofferdam, and a fall is formed between the inlet end and the outlet end of the drainage channel; the blocking gate is arranged on the upstream side of the water inlet of the drainage channel; the plugging body is arranged in the concrete longitudinal cofferdam; the main dam and the closure embankment are located at the two ends of the concrete longitudinal cofferdam. Due to the fact that the drainage channel is additionally arranged on the concrete longitudinal cofferdam, water from the upstream flows out of the drainage channel during closure, and on the premise that closure requirements are met, the height of the embankment and closure difficulty are reduced, the closure construction period is shortened, and the closure investment is saved.

The invention discloses a construction method for dislocation correction of a retaining wall, the retaining wall comprises a wall body, a bottom plate and an antiskid tenon, the wall body is arranged on the bottom plate, the bottom plate is arranged on a horizontal base, the bottom plate comprises a wall toe plate and a wall heel plate which are integrally formed, the antiskid tenon is arranged at the bottom of the wall heel plate of the bottom plate and is arranged in the base, and the antiskid tenon is arranged on the bottom of the wall heel plate of the bottom plate. An expansion joint is formed at the joint of the retaining wall section I and the retaining wall section II which are constructed in sections; comprising the following construction steps: step 1, construction preparation; secondly, earth excavation is conducted on the soil body at the position of the staggered retaining wall; thirdly, cofferdam water pumping is conducted in the construction section area; fourthly, a limiting plate I section is poured; fifthly, a hydraulic jack is installed, and the staggered retaining wall is jacked back by the hydraulic jack; sixthly, the hydraulic jack is dismantled, and a limiting plate section II is poured; and seventhly, earthwork is backfilled, and the cofferdam is cleaned. According to the construction method, the staggered canal retaining wall can be corrected, and therefore the structural stability and functionality of the retaining wall are guaranteed.

The utility model discloses a pipe pile and sheet pile combined wading retaining structure which comprises a prestressed pipe pile, a launching ramp, an upstream face pipe pile, a straining beam and a steel sheet pile. The multiple prestressed pipe piles are evenly distributed at equal intervals and directly penetrate into a soil body bearing layer along the bank of a water area or sequentially penetrate into a water body, a soil layer and the soil body bearing layer in the water area. The launching ramp is laid at the top ends of the prestressed pipe piles, the upstream face pipe piles and the steel sheet piles are arranged on the outer side of the lower position of the launching ramp and sequentially penetrate into a water body, a soil layer and a soil body bearing layer in a water area, and the straining beams are installed at the top ends of the upstream face pipe piles and the steel sheet piles. The foundation structure of the launching ramp is compact in structure, the foundation structure of the launching ramp is constructed in the mode that the pipe piles and the sheet piles are combined, the launching ramp can be supported and protected, cofferdam drainage construction is not needed, the construction work amount, the construction period and the construction cost of the whole structure are greatly reduced, the structure is stable, and reliability is good.

The invention provides a steel sheet pile cofferdam structure, which belongs to the field of cofferdam buildings, and comprises a plurality of steel sheet pile bodies which can be spliced with one another; the multiple steel sheet pile bodies are driven into the deep bottom of a river channel through a pile driver, and every two adjacent steel sheet pile bodies are connected in an inserted mode. The multiple steel sheet pile bodies are matched with the corner pieces to jointly define a rectangular cofferdam. The corner pieces are located at the four corners of the rectangular cofferdam. A plurality of rectangular enclosing purlin assemblies which are arranged from top to bottom are arranged on the inner wall of the rectangular cofferdam, a plurality of supporting assemblies are evenly arranged in the enclosing purlin assemblies, and the supporting assemblies abut against and are matched with the inner wall of the rectangular cofferdam; the supporting assemblies in one-to-one correspondence in the enclosing purlin assemblies from top to bottom are jointly and fixedly connected through cooperation of bolt rods and nuts. By means of the three-point supporting design, the adjustable assembly and the modular linkage structure, the problems of insufficient supporting strength, poor deformation adaptability and overall stability of the deep excavation cofferdam are solved in a targeted mode, and the construction safety and the structural reliability are remarkably improved.

The present application relates to the technical field of hydraulic engineering, and more particularly to a seepage control system for earth-rock cofferdams. The present application periodically collects external hydro-meteorological data and internal structural response data of the cofferdam through sensors based on a monitoring unit; a multi-field coupling model is established based on the finite element method through a model construction unit, dynamically coupling wave load, tidal level and seepage pressure field; the minimum cofferdam top elevation is determined by comparing the difference between the minimum safety factor and the preset safety factor based on a decision unit; and the minimum cofferdam top elevation is input into the multi-field coupling model based on an analysis unit to obtain the maximum value of the hydraulic slope of the backwater slope escape point within a third preset time period, the seepage state is determined based on the maximum value, and the related parameters are adjusted based on the seepage state. The present application reduces the leakage rate of earth-rock cofferdams through real-time monitoring, prediction and active control of cofferdam seepage risk.

The present application relates to a kind of for locking steel pipe pile cofferdam water stop pressure grouting device, including a support frame, pressure grouting pipe, annular air bag and inflation pipe;The support frame includes upper support plate and lower support plate, there is a certain interval between upper support plate and lower support plate and welding connecting rod, multiple buckles are arranged in equidistance rotation on the edge of upper support plate, and the lower end of buckle is located below upper support plate and is inclined to the outside of upper support plate upwards;Pressure grouting pipe vertically penetrates upper support plate and lower support plate;Annular air bag is located between the upper support plate and lower support plate of support frame, annular air bag can extrude the lower end of buckle to rotate to the outside of upper support plate in inflation state, and its annular outside surface protrudes to the outside of upper support plate and lower support plate;Inflation pipe penetrates upper support plate and inflates and deflates air bag.The present application can be combined with rock by the way of high-pressure grouting to press cement slurry from inside steel pipe pile to outside steel pipe pile, so that steel pipe pile is closely combined with rock, and the water stop effect of steel pipe pile cofferdam is improved.

The invention relates to the technical field of steel cofferdams, in particular to an assembled civil engineering bearing platform construction steel cofferdam which comprises a steel coaming, and a first locking mechanism which is used for being spliced with the outer wall of the other side of the top of another steel coaming during assembly and can rotate is arranged on the outer wall of one side of the top of the steel coaming; one side end of the steel coaming is provided with a second locking mechanism used for being spliced with the other side end of the other steel coaming and shielding the sealing connection gap. According to the steel cofferdam, the manufacturing cost can be remarkably reduced, the construction period is shortened, the locking process is rapid and stable, meanwhile, seamless connection of the steel coaming at the corner is achieved, the steel cofferdam can adapt to various construction environments and requirements, and the construction efficiency of the assembled bridge bearing platform construction steel cofferdam is improved.

The H-shaped steel and Larsen steel sheet pile combined cofferdam is reliable in connection, easy and convenient to construct and high in construction safety. The connecting structure comprises Larsen steel sheet piles, split bolts and a steel waist beam, the Larsen steel sheet piles are arranged on the two sides of the cofferdam, and the Larsen steel sheet piles on the same side are sequentially connected together. The steel waist beams are arranged on the two sides of the cofferdam and fixedly installed on the upper portions of the Larsen steel sheet piles, and the row of Larsen steel sheet piles on the same side are connected in series and fixed together. The split bolts are connected with the steel waist beams, and the steel waist beams on the two sides are fixed together. The device is characterized by further comprising a TC lock catch and H-shaped steel, the H-shaped steel is vertically arranged on the two sides of the cofferdam, the upper portion of the H-shaped steel is installed on the steel waist beam through the TC lock catch, and the bottom of the H-shaped steel extends downwards and exceeds the bottom of the Larsen steel sheet pile 1.

The application relates to the technical field of cofferdam structures, in particular to a bridge pier construction cofferdam structure which comprises a guide base and a cutting; further comprising a guide assembly which comprises a first guide module and a second guide module, the first guide module comprises fixing seats arranged on both sides of the guide base, and a sliding groove is arranged on the fixing seat, a sliding block is movably arranged in the sliding groove, and a guide frame is fixedly arranged on the sliding block; the guide assembly can smoothly fix the guide base on a riverbed, then a water under motor is started to drive the rotating shaft to rotate, the reel tightens the steel cable, the expanding part expands to the riverbed, the stability of the cutting is improved, the first guide module is fixed on the upper end of the arc-shaped rack before this, when the rotating shaft rotates, the end of the guide wheel is in the same horizontal plane with the inner arc surface of the guide base, the guide wheel positions the outer arc surface of the steel pile, the guide and the anti-deviation are completed by cooperating with the fixed cage, and the steel pile smoothly penetrates into the bedrock layer.