693 results about "Caisson" patented technology

The invention provides an open caisson sinking control method based on dynamic balance of a soil resistance field, which comprises the following steps of: judging whether an open caisson posture dynamic balance condition is met or not according to an open caisson bottom surface soil resistance vector field and an open caisson posture offset, if not, intervening space distribution of the open caisson bottom surface soil resistance vector field, and reconstructing the open caisson bottom surface soil resistance vector field; the dynamic balance condition of the open caisson posture is met; and based on the open caisson bottom surface soil resistance vector field, the height difference vectors of the adjacent bins on the open caisson bottom surface and the soil taking control matrix, a dynamic decision objective function is constructed, the objective function is solved, an optimal soil taking control matrix is obtained, and an actuator cluster is controlled to take soil from the bins on the open caisson bottom surface. According to the method, the influence of dynamic evolution of the soil resistance field of the bottom face of the open caisson on the open caisson attitude offset is considered, the soil resistance field is dynamically adjusted, the open caisson attitude is accurately controlled, and soil taking control is optimized.

The invention relates to the technical field of tunnel engineering prefabricated part production, in particular to a large-diameter duct piece independent kiln assembly line conveying prefabricating method and system. S2, a reinforcement cage and an embedded part are installed; s3, concrete is precisely poured and vibrated; s4, pre-curing and surface treatment; s5, carrying out roller way type flow conveying; s6, hydration heat-driven dynamic maintenance is carried out; and S7, demolding and finished product detection. And S8, mold circulation. According to the large-diameter duct piece prefabricating production line, through technical innovation in multiple aspects of mold, conveying, maintenance, control and the like, the core technical problem in existing large-diameter duct piece prefabricating production is solved, high-precision, high-efficiency, low-energy-consumption and green production of large-diameter duct pieces is achieved, and the large-diameter duct piece prefabricating production line has remarkable technical advantages and wide application prospects and is suitable for large-diameter duct piece prefabricating production. The method can be widely applied to infrastructure construction projects such as shield tunnels, open caisson projects and underground comprehensive pipe galleries.

The invention relates to the technical field of coastal zone renovation and repair, in particular to a siltation promotion device for coastal zone renovation and repair, which comprises a siltation promotion assembly and a caisson which are sequentially arranged from top to bottom, the siltation promotion assembly comprises a plurality of siltation promotion modules which are connected through side edges, and the top side of the siltation promotion assembly is used for being fixedly connected with a coast; each siltation promotion module comprises a frame and a plurality of anti-flow plates, the multiple anti-flow plates are sequentially arranged in the frame from top to bottom, the two ends of each anti-flow plate are rotationally connected with the two opposite sides of the frame correspondingly, and every two adjacent siltation promotion modules are rotationally connected through one side edge of the frame; a sedimentation cavity is formed in the top of the caisson, a permeable material is arranged in the sedimentation cavity, flow guide holes penetrating through the two sides are formed in the upstream face and the downstream face of the caisson correspondingly, and the bottom side of the siltation promotion module is connected with the caisson and located above the sedimentation cavity; the siltation promotion device is formed in a splicing mode, the siltation promotion device can be well suitable for complex terrains, and the anti-flow plate is arranged to effectively resist water flow impact.

To stably press a caisson in.SOLUTION: A cylindrical press-in type open caisson extending in the up-down direction includes a cutting edge provided at the lower end of the press-in caisson, a friction cut section provided on the entire outer surface of the press-in caisson at a predetermined height from the lower end and at a predetermined thickness from the outer surface outward, and multiple plate-shaped protrusion sections provided at predetermined intervals in the circumferential direction of the outer surface, at a predetermined width in the circumferential direction of the outer surface, at a predetermined height from the upper end of the friction cut section, and with a thickness less than the thickness of the friction cut section.SELECTED DRAWING: Figure 3

The invention relates to the field of geotechnical engineering construction, in particular to a deep and large open caisson resistance reducing and sinking assisting system and a cooperative control method, and the system comprises a stratum information base which stores stratum information corresponding to each well wall subarea; the attitude monitoring module is used for acquiring control point coordinates, control point elevation, deflection amount, well bottom elevation, water level in the well, surrounding stratum, sinking speed and blade foot resistance of the open caisson in real time; the thixotropic slurry drag reduction module can independently control the slurry viscosity of each well wall subarea; the high-pressure jet flow sinking assisting module can independently control the jet pressure of each well wall subarea; and the counterweight adjusting module can adjust the counterweight loading amount. According to the method, self-weight sinking, thixotropic slurry drag reduction, high-pressure jet flow sinking assistance and counterweight sinking assistance are covered, cooperative control over all drag reduction sinking assistance systems can be achieved, the construction efficiency of the deep and large open caisson penetrating through the hard soil layer can be greatly improved, the problems that the open caisson construction geological adaptability is poor, multi-system cooperation is difficult, and the accident rate is high are solved, and the construction quality is improved.

A permanent-temporary combined square block and caisson combined gravity type wharf comprises a land area rear storage yard, a temporary prefabricating yard used for prefabricating square blocks and caissons is arranged on the land area rear storage yard, the temporary prefabricating yard is communicated with square block structural sections through caisson shipping channels, and the square block structural sections are arranged along the coast and serve as caisson temporary shipping wharfs. The caisson shipping channel is used for transporting prefabricated square blocks and caissons; and after the caisson is transported out through the caisson shipping channel and the square structure section, the caisson is arranged to be connected with the square structure section into a whole, and the caisson structure section wharf is formed. According to the wharf, a site does not need to be additionally found to serve as a prefabrication yard and a temporary wharf as a construction site, and the temporary shipping wharf and part of the prefabrication yard are combined permanently and temporarily, so that wharf construction and dismantling cost can be saved.

The invention discloses an open caisson sinking construction control method and system based on accurate sinking resistance detection. The open caisson sinking construction control method comprises the steps that an end resistance monitoring device and a side friction resistance monitoring device are pre-buried in an open caisson structure; in the sinking process of the open caisson, end resistance and side friction resistance data are collected; the data processing center dynamically calculates the real-time proportion of the end resistance and the total side friction resistance in the sinking total resistance, and analyzes the spatial distribution characteristics of the real-time proportion; based on the real-time proportion and the spatial distribution characteristics, the sinking state of the open caisson is intelligently judged, and the sinking state at least comprises normal sinking, end resistance type sinking difficulty, side resistance type sinking difficulty, inclination risk and sudden sinking risk; and according to the intelligently judged sinking state, a targeted control instruction is generated and output so as to control a sinking assisting system deployed on the open caisson to execute partitioned and graded resistance reduction or stable sinking operation. Real-time sensing, intelligent diagnosis and accurate active control of the sinking process of the open caisson are achieved, and the construction safety, efficiency and engineering quality are effectively improved.

The utility model provides a supporting cushion device for a steel open caisson in a deepwater environment. The supporting cushion device comprises a grouting capsule and a capsule flange, the capsule flange is connected between the open caisson and the grouting capsule; a connecting bolt hole, an internal thread grouting hole and an internal thread vent hole are formed in the side, facing the capsule flange, of the grouting capsule. The grouting pipe and the breather pipe respectively penetrate through the open caisson and the capsule flange and then are connected with the internal thread grouting hole and the internal thread air hole; the side, away from the grouting capsule, of the grouting pipe is connected with a grouting machine. And the grouting capsule is fixedly connected with the capsule flange through the connecting bolt hole.

The invention discloses an assembly type ocean suction type caisson foundation structure and a construction method thereof, and belongs to the field of caissons, the assembly type ocean suction type caisson foundation structure mainly comprises a caisson assembly, the caisson assembly comprises a plurality of sets of assembly type caisson bodies, reinforcing steel bars are fixedly installed in the caisson bodies, open holes are formed in the caisson bodies, oblique openings are formed in the bottoms of the caisson bodies, and the caisson bodies are fixedly installed in the open holes. According to the fabricated ocean suction type caisson foundation structure and the construction method thereof, the bionic plates and the caisson body can enter the sea together, so that the holes can make contact with seawater, and therefore the bionic plates simulate the reef environment through the holes; according to the caisson, a habitat is provided for marine organisms, a food chain is constructed, an ecological chain is repaired, biological diversity is improved, wave force can be weakened, base scouring can be reduced, structural fatigue damage can be reduced in engineering, meanwhile, a protective layer is formed through biological attachment, and caisson durability is improved.

The invention relates to a caisson transferring system and method, and belongs to the technical field of caisson transportation. According to the caisson transferring method, a capsule trolley, a pushing oil cylinder, a rail, a rail clamping device, an electric water pump, a hydraulic pump station, an electric oil pump and a controller are included; the capsule trolley is used for bearing the caisson; the pushing oil cylinder is connected to the capsule trolley and used for driving the capsule trolley to move. The track is laid in a groove in the ground; the rail clamping device is used for clamping a rail; the electric water pump is used for injecting water into capsules of the capsule trolley; the hydraulic pump station is used for supplying oil to the pushing oil cylinder and a clamping oil cylinder of the rail clamping device; the electric oil pump is used for driving a sliding block on the capsule trolley to move so as to lift the height of the sliding block; the controller is used for controlling the electric water pump and the electric oil pump to work. According to the caisson moving and transporting system and method, the controller is used for controlling the working process of the rail clamping device, the capsule trolley and the pushing oil cylinder, so that automatic moving and transporting of the caisson are achieved.

The invention relates to a breakwater structure for wave power generation and a construction method of the breakwater structure. The breakwater structure comprises a lower barrel body, an upper caisson and a power generation device. A compartment is arranged in the upper caisson, and the power generation device is installed in the compartment. A wave inlet hole is formed in the wave facing side of the upper caisson, a cast-in-place adjusting node is arranged on the top of the upper caisson, and a wave wall, a cable pipe trench, a detachable road plate and an overhauling device are sequentially arranged above the node. The breakwater structure and the wave power generation system are integrated by adopting standard barrel type foundation factory prefabrication and floating transportation installation and combining cast-in-place joint leveling and the detachable road plates. The structure has the advantages of being convenient to construct, controllable in cost, stable in structure, convenient to maintain and the like, is suitable for wave power generation under medium and small wave conditions, and is particularly suitable for green power supply and coast protection in areas such as ports and islands.

The invention provides a pipe jacking working well construction method for soft clay geology. The pipe jacking working well construction method comprises the steps that S1, replacement filling and cushion layer construction are conducted in a construction area corresponding to a working well; s2, a formwork is erected for blade foot pouring, S3, excavation is conducted from the middle of the open caisson to the periphery in a layered mode, the open caisson is filled with backfill sand for back pressure after final sinking, and well wall heightening is conducted after backfill; s4, after the backfill sand is cleaned, sinking and heightening are carried out for multiple times until excavation is carried out to a preset elevation; s5, riprapping and leveling the well bottom, and then moving from the well edge to the middle for layered pouring to form a back cover; and S6, after water pumping is completed, reinforcing steel bars are bound, concrete is poured, and a bottom plate is formed. The mode that symmetrical excavation is conducted and soil bodies are reserved along the periphery of a blade foot to form a soil embankment is adopted, the well wall evenly sinks under the action of self weight, and the problems that the well wall inclines and cracks are caused by uneven sinking are avoided.

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 invention discloses delayed coagulation type super-early-strength quick-hardening mortar and a preparation method thereof, and relates to the technical field of building materials, a shell-core structure targeted modified early strength agent is designed, a staged dry-wet mixing technology is adopted, seabed in-situ curing is combined, cooperation of mortar delayed coagulation construction and super-early-strength development is achieved, and the construction efficiency is improved. According to the present invention, with the design of the targeted modified early strength agent, the surface delayed coagulation shell and the core early strength core structure are formed through the grafting reaction of the sodium nitrite and the hydroxyl carboxylic acid monomer, and the 15-25% accurate grafting rate control is matched, such that the antagonism problem of the traditional early strength agent and the delayed coagulation agent can be solved, and the deep sea open caisson grouting temporary support requirement can be met; in the deep sea environment, the delayed coagulation shell can guarantee a construction window of 75-105 min, the requirement for long-distance grouting of the seabed is met, deep sea high pressure can trigger the delayed coagulation shell to be broken, the core early strength core rapidly activates cement to be hydrated, and the mortar can rapidly form the requirement for rapid bearing of the open caisson temporary support with enough strength.

The invention relates to the technical field of open caisson construction, in particular to an open caisson construction method suitable for a soft soil foundation, which comprises the following steps: excavating a foundation pit, pre-reinforcing the foundation, constructing a cushion layer, manufacturing an open caisson in sections, arranging a monitoring system, sinking in stages and partial pressure, dynamically adjusting hydraulic jacking force and finally sinking and sealing bottom. Wherein dynamic adjustment of hydraulic jacking force is realized through arrangement of a monitoring system, which is a main invention point of the invention, during sinking, data is fed back through a tilt angle sensor, a laser displacement meter and an earth pressure sensor, the jacking force is corrected according to a formula, and dynamic correction and emergency control are combined; accurate and intelligent control of open caisson construction is achieved, and the safety, efficiency and quality of soft soil foundation open caisson construction are improved.

The invention provides a side pressure simulation test device and test method in the sinking process of an open caisson, and relates to the technical field of civil engineering, and the test device comprises a centrifugal device, a test model and a sinking soil sampling device. The centrifugal device is composed of a driving source, a rotating arm and a hanging basket, the hanging basket fixes the test box, an upper cavity and a lower cavity are formed in the test box, the upper cavity is filled with test soil, the open caisson model is placed in the test soil, and detection elements are arranged on the inner wall and the outer wall. The vertical shaft penetrates through the soil body and is connected with the open caisson inner cavity and the lower cavity. The sinking soil taking device drives the vertical shaft to move downwards through the pressing assembly, and the soil taking assembly cuts and discharges soil through a soil cutter. Through centrifugal acceleration, dynamic excavation and lateral pressure monitoring, the device truly simulates lateral pressure change in the sinking process of the open caisson, captures interaction between the open caisson and a soil body, provides data support, helps to optimize a design scheme, and improves construction safety and efficiency.

A numerical simulation method for seismic stability of a caisson wharf in a wave environment belongs to the technical field of port engineering, and comprises the following steps: drawing a caisson wharf CAD two-dimensional profile diagram; dividing the two-dimensional contour into different areas, and performing unit grid division on the different areas; the earthquake stability analysis of the caisson wharf in the wave environment is completed; and based on the obtained displacement cloud picture of the caisson wharf at the maximum displacement moment under the combined action of the earthquake and the waves, the earthquake stability of the caisson wharf under the wave environment is evaluated by analyzing the deformation of the caisson structure and the surrounding soil body. Based on the method provided by the invention, the seismic stability of the caisson wharf in the wave environment can be simulated and analyzed efficiently and precisely, data reference can be provided for engineering practice, and the problems of scientificity and engineering applicability of seismic stability analysis of the caisson wharf in the wave environment are solved.

The invention discloses an open caisson sinking posture prediction method, which belongs to the technical field of open caisson sinking prediction, and comprises the following steps: constructing a primary data matrix according to on-site actual measurement time sequence data; smoothing the first-level data matrix by using a Savitz-Gauge filtering algorithm to obtain a second-level data matrix; constructing a third-level data matrix in combination with the second-level data matrix and the construction excavation information representation matrix; performing correlation analysis on the three-level data matrix by using three analysis methods to obtain a correlation characterization matrix; screening key variables by using the correlation characterization matrix to construct a four-level data matrix; performing dimension reduction processing on the four-level data matrix by using a principal component analysis method to obtain a principal component matrix; and training a long-short-term memory network by using the principal component matrix to obtain an open caisson sinking posture prediction model to perform open caisson sinking posture prediction so as to obtain an open caisson sinking posture prediction result. According to the method, the accuracy and stability of deep water open caisson sinking posture prediction can be improved.

The utility model relates to the technical field of constructional engineering foundations, and discloses a detachable arc-shaped bracket deviation rectifying support device for open caisson construction, which comprises a left-area detachable supporting piece, a right-area detachable supporting piece, a middle-area anchoring piece, a rubber pad, a weighing sensor, a strain sensor, a limiting hole and a balancing weight. Wherein the left-area detachable supporting piece and the right-area detachable supporting piece are vertically inserted and assembled in an open caisson limiting hole through the middle-area anchoring piece, rubber pads are pasted on the contact faces of the left-area supporting piece and the right-area supporting piece and the inner side wall of an open caisson to prevent structural damage, and the top faces of the left-area supporting piece and the right-area supporting piece are each provided with a weighing sensor. A strain sensor is installed on the external slope of the left area supporting piece. The open caisson deviation rectifying support has the advantages of being convenient to disassemble and assemble, high in safety and the like, and the use efficiency of the open caisson deviation rectifying support can be effectively improved.

The invention provides an open caisson air curtain control method and device, electronic equipment and a computer storage medium, is applied to an open caisson air curtain intelligent cooperative self-healing control system, and relates to the technical field of bridge construction. According to the method, a foundation open caisson structure model is established based on geological and hydrological data, then an air curtain and a monitoring module are added according to a specific construction project, real-time data communication between a real object and the model is established, data are monitored in real time through the monitoring module, and a control instruction is processed and output through the model; the opening and closing of the electromagnetic valves of all the subareas of the air curtain and the air pressure of the air compressor are adjusted in real time, the abnormal condition processing time in the sinking process of the open caisson is shortened, flexible combination of the multiple adjacent air curtain subareas is achieved, manual intervention is reduced in the construction process, and the construction progress is accelerated.

The invention discloses a life bearing capacity degradation prediction method for a port and wharf caisson structure, which comprises a data acquisition module, a coupling analysis processor and a dynamic early warning output module which are arranged, and is characterized in that the data acquisition module comprises a machine vision unit, a distributed optical fiber sensing unit and a parameterized seismic oscillation input module which are arranged; through cooperative work of multiple modules, accurate prediction of the caisson structure is realized. According to the life bearing capacity degradation prediction method of the port and wharf caisson structure, machine vision and optical fiber sensing are combined, surface-interior synchronous three-dimensional quantification of caisson corrosion damage is achieved, the problem of data discreteness of a traditional method is solved, physical mechanism constraints are provided through a finite element model, model errors are corrected through machine learning, and the service life bearing capacity degradation prediction method is achieved. The bearing capacity prediction precision under near-fault pulse type seismic oscillation is improved, a lightweight parallel computing architecture is designed, dynamic coupling calculation of corrosion monitoring data and seismic oscillation input is supported, and minute-level bearing capacity threshold value updating is achieved.

The invention discloses a convenient-to-install environment sensing device for environment monitoring, and relates to the technical field of water quality environment monitoring, the convenient-to-install environment sensing device comprises an unpowered floating plate and a clamping assembly, the clamping assembly is arranged at the middle end of the bottom of the unpowered floating plate, and the clamping assembly comprises a platform arranged at the bottom end of the unpowered floating plate; a through hole is formed in the middle of the platform in a penetrating mode, and the two sides of the platform are fixed to the unpowered floating plate in a suspended mode through connecting rods. The separation stroke of the propeller is linked with the release action of the hollow caisson, and the propeller links the movement of the sliding seat with the movement of the main sliding block under the pulling of the pull rod in the process of retreating from the access groove, so that the main sliding block synchronously drives the auxiliary sliding blocks on the two sides through the rocker arm; according to the unpowered floating plate, the hollow caisson and the anchor chain matched with the hollow caisson are integrated on the unpowered floating plate, the installation steps can be greatly simplified, and the installation efficiency can be improved.

The invention belongs to the field of port engineering construction, and particularly relates to a rapid deployment construction method for universal recyclable caisson reinforcing steel bars in prefabricated caisson reinforcing steel bar structure construction. On the basis of a modularized disc buckle support system push-pull unit, reinforcing steel bars of the outer wall and the inner partition wall of the caisson are integrally bound by combining an assembly type reinforcing steel bar binding frame and an assembly type reinforcing steel bar hoisting frame and presetting a reinforcing steel bar binding mould, and the distance between the reinforcing steel bars and a reinforcing steel bar protection layer are controlled within the controlled range; after the binding frame is separated, force is evenly transmitted through the lifting frame, and the whole steel reinforcement framework is lifted away from the binding clamping fixture through a crane and installed at the preset position. According to the method, the requirement for high-altitude operation is remarkably reduced, the safety of a construction site is improved, meanwhile, accurate arrangement of the steel bars and the thickness of a protective layer are ensured through accurate pre-binding control, and therefore the overall quality and durability of the structure are improved.

This utility model relates to the field of floating wind power, and more particularly to a floating offshore wind power integration system based on fishery-wind complementarity. It includes a floating platform, a wind turbine system, an aquaculture system, and a suction caisson. The aquaculture system includes aquaculture nets. The wind turbine system is located above the floating platform, and the aquaculture nets are located below the floating platform. The suction caisson is connected to the floating platform. Wind power is provided through the wind turbine system, and fishery aquaculture is carried out through the aquaculture system, achieving fishery-wind complementarity integration. Furthermore, the design of the suction caisson ensures the stable arrangement of the entire system. The overall structure utilizes longitudinal sea space, has the characteristics of wide applicability to various sea areas, strong stability, and high energy utilization rate, and is expected to be widely used in the field of floating offshore wind power.

The invention belongs to the technical field of open caissons, and discloses a prefabricated assembly type open caisson, an open caisson shaft assembly method and an open caisson bottom sealing method. The prefabricated open caisson comprises a fore shaft ring beam, a shaft and a bottom sealing layer, wherein the fore shaft ring beam is connected with the ground; the shaft comprises a blade foot ring, a connecting ring, a plurality of standard rings and a fore shaft ring which are sequentially connected from bottom to top, the blade foot ring is used for cutting a soil body and sinking to the ground, and the fore shaft ring is connected with a fore shaft ring beam; the bottom sealing layer comprises a first annular piece, a second annular piece and a circular bottom sealing piece which are sequentially connected from outside to inside, the outer ring of the first annular piece is connected with the inner ring of the connecting ring, and the first annular piece is formed by sequentially connecting a plurality of first fan-shaped connecting parts in the annular direction; and the second annular piece is formed by sequentially connecting a plurality of second fan-shaped connecting parts in the annular direction, and the first fan-shaped connecting parts and the second fan-shaped connecting parts are connected in a staggered joint mode, so that the bottom sealing layer is constructed to be of a bowl-shaped structure, the construction period can be shortened, the project quality can be improved, and the safety risk can be reduced.

The invention discloses a construction method of an automatic bar penetrating device for caisson prefabrication, and relates to the technical field of building construction. Comprising the steps of device structure size adjustment, hoisting platform trial hoisting, bar penetrating facility trial operation, longitudinal steel bar paving and sorting, device first parking, first row bar penetrating, device stepping lifting, device bar penetrating and bar penetrating completion. Through tower crane lifting displacement and manual traction positioning, a double-strand rope with scale marks is adopted at the front end of the lifting platform for lifting limiting, the lifting height of each step is controlled to be consistent with the rib penetrating vertical distance, the rib penetrating position is rapidly aligned, and the rib penetrating efficiency is improved; the paving and discharging mechanism paves and sorts longitudinal steel bars in advance, welding seam positions of adjacent steel bars are prevented from being overlapped, the engineering quality is guaranteed, the single-time bar penetrating number arrangement and bearing requirements of the caisson are met, and the hoisting and lifting displacement frequency is reduced. Through remote control over transverse movement, overturning and longitudinal movement, automatic operation is achieved, and the labor intensity is greatly reduced; in the whole hoisting process, personnel do not need to enter the hoisting platform, and safe construction is guaranteed.

The invention provides a caisson tracked robot trajectory tracking method and system, and relates to the technical field of robotics.The caisson tracked robot trajectory tracking method comprises the steps that original control input is processed through a micro-saturable function based on a Gaussian error function, and a smooth saturation control signal is obtained; calculating a difference value between the smooth saturation control signal and original control input to obtain a saturation error compensation signal; using the smooth saturation control signal, the saturation error compensation signal and the initial state to construct a basic framework of a sliding mode surface through a feed-forward function; and introducing a nonlinear feedback function to the basic framework, and performing staged adjustment on the state of the sliding mode surface through the function to inhibit steady-state overshoot so as to obtain a state variable of the sliding mode surface. According to the method, high-precision and fast-convergence trajectory tracking of the caisson tracked robot in a complex underwater environment is realized through micro saturation processing, dynamic sliding mode surface control, a self-adaptive reaching law and online disturbance compensation.

This invention relates to the field of deep foundation pit support construction technology, specifically a nested support construction process for deep foundation pit elevator shafts and sump pits. It solves the problem that traditional caisson waterproofing technology is prone to failure due to pit wall collapse in highly permeable gravel strata, making it difficult to create stable construction conditions. The process includes a steel caisson support structure, within which a steel caisson waterproofing structure is nested. This steel caisson waterproofing structure is used in conjunction with the steel caisson support structure for nested construction. This invention, through the nested cooperation of the steel caisson support structure and the steel caisson waterproofing structure, and the injection of a self-compacting concrete filling layer, achieves an integrated support and waterproofing effect during construction. It creates a stable, dry, and enclosed working space in easily collapsible, highly permeable strata, solving the problem of failure of traditional single waterproofing technology and creating safe and reliable conditions for subsequent structural construction.

The invention relates to a pipe jacking structure crossing a metro and a current pipeline in a water-rich area and a construction method, the pipe jacking structure comprises a jacking working well structure, a jacking pipe crossing reinforcement protection system, a jacking receiving well structure and a rectangular jacking pipe, the jacking working well structure and the jacking receiving well structure are respectively located at two sides of a metro operation interval and a current pipeline group; the jacking pipe transversely penetrates through the reinforcing protection system, stretches across the subway operation section and the current pipeline group and is located between the subway operation section and the current pipeline group, the jacking pipe transversely penetrates through the reinforcing protection system and obliquely and downwards penetrates through the current pipeline group, and the rectangular jacking pipe horizontally penetrates through the current pipeline group and is arranged across the subway operation section. The two ends of the rectangular jacking pipe communicate with the jacking working well structure and the jacking receiving well structure correspondingly. According to the construction method, potential safety hazards can be eliminated in the construction period that the rectangular jacking pipe overpasses a subway and underpasses a current pipeline group, operation municipal facilities are protected, through reasonable construction procedures, the construction difficulty of the large-size open caisson and the rectangular jacking pipe is greatly lowered, and operation is convenient.

This invention belongs to the field of port engineering structural health monitoring and numerical simulation technology, specifically relating to a digital twin-based seismic stability assessment system and method for caisson wharves. The system includes a data acquisition and processing module, a model update module, and a performance evaluation and early warning module; the method includes data perception and feature extraction, parallel model calibration and update, coupled analysis, and intelligent early warning. This invention establishes a high-fidelity digital twin model that is synchronously updated with the physical entity and utilizes high-performance parallel computing technology to achieve real-time and accurate assessment and early warning of the stability of caisson wharves under combined seismic and wave effects.