175 results about "Earth pressure balance" patented technology

The invention discloses a karst cave identification method based on shield tunneling parameters, and the method comprises the steps: dividing rock stratum types according to the rock stratum information of a shield construction crossing rock stratum and karst cave detection information, and determining karst cave identification indexes through the working principle of an earth pressure balance shield tunneling machine, the soil mechanics theory, historical shield tunneling parameters and non-dimensionalization analysis, and the rock stratum integrity and the karst cave type corresponding to the obtained shield tunneling parameters are determined, and a karst cave recognition system is constructed. The invention further discloses equipment based on the method and a storage medium. The recognition method is easy and convenient to operate and high in cost effectiveness, geological features and karst cave types can be accurately determined, the accuracy of stratum information is ensured, tunneling parameters and shield gestures suitable for the current geological conditions can be determined for shield construction, and the construction efficiency and safety are effectively improved.

The invention discloses a device judging whether or not an earth pressure balance shield earth chamber is full. The device comprises a pressure detector disposed on the upper portion of a front shield earth chamber of the earth pressure balance shield; the signal output end of a pressure sensor is connected with an upper computer; the upper computer judges whether or not the chamber is full; if not, a warning signal is sent to an alarm unit. The device has the advantages that whether or not the earth chamber is full can be judged anytime during earth pressure balance shield tunneling, full-chamber shield tunneling can be ensured and the application of full-chamber tunneling decreases the danger of collapse ahead.

The invention provides a water-rich stratum ultra-short space earth pressure balance shield split launching method. The split launching method sequentially comprises the steps of trolley placement, launching tunnel end stratum reinforcement, launching bracket and counter-force frame installation, tunnel portal chiseling and sealing steel sleeve installation, negative ring upper half ring dismounting, negative ring upper part force transmission replacing with a steel support and the like, and the split launching method comprises the steps of trolley placement, launching tunnel end stratum reinforcement, launching bracket and counter-force frame installation, tunnel portal chiseling and sealing steel sleeve installation, negative ring upper half ring dismounting, negative ring upper part force transmission replacing with a steel support and the like. The problems of water gushing, sand gushing and excessive ground settlement occurring in water-rich stratum earth pressure balance shield split launching are solved, the earth pressure balance shield split launching process in the water-rich stratum ultra-short space is achieved, pipe pieces can be lowered from a shield hoisting opening in the launching process, soil excavation can be achieved, the soil excavation efficiency is improved, and the construction period is shortened. The problem that the shield construction advancing speed is low when the length of a shield launching well pit is far smaller than the overall size of a shield tunneling machine is smoothly solved.

The invention discloses an earth pressure balance shield intelligent tunneling auxiliary method and system, and belongs to the technical field of tunnel engineering. The system comprises a tunneling parameter real-time forwarding system, a shield construction intelligent calculation background and a large data screen, according to the system, firstly, real-time tunneling parameters are obtained through a tunneling parameter real-time forwarding system in a ground monitoring computer installed on a construction site, and then geological parameters, geometric parameters, vibration parameters, construction parameters and the like which are imported in advance and collected by sensors in real time are combined in a shield construction intelligent calculation background; all the trained machine learning models are called for real-time prediction, result data of all the function modules are obtained, finally, results are visualized, and calculation results, real-time parameters, construction basic information and the like are displayed through a large data screen serving as a main interface of the system.

The invention provides a shield tunneling machine earth pressure balance autonomous control method based on warm start DDPG, and relates to the technical field of shield tunneling machines. Comprising data warm start and reinforcement learning training; warm start is carried out on the Actor network based on a large amount of construction data, and hidden key features and rules in the data are learned; on the basis of warm start, a deep reinforcement learning method is introduced, a control strategy is continuously optimized through interaction with an actual construction environment, and finally intelligent decision-making of earth pressure balance of the shield tunneling machine is achieved. Through data pre-training, the Actor network can preliminarily adapt to a complex construction environment, the number of trial and error times is reduced, and the invalid trial and error cost at the initial stage of intelligent agent training is remarkably reduced. And reinforcement learning training forms a closed-loop control chain of state perception-decision optimization-execution feedback through real-time interaction with a dynamic construction environment, so that not only is gradual fine adjustment of a control strategy in the tunneling process realized, but also the decision response speed and precision are improved, and finally, intelligent decision making of earth pressure balance of the shield tunneling machine is realized.

The invention relates to the technical field of shield construction, in particular to an under-pressure tool changing construction method for a high-water-pressure long-distance shield to penetrate through a soft and hard composite stratum. Comprising the steps of double plugging (secondary grouting is conducted behind the wall of a segment at the shield tail through double-liquid slurry, and polyurethane is injected into a shield body shell at the middle shield position), tunnel advanced grouting reinforcement, tunnel face mud film retaining wall construction, tool replacement under pressure and pressure reduction and cabin exiting. The construction method has the beneficial effects that secondary grouting is conducted on the wall back of the shield tail segment through cement paste and water glass, polyurethane is injected into a shield body shell in a matched mode to form a closed water stop ring, a double-blocking system is formed, underground water is prevented from moving forwards, a gap between a shield body and surrounding rock is filled, stability of a soil body above a shield is guaranteed, and the construction quality is improved. Secondly, advanced grouting reinforcement and bentonite mud film retaining wall manufacturing are conducted, it is guaranteed that the air pressure in the soil cabin and the water and soil pressure outside the cabin are balanced, and the safety of under-pressure tool changing construction is improved.

The invention relates to an earth pressure balance shield construction safety toughness dynamic evaluation system and method based on an extended cloud model and a network analysis method, and the system comprises an index system construction module which builds a multi-level toughness evaluation system based on a literature measurement and factor analysis method; an entropy weight TOPSIS weight calculation module objectively calculates the initial weight of the index through an information entropy theory; the ANP network weight optimization module corrects and optimizes the global weights of the indexes by constructing an inter-index nonlinear dependency network and a feedback mechanism; and the extended cloud toughness evaluation module quantifies qualitative indexes into membership degrees for different toughness levels based on expectation, entropy, hyper-entropy and other digital characteristics, comprehensively integrates weights and the membership degrees, and finally outputs soil pressure balance shield construction safety toughness levels and targeted optimization strategies. According to the method, multi-dimensional toughness quantitative evaluation and dynamic prevention and control of the construction safety risk of the earth pressure balance shield (EPB) can be realized under the complex stratum condition.

The invention discloses a starting construction method of an earth pressure balance shield machine, and relates to the technical field of shield construction. Comprising the following steps that a construction hole is reinforced, and after reinforcement, core drilling sampling is adopted for checking the uniformity and self-supporting performance of a soil body after reinforcement; a steel sleeve is customized according to the size of a construction hole, annular brushes are arranged in the steel sleeve and provided with annular brush bristles with the tail ends extending towards the side of the hole, the steel sleeve is provided with a grease filling hole, the grease filling hole is located between the two annular brushes, and the inner side length of the annular brush bristles is larger than the outer side length of the annular brush bristles. The annular bristles are gradually close to the steel sleeve from the outer side bottom end to the inner side bottom end; the steel sleeve is installed to a construction hole, and then a grouting pipe is installed; sealing treatment is conducted on the construction hole, and pressure maintaining testing is conducted after sealing treatment; and the shield tunneling machine starts tunneling construction. The launching construction method of the earth pressure balance shield machine has the beneficial effects of being easy to install, good in sealing performance and high in pressure bearing capacity.

The invention discloses a shield muck-based wall post-grouting material and a preparation method thereof, and belongs to the technical field of solid waste material reutilization and grouting material preparation, the grouting material comprises the following components by weight: 5.2-5.7 parts of earth pressure balance shield muck, 0.1-0.3 part of an adsorbent, 0.4-1 part of an alkali excitation material, 2.75-3.5 parts of water, and 0-0.03 part of an additive; the adsorbent is a product obtained by carbonizing concrete micro powder in a carbon dioxide atmosphere; the alkali excitation technology is adopted, the novel low-carbon inorganic curing agent is compounded with the compound shield muck and the carbonized micro-powder adsorbent, the alkali excitation grouting material with the high solid waste ratio is developed, the muck generated by shield is fully utilized for resource utilization, and the prepared grouting material is high in early strength, good in fluidity and high in solid waste content. And harmful substances in the shield muck can be effectively adsorbed, and pollution caused in the muck transferring process is avoided.

The invention belongs to the technical field of slurry shield slurry film forming, and particularly relates to a dynamic earth pressure balance shield slurry film forming test device and a maintenance observation method.The dynamic earth pressure balance shield slurry film forming test device comprises a base assembly, a stratum box assembly, a shield tunneling machine simulation assembly and a driving assembly, and the stratum box assembly, the shield tunneling machine simulation assembly and the driving assembly are all installed on the base assembly; the shield tunneling machine simulation assembly is in butt joint fit with the stratum box assembly, and the driving assembly is connected with the shield tunneling machine simulation assembly and used for driving the shield tunneling machine simulation assembly to excavate and convey slurry. According to the invention, the limitation that only static simulation can be realized in the existing test can be solved, the actual construction working condition is fit, different water pressure stratum environments can be simulated, constant temperature, humidity and pressure of a mud film working environment can be maintained, the reference value of a test result is improved, and full-flow data from film forming to pressure maintaining and visual support are realized, and the performance of the mud film is accurately captured.

The invention is suitable for the technical field of earth pressure balance shield tunnel safe tunneling, and provides a shield soil cabin pressure control method in an air pressure auxiliary tunneling mode, which comprises the following steps: according to the volume percentages of gas, solid and liquid phases, pore water pressure and air pressure of foam improved muck, considering the compressibility and the unsaturation of the foam improved muck; obtaining the vertical effective stress distribution of the muck in the soil cabin; determining gas-soil mixing pressure distribution in the soil cabin according to the height of a gas-soil interface in the soil cabin; according to the rotating speed of the spiral conveyor, the shield tunneling speed and the air pressure loss amount in the soil cabin, determining air-soil mixed pressure distribution at the next moment; by adjusting the tunneling speed of the shield tunneling machine and the rotating speed of the screw conveyor, the gas-soil mixed pressure resultant force in the soil cabin is between the active soil pressure resultant force and the passive soil pressure resultant force of the excavated stratum. The control precision of the air-soil mixing pressure in the shield soil cabin in the air pressure auxiliary tunneling mode can be improved.

The invention relates to the field of underground engineering construction technology auxiliary equipment, and provides a pumping deslagging device for a long-distance rectangular jacking pipe, the pumping deslagging device comprises a stirring assembly and a pumping assembly, the stirring assembly is arranged below a discharge port of a spiral unearthing device, the pumping assembly comprises a muck pump and a pumping pipeline, the muck pump is arranged below a discharge port of the stirring assembly, and the pumping pipeline is connected with the stirring assembly. A feeding port of the muck pump is connected with a discharging port of the stirring assembly, a discharging port of the muck pump is connected with the pumping pipeline, and an outlet of the pumping pipeline is formed in the muck pool. The device further comprises a grouting assembly and a plurality of resistance reduction rings. The grouting assembly comprises a first grouting mechanism and a second grouting mechanism. The construction efficiency is greatly improved, the method can adapt to different stratum conditions, and efficient construction of the long-distance earth pressure balance rectangular pipe jacking is achieved.

The embodiment of the invention discloses a high-performance composite shield foaming agent and a preparation method thereof. The high-performance composite shield foaming agent comprises the following components in percentage by weight: 5%-8% of an anionic surfactant; 3%-7.5% of an ampholytic surfactant; 1.2%-2% of an auxiliary agent; 0.2%-0.5% of a thickening agent; 2%-5% of an anticoagulant; and the balance of solvent. The foaming agent provided by the invention has good stratum and engineering environment applicability. Particularly, the foaming agent has good tolerance to environment temperature, acid, alkali and salt, achieves high foaming ratio and stability, and can well meet muck improvement requirements under different working conditions in the tunneling process of the earth pressure balance type shield tunneling machine.

The invention discloses a shield tunneling machine soil pressure balance control method and system based on multi-parameter dynamic optimization, and relates to the technical field of shield tunneling machine control. The method comprises the following steps: calculating a support force required in a shield tunneling process under a current working condition and a theoretical shield soil bin pressure observation value, and establishing a relationship through a linear fitting mode to obtain a soil bin pressure transfer coefficient under a current stratum condition; calculating the theoretical support force of the tunnel face in the tunneling process, and calculating the preset value of the shield soil bin pressure in combination with the soil bin pressure transfer coefficient; and acquiring a real-time shield soil bin pressure observation value, and performing multi-parameter collaborative optimization on an error between the preset value of the shield soil bin pressure and the real-time shield soil bin pressure observation value by using a particle swarm optimization algorithm to obtain an optimized control parameter. According to the method, the pressure of the soil bin can be adjusted more accurately according to actual conditions, so that dynamic balance of an excavation face in the construction process is ensured, and safety and stability of underground tunnel construction are guaranteed.

The present invention relates to the technical field of pipe construction, and in particular to a relay transport method and conveyance device for earthworks in a pipe in earth pressure balance pipe jacking. The working principle of the relay transport method for earthworks in a pipe in earth pressure balance pipe jacking of the present invention is that the distance of a single jacking is reasonably divided into a plurality of relay sections, and each relay section is equipped with an earth conveying trolley, so as to achieve relay conveyance of the earthworks in the pipe. The conveyance device for earthworks of the present invention comprises earth conveying trolleys and a relay station hopper exchange system, and the trolleys of adjacent relay sections achieve exchange of a fully-loaded hopper and an empty hopper in a pipe by means of the relay station hopper exchange system, achieving the transfer of the earthworks between the trolleys. Compared with a conventional method in earth pressure balance pipe jacking for conveying earthworks by using a single trolley, the method of the present invention has the advantages that the machine head stalling waiting time caused by earthwork conveyance can be greatly shortened, and especially for long-distance pipe jacking construction, the construction efficiency can be greatly improved.

The invention discloses a mechanical spiral shaft sealing device, which relates to the technical field of shield tunneling construction, and comprises an optical shaft and a smooth shaft section arranged at the middle section of a spiral shaft, the cylinder body is sleeved outside the polished shaft, and a slag discharging channel is formed between the cylinder body and the polished shaft; the sealing piece is arranged in the cylinder body and can be expanded in the radial direction of the cylinder body to seal the slag discharging channel; and the gate movably penetrates into the cylinder body to fold and unfold the sealing piece. According to the mechanical spiral shaft sealing device, spiral blades are not welded to the polished shaft section, muck is not affected by a lead angle on the polished shaft section, the muck can be passively extruded on the polished shaft section, the soil plug effect is formed, and a certain water gushing blocking effect is achieved; when necessary, the gate and the deslagging channel can be closed, the purpose of completely blocking gushing water is achieved, the problem that the internal construction environment of the earth pressure balance shield tunneling machine is polluted by muck gushing in the water-rich stratum construction of the earth pressure balance shield tunneling machine can be effectively solved, the pressure stability of an earth bin is guaranteed, and then the tunneling safety of equipment is guaranteed.

The utility model relates to the technical field of shield tunnel engineering, in particular to an earth pressure balance shield muck in-situ solidification system. The system comprises a spiral conveyor, a belt conveyor, a spiral conveying device, a vertical conveying device and a curing agent storage tank, the spiral conveyor is arranged at the muck output end of the earth pressure balance shield machine; a belt conveyor is arranged at one end, far away from the earth pressure balance shield machine, of the spiral conveyor; a spiral conveying device is arranged at the end, away from the spiral conveyor, of the belt conveyor. A vertical conveying device is arranged at the end, away from the belt conveyor, of the spiral conveying device. A soil inlet butted with the spiral conveying device is formed in the lower end of the vertical conveying device, and a soil outlet butted with external transfer equipment is formed in the upper end of the vertical conveying device; the curing agent storage tank is connected with the spiral conveying device. According to the utility model, the problems of high investment cost, large occupied area and low muck treatment efficiency in the traditional muck solidification treatment mode can be solved, and the reutilization of muck resources is realized.

The invention discloses an earth pressure balance shield machine earth cabin pressure robust tracking control method and system based on adaptive dynamic programming, and the method comprises the following steps: collecting historical operation data of an earth cabin pressure system of an earth pressure balance shield machine, and carrying out the preprocessing of the historical operation data, and obtaining the preprocessed data; performing dynamic modeling on the soil cabin pressure system by using the preprocessed data, constructing an RBF-ARX model, and optimizing the RBF-ARX model; the optimized RBF-ARX model is reconstructed, and a state space model is obtained; then constructing a comprehensive controller comprising a steady-state controller and a disturbance feedback controller; and converting the state space model into an equivalent nominal system through a utility function, then constructing an optimality equation of dynamic programming, learning a control strategy through an adaptive dynamic programming method, and obtaining approximate optimal control input of the nominal system.

The invention discloses a long-distance small-diameter shield backfilling receiving method, and relates to the technical field of tunnel construction. Retesting the tunnel portal; adjusting the posture of the shield tunneling machine; backfilling in the well; the shield tunneling machine arrives at the tunneling section to receive in the well and tighten the duct piece for water prevention; grouting a tunnel portal; cleaning muck in the well; and disassembling and hoisting out the shield tunneling machine. According to the shield backfilling receiving method, before a working well enclosure structure is broken through shield tunneling, soil filling is conducted, a cover plate is poured on the top of a shield body, water is poured to the current underground water level height, after the enclosure structure is broken through a tunnel portal, water and soil pressure for balancing a tunnel face is provided in the working well, and a shield tunneling machine enters a receiving working well step by step; sealing grouting reinforcement treatment is adopted on the periphery of a tunnel portal, finally, muddy water and filler in a shield well are pumped out, a shield tunneling machine is dismantled, and by means of the principle that water and soil pressure inside and outside a foundation pit is balanced, the shield tunneling machine can be smoothly received, and meanwhile the safety of pipelines on the periphery of a receiving section is guaranteed.

This invention discloses an automatic shearing device for the mud outlet of a spiral excavator in an earth pressure balance tunnel boring machine (TBM). It includes an outlet pipe connected to the mud outlet pipe of the spiral excavator and cylinder seats on its left and right sides. A first rotating cylinder and a second rotating cylinder, rotating in opposite directions, are respectively mounted on the two cylinder seats. A first U-shaped shear, formed by a first shearing plate and two first rotating arms, is rotated by the first rotating cylinder. A second U-shaped shear, formed by a second shearing plate and two second rotating arms, is rotated by the second rotating cylinder. The second U-shaped shear and the first U-shaped shear are nested together. This invention can automatically cut and clean the clay adhering to the mud outlet of the spiral excavator, avoiding equipment malfunctions caused by mud outlet blockage and preventing personal injury accidents due to gushing during manual clay cleaning. This reduces safety risks and improves the efficiency of TBM excavation.

The invention discloses a water-rich karst stratum earth pressure balance shield tail sealing system protection method, which is characterized in that a metal fender (7) tool is designed below a connecting bridge (4) to form a movable slag collecting pit (8), pumped foreign matters are prevented from flowing to a shield tail along with sewage, and the water-rich karst stratum earth pressure balance shield tail sealing system is protected. The trolley (5) synchronously moves forwards when the track extends, a vacuum slag suction tank (9) is arranged on the trolley (5), sludge in the area of the trolley (5) is sucked into the sludge tank through negative pressure, and then the sludge is conveyed to a belt conveyor (6) from the other end to be conveyed out of a tunnel; a metal and rubber combined fender (7) is designed in a shield tail area to prevent shield tail sludge from entering a shield tail brush, the metal and rubber combined fender (7) is installed on the end face of a duct piece (3) and fixed through a main jacking oil cylinder, cleaning is conducted through a sludge pump and manual work before assembly, after the shield tail area is cleaned up, a retraction oil cylinder is used for synchronously removing the fender (7), and after the duct piece (3) is assembled, reinstallation is conducted to enter the next cycle operation.

This invention discloses a soil-conditioning earth pressure balance shield tunneling machine capable of performing frozen soil construction. It includes a frame-type soil sample box, a shield tunneling machine body, and a freezing system. The shield tunneling machine body mainly consists of a tunneling system, a transmission system, a soil removal system, and an additive pipeline system. The freezing system includes a cold circulation system, which comprises a refrigerant tank and a refrigerant pipeline system. The refrigerant pipeline system is connected to the refrigerant tank at both ends and is located in the frame-type soil sample box. The refrigerant tank is connected to a refrigeration system. This device can freeze the soil through the freezing system. After the freezing is completed, the shield tunneling machine is controlled to feed at a constant speed according to a set rate. Soil-conditioning reagents are injected through the additive pipeline system according to the experimental requirements. This shield tunneling machine can simulate frozen shield tunneling construction and improve the soil. The device has high integration, high accuracy of experimental data, and strong equipment specialization.

The application discloses a soil conveying device of a soil pressure shield tunneling machine, which comprises a screw conveyor connected with a soil bin of the soil pressure shield tunneling machine, an outlet of the screw conveyor is connected with a foam filling machine, the foam filling machine is connected with a belt conveyor, and an outlet end of the belt conveyor is connected with a soil bucket for external transportation. The soil conveying device of the soil pressure shield tunneling machine is provided with the foam filling machine, can perform foam filling operation on the soil output by the screw conveyor, successfully improves the effect of the soil output by the screw conveyor through the foam, makes the soil have good fluidity, plasticity and waterproof permeability, realizes continuous and efficient transportation of the soil, has high automation degree, and effectively solves the problems of long construction period and great safety hidden danger of the existing soil discharging mode of the shield tunnel.

The invention relates to an earth pressure balance control method and system for assisting in shield attitude adjustment. The method comprises the steps that historical data are collected, and an earth pressure setting model is constructed; in the tunneling process of the shield tunneling machine, actual construction data, actual ground surface settlement monitoring data and shield tunneling machine tunneling data are obtained in real time; based on the tunneling data of the shield tunneling machine, whether advancing of the current ring is finished or not is judged, if yes, an earth pressure setting model is called, and the earth pressure setting model calculates and outputs a theoretical earth pressure set value of the next ring based on the actual construction data and the actual ground surface settlement monitoring data; whether the elevation of the shield tail is continuously lower than a preset elevation threshold value within a certain time range and cannot be increased or not is judged based on tunneling data of the shield tunneling machine, and if yes, a soil pressure front half ring pressurization mode is started so that the soil pressure set value of the front half ring of the next ring can be automatically pressurized. According to the method, the shield tunneling posture and the earth pressure influence of ground surface settlement are comprehensively considered, and the accuracy of the earth pressure set value is guaranteed.

The utility model discloses a synchronous grouting weighing system of a shield tunneling machine and relates to a mortar tank, six mortar tank supporting legs are arranged at the bottom of the mortar tank, each mortar tank supporting leg is provided with a welding bottom plate and a weighing sensor, the tops of the six mortar tank supporting legs are connected with H-shaped steel at the bottom of the mortar tank in a welding mode through the welding bottom plates, and the weighing sensors are arranged on the welding bottom plates. The bottoms of the mortar tank supporting legs are welded with the shield tunneling machine trailer platform; the weighing sensors are arranged at the bottoms of supporting legs of the mortar tank, and the six weighing sensors jointly measure the weight of the mortar tank and monitor the real-time weight change of the mortar tank. The supporting leg is simple in structure, suitable for earth pressure balance and slurry balance shield tunneling machines at the same time, capable of adjusting the distance between the supporting legs according to the size of a mortar tank and wide in application range; the tops and the bottoms of the supporting legs are fixed through bolts and gaskets, disassembly and assembly are convenient, repeated use can be achieved, and the production cost is saved.

The present application relates to the technical field of shield construction, and provides a soil pressure balance shield muck volume measuring and calculating method based on three-dimensional muck bucket scanning, which comprises the following steps: step 1, preprocessing: filtering out other parts except the muck bucket, wherein the other parts include a railcar head and a pipe piece; step 2, muck bucket separation: dividing the muck bucket into independent point cloud clusters; step 3, coarse segmentation: firstly, removing the point clouds of the left and right side walls of the muck bucket; secondly, removing the point clouds of the front and back side walls of the muck; step 4, fine segmentation: removing the residual point clouds of the front and back side walls again; then, filtering the scattered points left in the above steps, that is, removing noise points; step 5, volume calculation: completing the missing point clouds in the middle of the empty muck bucket, dividing the obtained pure muck surface points into triangular meshes, and realizing muck bucket loading volume calculation; and obtaining the single tunneling ring muck volume by subtracting the full-load muck bucket volume result from the empty-load muck bucket volume result. The present application can preferably measure and calculate the muck volume.

The invention belongs to the technical field of tunneling muck improvement and water adding, and particularly discloses an earth pressure balance shield mudstone stratum tunneling muck improvement method which comprises the following steps: S1, carrying out stratum analysis on a mudstone stratum, and selecting an improvement material; s2, a frequency converter is additionally arranged on an original bentonite pump, and the frequency converter is integrated with a central control system of the shield tunneling machine through an intelligent control interface; s3, one water tank and two piston pumps are additionally arranged, meanwhile, a frequency converter, a flow sensor and a pressure sensor are arranged, and the intelligent water flow dynamic regulation and control technology is used for controlling the water adding flow in real time; s4, in the tunneling process of the shield tunneling machine, the muck is improved in real time through a water injection nozzle in front of a cutter head of the shield tunneling machine and a bentonite water adding injection line; and S5, after the shield tunneling machine completes tunneling of each ring, the improvement effect of the cutterhead and the muck is evaluated, system maintenance is carried out, and a water adding pipeline is checked and cleaned. The mud rock stratum muck improvement effect can be improved, and water adding flow and water pressure control is achieved.

The utility model discloses an earth pressure balance shield machine for pile foundation construction, and relates to the technical field of pile foundation construction equipment. The device comprises a supporting base table, a penetrating opening is formed in one end of the supporting base table, a mounting table penetrates through the penetrating opening, a sleeve is rotatably connected to the bottom of the mounting table, an excavating head is fixedly connected to the bottom of the sleeve, a portal frame is fixedly connected to the top of the supporting base table, and a hydraulic push rod is fixedly connected to one end of the portal frame; lifting sliding grooves are symmetrically formed in one end of the portal frame. When the hydraulic push rod is started to drive the excavating head to excavate downwards in the length direction of the lifting sliding groove, soil blocks excavated by the excavating head are filled into the sleeve, and meanwhile, soil pressure is generated in the sleeve and acts on the surface of the sleeve in cooperation with thrust applied to the sleeve by the hydraulic push rod; and therefore, the soil pressure and the water pressure in the stratum form a balance state, the stability during pile foundation construction is effectively improved, and the problems that the soil layer collapses and formed holes are not vertical during pile foundation construction are solved.

The utility model relates to an earth pressure balance shield machine cutterhead driving assembly transporting and overturning device which comprises a horizontal transporting frame, an overturning frame and a hanging bracket. The horizontal transportation frame comprises a horizontal frame and a supporting and fixing platform located on the horizontal frame. The overturning frame comprises a vertical frame, a horizontal connecting frame and an arc-shaped overturning frame. The hanger is provided with a first lifting lug; the vertical frame is provided with a supporting and fixing platform, and a second lifting lug is arranged on the top side of the vertical frame. The right end of the horizontal frame is fixedly connected with the left end of the horizontal connecting frame through a bolt; the supporting and fixing platform of the horizontal conveying frame and the supporting and fixing platform of the overturning frame are used for supporting the cutter head driving assembly and are fixed to the cutter head driving assembly through bolts. The hanging bracket is used for being fixed to the end, away from the overturning frame, of the cutterhead driving assembly through bolts. The cutter head driving assembly solves the problems of potential safety hazards and inconvenience in operation in the assembly process of the cutter head driving assembly when the large-size earth pressure balance shield tunneling machine is installed, omits a high-altitude operation link, and reduces the probability of safety accidents.

The application is suitable for the technical field of earth pressure balance shield tunneling safety, and provides a shield soil cabin pressure control method in a pneumatic auxiliary tunneling mode, which comprises the following steps: obtaining the vertical effective stress distribution of the soil in the soil cabin according to the gas, solid and liquid three-phase volume percentages, pore water pressure and air pressure of the foam improved spoil, and considering the compressibility and unsaturation thereof; determining the air-soil mixed pressure distribution in the soil cabin according to the air-soil interface height in the soil cabin; determining the air-soil mixed pressure distribution at the next moment according to the screw conveyor speed, shield tunneling speed and air pressure loss amount in the soil cabin; and adjusting the shield tunneling speed and screw speed so that the air-soil mixed pressure resultant force in the soil cabin is between the active soil pressure resultant force and the passive soil pressure resultant force of the excavation stratum. The application can improve the control precision of the air-soil mixed pressure in the shield soil cabin in the pneumatic auxiliary tunneling mode.