46 results about "Cave-in" patented technology

The invention discloses a tunnel blasting simulation method and system for a karst area, and relates to the field of tunnel blasting simulation, and the method comprises the steps: building a three-dimensional geologic model of the karst area, and generating an initial ground stress distribution rule through numerical simulation; generating refined initial crustal stress field data; calculating stress wave intensity and time sequence data generated by explosion; acquiring stress wave propagation data; calculating the surrounding rock damage degree and the crack initial position and direction; simulating the surrounding rock crack propagation process, and calculating the penetration probability and the propagation speed of the crack near the karst cave in combination with the karst cave characteristic parameters; analyzing the surrounding rock stability and damage evolution trend of the karst cave area; and optimizing explosive source item parameters and stress wave propagation boundary conditions, and generating a karst area tunnel blasting simulation result. According to the method, the influence of the karst cave on stress wave propagation is accurately simulated, powerful support is provided for optimizing a blasting scheme and improving construction safety and efficiency, and the method has important guiding significance on tunnel engineering under complex geological conditions.

The invention discloses a bridge pile foundation karst cave treatment method, and relates to the technical field of buildings. Comprising the following steps: acquiring three-dimensional model information of a karst cave; determining a filling mode of the karst cave according to the three-dimensional model information of the karst cave; the karst cave is filled according to the filling mode and the corresponding filling slurry; wherein the fluidity of the filling slurry is 220 to 300 mm. The three-dimensional model information of the karst cave is obtained, the karst cave is filled according to the filling mode and the corresponding filling slurry, accurate filling can be conducted according to the actual shape of the karst cave, waste of filling materials is reduced, and localized and quantitative controllable treatment is achieved. The fluidity of the filling slurry is 220-300 mm, so that the filling slurry can be in a flow state and flow among complex gullies in the karst cave, filling of the karst cave is achieved, and the filling strength is improved.

The present invention discloses a method for effectively disassembling a nuclear magnetic resonance relaxation time spectrum, comprising the following steps: S1, constructing a probability density function of pores and caves according to the distribution characteristics of pores and caves in a core nuclear magnetic resonance T2 spectrum; S2, setting the sum of the nuclear magnetic spectrum areas to 1, randomly generating n data points within the interval of pore distribution, and dividing all the data points into multiple data sets by screening peak values; S3, calculating a likelihood function; S4, calculating a priori probability that each data point belongs to a pore or a cave; S5, updating various parameters in an iterative method using the priori probability; and S6, calculating a new logarithmic likelihood based on the updated parameters, and updating the expected E in the iterative method. p and E v , expected E p and E v Repeat steps S2 to S5 until the convergence condition is met and the iteration is terminated. The present invention combines nuclear magnetic resonance testing with an iterative method to decompose the nuclear magnetic resonance spectrum, thereby improving the accuracy of the spectral shape distribution.

The invention discloses an intelligent identification method for geometric parameters of a karst cave in an engineering construction area, and relates to the technical field of foundation pit engineering, and the method comprises the steps: carrying out the preprocessing of a karst cave parameter data set, and extracting key feature parameters; solving a forward mapping model among karst cave parameters, ground surface settlement displacement and foundation pit side wall inclination displacement through partial derivative to obtain a kernel function, and constructing a nonlinear mapping relation; and performing iterative optimization on the initial parameters by adopting a multi-path random jump search algorithm, and performing inversion to obtain optimal karst cave geometric parameters matched with actual monitoring data. According to the method, through combination of an intelligent optimization algorithm and a mapping model, accurate identification of karst cave parameters is realized, and reliable technical support is provided for safety evaluation of foundation pit engineering and drilling of a soil layer.

The application discloses a kind of geological tube wave detection signal processing methods for vertical string-shaped karst cave in karst topography, applicable to geological exploration field, this method is mainly by first carrying out wavelet threshold denoising method processing to vertical string-shaped karst cave in karst topography geological tube wave detection signal to remove noise, mean filtering is carried out to obtain direct tube wave waveform and reflected tube wave waveform, two-dimensional filtering and fourier transform are carried out to reflected tube wave waveform to obtain uplink reflected tube wave waveform and downlink reflected tube wave waveform, finally waveform is analyzed to obtain time-depth curve, barycentric frequency-depth curve and reflection coefficient-depth curve to be used for the quantitative interpretation of tube wave detection result.The tube wave signal processing method proposed in the application has the advantages of strong anti-interference, small error, etc., compared with the traditional tube wave signal processing method, and has better applicability under the geological conditions of vertical string-shaped karst cave in karst topography.

The present invention discloses a tunnel blasting simulation method and system for karst areas, which relates to the field of tunnel blasting simulation. The method comprises: establishing a three-dimensional geological model of the karst area, generating the initial geostress distribution law through numerical simulation; generating refined initial geostress field data; calculating the stress wave intensity and time series data generated by the explosion; obtaining stress wave propagation data; calculating the degree of surrounding rock damage and the initial position and direction of the crack; simulating the surrounding rock crack propagation process, and calculating the crack penetration probability and propagation speed near the cave in combination with cave characteristic parameters; analyzing the surrounding rock stability and damage evolution trend in the cave area; optimizing the explosive blast source term parameters and stress wave propagation boundary conditions, and generating tunnel blasting simulation results in the karst area. By accurately simulating the influence of caves on stress wave propagation, the present invention provides strong support for optimizing blasting plans and improving construction safety and efficiency, and has important guiding significance for tunnel engineering under complex geological conditions.

The application provides a cave sampling device for prospecting, and relates to the field of prospecting.The sampling device is mainly composed of an upper fixing disc, a lower fixing disc, a lead screw, a light screw, a motor, a sliding block, a sampling drill, a transmission mechanism, a feeding mechanism and a material receiving chute.The upper fixing disc and the lower fixing disc are used for fixing the sampling device in a cave.The sliding block, the lead screw, the light screw and the motor form a linear motion mechanism moving in the vertical direction.The feeding mechanism and the transmission mechanism are used for driving the sampling drill to sample.The material receiving chute is arranged below the sampling drill and is used for collecting the falling geological samples.The application realizes continuous sampling of the cave in a certain depth interval, and can put the drilled geological samples into the corresponding height storage compartment, so that the geological exploration personnel can intuitively and clearly establish the relationship between the sampled geological samples and the cave depth.The application has a clever and compact structure, and minimizes the outer diameter of the sampling device, thereby greatly reducing the excavation cost of the cave.

This invention discloses an auxiliary construction device for concealed karst cave pile foundations, comprising an acid etching tube section, which is a tube structure for swirl-dissolving the outer shell of the karst cave, with a connecting head at its upper end; and a connecting tube section, which is threadedly connected to the upper end of the acid etching tube section, with both inner and outer tubes communicating with the acid etching tube section. Through the arrangement of the acid etching tube section and the connecting tube section, this invention not only guides the acid water along a designated path, allowing it to scour and dissolve the shell of the karst cave in a trailing swirling motion, achieving rapid dissolution of the karst cave shell, but also allows for the extraction and recovery of neutralizing slurry into the mixing chamber and mixing during the dissolution process. Simultaneously, it enables the addition of reinforcing materials to the slurry and the application, filling, and reinforcement of the inner wall of the karst cave with the mixed concrete slurry, thereby ensuring the safety and stability of the duct after dissolution and avoiding the adverse effects of cracks in the karst cave shell.

The present invention relates to a method for analyzing the stability of pile-foundation karst cave roofs in deep-covered karst sites, comprising the following steps: S1, collecting and analyzing geological data in the project area to understand the macroscopic development characteristics of the karst in the site; S2, conducting site exploration using an optimized transient electromagnetic method; S3, conducting site seismic reflection exploration; S4, delineating the karst development range based on karst anomaly locations determined by comparison between the optimized transient electromagnetic method and the seismic reflection method; S5, based on the pile foundation design plan, verifying the stability of the roof under the shear bearing capacity of the roof under the limit equilibrium condition for karst caves or soil caves with potential collapse in the roof rock mass below the pile end, and for karst caves in limestone layers with thick roof rock layers; S6, verifying the safe thickness of the roof for fractured rock masses with developed fissures and thick, relatively strong, and intact rock masses; and S7, determining the safe thickness of the cave roof. The present invention effectively controls pile length, reduces project costs, and shortens construction period.

1. Name of the product in this design: Camera (W). 2. Applications of this design: for inspecting the interior of pipes such as water supply pipes, air conditioning pipes, cable pipes, pipe vacuum systems, lead industry pipes, underground pipes in buildings, rescue work in confined spaces, exploration of underground caves in the wild, and underwater riverbed scientific research. 3. The key design feature of this product is its shape. 4. Images or photos that best illustrate the design key points: usage status reference diagrams.

This application relates to a method for treating karst caves in tunnels, belonging to the field of underground structure engineering technology. The method includes dividing the existing tunnel floor slab into multiple construction sections; in the current construction section, multiple construction holes are opened in the floor slab using a skip-section method, with the size of the construction holes configured to provide operational space for rebar splicing and waterproofing layer repair; grouting is performed into the soil beneath the existing tunnel through the construction holes; after the grouting is deemed satisfactory, the floor slab rebar and waterproofing layer at the construction holes are repaired; after completing the treatment of the current construction section, the process is repeated in the next construction section until all construction sections are treated. By opening relatively large construction holes and specifically configuring sufficient operational space for rebar splicing and waterproofing layer repair, even if the floor slab rebar is cut during construction, standardized splicing operations and waterproofing layer restoration can still be performed using this space.

The present application relates to the safety factor range determination method, device, equipment and medium of karst cave slope, method includes: obtaining the maximum and minimum of the slope in X direction, Y direction;Based on the maximum and minimum of the slope in X direction, according to the vertical division interval, the slope is divided along X direction, and a plurality of vertical units are obtained;Based on the maximum and minimum of the slope in Y direction, the unit body of random height is generated in each vertical unit;According to the unit body, the distribution of rock-soil mass and karst cave in each vertical unit is determined, and the simulation model of karst cave slope is constructed;The simulation model of karst cave slope is calculated, and the safety factor of the slope is obtained;A plurality of groups of safety factors of the slope are obtained by iterative calculation, and the range of the safety factor of the slope is determined based on each group of safety factors of the slope.The present application can provide reliable data support for the engineering design of karst cave slope, and safety and engineering economy are taken into account.

The utility model relates to the technical field of karst cave grouting, in particular to a grouting anti-pollution device for a shield to penetrate through a karst area earth surface karst cave, which comprises a connecting bin and an inserting pipe, a supporting rod is fixedly connected to the outer surface of the connecting bin, an adjusting rod is sleeved on the surface of the supporting rod through threads, and a surface passage of the inserting pipe is connected with an air injection pipe. The outer surface of the gas injection pipe is sleeved with a gas conveying pipe, the outer surface of the insertion pipe is sleeved with an abutting disc, the outer surface of the abutting disc is connected with an abutting rod in a penetrating mode, and a movable groove is formed in the surface of the gas injection pipe in a penetrating mode. The elastic rotation effect of the abutting block on the gas injection pipe is achieved through the connection of the abutting block and the supporting spring, the sleeving and sealing operation of the gas delivery pipe on the gas injection pipe is completed through the connection of the supporting spring and the sealing ring, and the regulation and control effect of the using length of the binding belt on the supporting block is achieved through the connection of the control rod and the pressing plate. And the angle limiting performance of the grouting pipe used on the connecting bin is improved.

The invention relates to the technical field of tunnel mining, and particularly discloses a highway tunnel karst cave cavity segmented plugging device and method.The highway tunnel karst cave cavity segmented plugging device comprises a pouring assembly and a sealing plate, the sealing plate is used for segmenting a karst cavity and achieving segmented plugging, and the top of the sealing plate is provided with a fixing piece used for fixing the sealing plate. The uniform spraying assemblies are arranged on the inner side and the upper portion of the sealing plate, the uniform spraying assemblies are used for uniformly spraying slurry for plugging to the inner wall of the karst cave, each uniform spraying assembly comprises a fixing pipe fixed to the inner side of the sealing plate, a rotating disc is arranged on the inner side of each fixing pipe, a lifting pipe is arranged in each rotating disc, and a rotating connector is installed at the top of each lifting pipe. Impact vibration caused by the fact that grout centrally falls on the bottom of the karst cave can be avoided, the possibility of collapse in the karst cave is reduced, the construction safety is improved, meanwhile, the adhesion between mortar and the inner wall of the karst cave during later grouting can be improved, and the firmness of mortar filling can be improved.

The invention discloses a method and a device for simplifying a numerical well testing geological model of a fracture-vug type oil and gas reservoir. The method comprises the steps that according to the radius of a karst cave in the fracture-vug type oil and gas reservoir and the distance between the karst cave and a test well, the bottom hole pressure derivative sinking amplitude caused by the karst cave is determined according to the corresponding relation between the bottom hole pressure derivative sinking amplitude caused by the karst cave and the corresponding relation between the karst cave radius and the distance between the karst cave and the test well; the sinking amplitude of the bottom hole pressure derivative is the sinking amplitude of the lowest point in a double logarithmic curve of the bottom hole pressure derivative and time relative to a set bottom hole pressure derivative baseline; and in the process of establishing the numerical well testing geologic model of the well testing, deleting the karst cave of which the sinking amplitude caused by the bottom hole pressure derivative is smaller than a set sinking amplitude threshold value. According to the method, the concept of the sinking amplitude of the bottom hole pressure derivative caused by the karst caves is innovatively defined, the karst caves are screened on the basis of the concept, and reasonable simplification of the numerical well testing geologic model of the fracture-vug type oil and gas reservoir is achieved.

The present invention discloses a method for preventing water inrush by grouting loosely filled caves in tunnels. By zoning and managing water-rich caves, the water-rich nature of the caves is classified according to the different water yields from geophysical exploration and drilling. Furthermore, grouting materials are selected based on the water pressure, water volume, and physical properties of the different water-rich zones. This method achieves targeted and clear grouting of water-rich caves in karst areas, eliminating the drawbacks of previous methods, such as unfounded material selection, unclear planning, and unsatisfactory management results. The present invention solves the problems of existing cave grouting reinforcement slurries, such as uneven diffusion, incomplete solidification, and significant damage from dynamic water scour.

This invention belongs to the field of karst cave treatment technology and discloses a method for detecting and treating karst caves in the anchor cable area of ​​a limestone stratum retaining structure. The method includes the following steps: S1, delineating the karst cave treatment area in the anchor cable area; S2, advanced drilling in the anchor cable area; S3, exploring the karst cave boundary in the anchor cable area; S4, grouting treatment of the karst cave in the anchor cable area; S5, detecting the grouting effect in the karst cave in the anchor cable area; S6, anchor cable construction and anchor cable bearing capacity testing. Through these six steps, the detection and treatment of karst caves in limestone areas can be effectively achieved, ensuring the stability of the anchor cables in the limestone stratum. This effectively reduces the risk of collapse of the anchor cables during the construction of the retaining structure, reduces the rapid development of karst caves under the disturbance of anchor cable construction, and reduces the risk of water inrush and gushing water. It also effectively improves the bearing capacity and deformation resistance of the anchor cable foundation pit support in limestone stratum retaining structures, and enhances the safety of underground structure construction.

This invention discloses a construction method for a large semi-filled karst cave in a karst tunnel. The method includes the following steps: first, applying wire mesh and shotcrete to the cavity area of ​​the karst cave wall for protection; then, installing grouting pipes on the tunnel face, surrounding rock, and non-cavity areas of the karst cave wall, and injecting cement-water glass double-liquid grout into the surrounding soil for reinforcement, ensuring the stability of the karst cave during construction, avoiding the formation of a large plastic zone during tunnel excavation, and simultaneously blocking water; filling the karst cave below the tunnel with slag, preserving the original karst pipes, and installing C20 concrete backfill and C35 reinforced concrete slabs across the karst cave to prevent uneven settlement of the tunnel; draining karst water in the karst cave section in two parts, relying on the original karst pipes and the tunnel drainage system respectively, to avoid excessive load on the tunnel support system due to excessive water pressure inside the karst cave; and adding a steel-framed concrete arch on the outside of the tunnel's initial support to prevent unstable falling rocks inside the karst cave from causing impact loads on the main tunnel support structure.

The invention discloses a fracture-vug type reservoir flow channel and karst cave structure inversion method, which comprises the following steps: S1, establishing an oil-gas-water three-phase multi-component flow mathematical model of a fracture-vug type reservoir, and obtaining a fracture-vug type reservoir fluid flow numerical simulation method; s2, constructing an inverse evolution volume space, and establishing a production dynamic fitting objective function; and S3, extracting multi-source data constraint information, and performing flow channel and karst cave structure inversion according to the multi-source data constraint information. The method has the beneficial effects that not only can the geometric structures of the flow channel and the karst cave in the fracture-vug type reservoir be explained, but also the flow attribute of the flow channel and the effective volume space of the karst cave can be explained, and the dynamic connectivity analysis of the flow channel and the karst cave structure in the fracture-vug type reservoir is realized; in addition, through interpretation of the flowing channel and the karst cave structure and attribute, a scientific basis can be provided for developers, and efficient development of the fracture-vug type oil and gas reservoir can be achieved.

The invention belongs to the technical field of karst cave treatment, and particularly relates to a limestone stratum soft filling large karst cave combined grouting reinforcement method. Aiming at the pure mud filling karst cave or the cohesive soil filling karst cave, the karst cave is reinforced in a combined mode of high-pressure rotary spraying and segmented grouting, high-pressure rotary spraying holes are formed in the edge of the karst cave, and segmented grouting holes are formed between the high-pressure rotary spraying holes; high-pressure jet grouting reinforcement is carried out firstly, and segmented grouting reinforcement is carried out after the high-pressure jet grouting reinforcement structure stands still and is stable; the homogenization of a filling body is realized through high-pressure jet grouting pretreatment, micro gaps are filled through grouting reinforcement, the uniformity and compactness of a consolidated body are remarkably improved, and the bearing capacity and the impermeability are superior to those of a single method; the problems that slurry is prone to layering when the karst cave is filled with pure slurry and soil of the karst cave filled with cohesive soil is difficult to break are solved, the uniformity of a consolidated body is improved, and the requirement for stability of a shield tunnel face is met. And the reinforcing effect (bearing capacity and impermeability) and the construction efficiency are both considered.

The invention discloses a joint characterization method and device for full-size pore size distribution of a deep carbonate gas reservoir. Performing CT scanning on the preprocessed rock sample to obtain a CT scanning image, and constructing a pore throat structure network model; micron-sized cracks and millimeter-sized karst caves in the model are extracted, and a first pore size distribution curve of the cracks and the karst caves is drawn; selecting a target rock sample with uniformly distributed pore throats, and dividing the target rock sample into a first sub-rock sample and a second sub-rock sample; performing a high-pressure mercury injection test on the first sub-rock sample, and drawing a second pore size distribution curve of the nanoscale pore throat; performing a constant-speed mercury injection test on the second sub-rock sample, and drawing a third pore size distribution curve of the micron-sized pore throat; and splicing and normalizing the pore size distribution curves, and drawing a full-size pore size distribution curve of the deep carbonate gas reservoir. According to the scheme, the defect that an existing oil and gas reservoir pore size distribution characterization method is poor in applicability in the deep carbonatite gas reservoir is overcome, and the precision and range of full-size pore size distribution characterization of the gas reservoir are effectively improved.

This invention discloses an auxiliary process for laying vertical buried pipes for shallow geothermal energy in karst areas, belonging to the field of vertical buried pipe technology. The process includes the following steps: detecting the distribution of karst caves in the vertical direction of the heat exchange hole, planning the grouting location of the karst caves, and the distribution of rammed earth and grouting layers in the heat exchange hole; lowering a U-shaped pipe through a ramming hammer, with the U-shaped pipe bend fixedly installed on an anchoring precast plate, to the bottom of the heat exchange hole; lowering the ramming hammer to the designed height of the first grouting layer, and starting grouting into the heat exchange hole; raising the ramming hammer to the designed height of the first rammed earth layer, releasing soil into the heat exchange hole, and repeatedly raising and lowering the ramming hammer to compact the soil; raising the ramming hammer to the designed height of the second grouting layer, and starting grouting into the heat exchange hole. This invention uses grouting layers to block karst caves in the heat exchange hole in karst areas, and the alternating distribution of grouting and rammed earth layers improves the heat exchange efficiency of the U-shaped pipe.

The present application relates to a kind of underground TBM disassembly cave construction method, the TBM disassembly cave includes TBM receiving cave, cutterhead main machine retreat cave, blasting buffer zone, TBM disassembly cave, TBM loading transport cave in turn by one end to the other end longitudinally, TBM disassembly cave includes lower step, middle step, upper step;Including the following steps: first TBM tunneling cave construction, second lower step blasting excavation support, third middle step blasting excavation support, finally lower step blasting excavation support, finally construction gantry crane rail foundation, install gantry crane inside the disassembly cave.This application changes the traditional drill and blast method bench method excavation sequence, and combines with shallow hole loose weak blasting, increases the blasting free surface, reduces the minimum resistance line, so as to reduce the shock wave and flying stone distance produced by blasting vibration, increase the protection to the lining structure of finished hole section, greatly improve the construction efficiency, construction risk is low, lay the foundation for the advance disassembly of TBM, with good economic benefit.

The present invention discloses a device for detecting karst caves in underground space construction, comprising a box body, a column fixedly connected to the upper side of the box body, at least three drilling devices arranged in a circular array at the upper ends of the columns, each drilling device comprising a multi-stage telescopic rod, the end of the multi-stage telescopic rod fixedly connected to a vertical rod, a slide groove provided on one side of the vertical rod, a slider slidably connected in the slide groove, a support plate fixedly connected to one side of the slider, the support plate rotatably connected to a drill pipe, the inner cavity of the drill pipe fixedly connected to a hollow tube, the lower end of the hollow tube threadedly connected to a drill bit or a protective cover, a sonar probe installed in the protective cover. The present invention uses at least three drilling devices, at least three drilling devices distributed at different positions with the box body as the center, and the multi-stage telescopic rod can be extended and retracted to change the drilling position, so that the detection coverage range is large, the selected position is first detected by ground penetrating radar to determine the depth of the karst cave, and then drilling is performed, and the selected drilling depth allows the sonar probe to enter the range of the karst cave.

The invention relates to the technical field of shield construction, and particularly discloses a shield construction device for detecting the filling type of a karst cave in a karst area penetrated by a tunnel, the shield construction device comprises a shield machine body and a cutterhead, a plurality of detection boxes are arranged on the cutterhead, sampling devices are arranged in the detection boxes, and a plurality of sliding grooves are formed in the side, facing the cutterhead, of the shield machine body. A sliding seat is connected in each sliding groove in a sliding manner, a telescopic plug-in type driving device is mounted on each sliding seat, the telescopic plug-in type driving devices correspond to and are matched with the sampling devices one by one, a guide groove is formed in the detection box, and the sampling devices can slide along the guide groove. The shield tunneling machine has the beneficial effects that the detection device is arranged on the annular surface of the cutter head of the shield tunneling machine, detection sampling can be carried out on filler in a karst cave which a tunnel does not pass through, after detection sampling is finished, a steel reinforcement framework can be pushed into a pit hole left after sampling is finished, the steel reinforcement framework and injected slurry form a whole, and the construction efficiency is improved. And the reinforcing strength can be greatly improved.

The present application belongs to the technical field of oil and gas well drilling, and particularly relates to an experimental device and method for simulating overflow and leakage coexisting well killing process of fracture-cave type stratum. The device comprises a simulated wellbore system, a simulated drilling fluid circulation system, a simulated fracture-cave type stratum structure system, a simulated gas injection system, a data acquisition system and a data processing system. The simulated wellbore system is used for simulating the drill string and the wellbore in the experiment. The simulated drilling fluid circulation system is connected with the upper part of the wellbore system and is used for simulating the injection and return of the drilling fluid. The simulated fracture-cave type stratum structure system is connected with the lower part of the wellbore system and is used for simulating the fractures and the caves in the experiment. The simulated gas injection system is used for injecting gas into the fracture-cave type stratum structure system. The data acquisition system and the data processing system are used for collecting and processing the experimental data in the experimental device. The experimental device and method provided by the present application aim to solve the problem that the prior art cannot comprehensively simulate the overflow and leakage coexisting well killing process of the fracture-cave type stratum.

The utility model relates to the technical field of karst cave treatment, in particular to a karst cave treatment device used in pile foundation construction, which comprises a movable support frame, a slurry stirring structure is clamped and embedded on the movable support frame, and a slurry flow increasing pressure structure is arranged on one side of the slurry stirring structure. The slurry flow increasing pressure structure comprises a compressed air tank, an air compressor, an exhaust pipe and a ball valve adjusting switch, the air compressor comprises a compression cavity, a rapid reciprocating telescopic rod, a compression sliding plug and an air inlet groove hole which are arranged side by side, the bottom of the slurry stirring structure is communicated with a slurry discharging pipe, and the tail end of the exhaust pipe is connected with the slurry discharging pipe. According to the utility model, pressurization, storage and one-way discharge of air can be integrated through the slurry flow-increasing pressure structure, so that compressed air does not need to be supplemented from the outside during operation during long-time operation, the preparation work before the device is used is simple, and workers can use the device in different operation places conveniently.

The utility model discloses a kind of closed construction framework and prefabricated mould device for multilayer karst geology pile foundation, comprising: pile hole structure;Tool steel casing, positioning setting in the pile hole structure;Prefabricated closed ring assembly is provided with several groups of prefabricated closed ring;Several groups of prefabricated closed ring are all located inside the pile hole structure, and several groups of prefabricated closed ring are based on the tool steel casing and sequentially adjustable long type joint connection setting.Solved the technical problem that permanent steel casing follows and fills in when carrying out pile foundation construction in the prior art for the karst cave deeper and the geological of multiple karst caves in string-bead type layered distribution.

The application belongs to the field of karst cave detection, and specifically discloses a device and a method for detecting the edge of an underground karst cave, which comprises a supporting rod, a fixed seat arranged at the lower end of the supporting rod, a first probe arranged on the bottom surface of the fixed seat, a plurality of telescopic rods circumferentially hinged to the fixed seat, a second probe arranged at the distal end of each telescopic rod, a magnet block arranged above the telescopic rods on the fixed seat, a driving motor detachably connected to the upper end of the supporting rod, and the driving motor drives the supporting rod to rotate at a gradually increasing rotating speed, the telescopic rods first rotate in a horizontal state and are attracted by the magnet block in the process of increasing the rotating speed, and then the telescopic rods are in an elongated state and drive the second probe to approach the edge of the karst cave as the rotating speed continues to increase. The device detects and samples the internal structure of the karst cave in the form of photographing, can detect the detail area of the side wall of the karst cave at the same time, is convenient for analyzing the structural features of the karst cave, and is more conducive to determining the amount of filling material.

The application discloses a kind of pile foundation karst cave rapid leak stoppage method, belong to the field of pile foundation construction in geotechnical engineering.The method is aimed at the technical problems such as mud loss when pile foundation drilling hole meets fissure or karst cave in karst area, traditional method is high in cost, low in efficiency, a kind of fast and efficient leak stoppage scheme is presented.The core is that: in ground, sulphoaluminate fast hardening cement blanket is connected by magic tape at the beginning and end, and is prefabricated into sleeve structure wrapped annular hydraulic water bag;The whole pre-assembled body is lowered to the leakage passage in the pile hole;Water is filled into the water bag to make it expand radially, and the magic tape is opened, so that the cement blanket is pressed tightly on the side wall of the pile hole and covers the leakage passage;Maintain water bag support until cement blanket solidifies to form a wall.The method integrates detection, prefabrication and overall construction, realizes the accurate positioning and rapid curing of leak stoppage material, significantly improves the construction efficiency, success rate and reliability, and greatly reduces the treatment cost.