571 results about "Pressure grouting" patented technology

The anchor rod comprises a hollow rod body, a grouting channel is formed in the hollow rod body, and multiple sets of through grooves are evenly distributed in the peripheral side of the hollow rod body; the driving unit comprises a top shaft movably arranged in the hollow rod body, the axis of the top shaft is overlapped with the axis of the hollow rod body, the clamping arms are movably arranged in the corresponding through grooves, a top plate is fixedly arranged at one end of the top shaft, and the end, away from the top shaft, of the top plate is located on the outer side of the end of the hollow rod body; wedge-shaped blocks with the number corresponding to that of the multiple sets of clamping arms are fixedly arranged on the peripheral side of the top shaft, and the multiple sets of clamping arms extend out of the hollow rod body under the action of the corresponding wedge-shaped blocks. The through grooves evenly distributed in the peripheral side of the hollow rod body are matched with the clamping arms, when the anchor rod is installed, the clamping arms extend out of the hollow rod body under the action of the wedge-shaped blocks, the clamping arms can disperse and resist external force from different angles, and compared with a traditional anchor rod with the single anchoring direction, pulling resistance can be more effectively provided, and the stability of the anchor rod under the complex stress condition is enhanced.

The invention relates to the technical field of fracturing engineering safety monitoring and intelligent early warning, in particular to a fracturing construction monitoring and early warning system and method, and the method comprises the steps: obtaining initial equivalent system resistance and a flow state correction index; constructing a reference physical model; calculating a theoretical pressure value; calculating a deviation index; when the deviation index is larger than a preset dynamic judgment threshold value, geological state inversion is triggered; if the deviation index is smaller than or equal to the dynamic judgment threshold value, returning to the step of collecting the current real-time pressure value and the current real-time displacement value of the high-pressure grouting pump in real time; carrying out reverse solving to obtain updated equivalent system resistance; calculating to obtain a risk index; generating a grading early warning and decision instruction; in response to early warning event confirmation, the initialized equivalent system resistance in the reference physical model is updated to the updated equivalent system resistance; according to the invention, automation and intelligence of early warning and decision making are realized, the construction safety is ensured, and the engineering quality is improved.

The invention belongs to the technical field of karst geology bridge foundation construction and foundation treatment, and discloses a strong development karst geology bridge pile foundation grading treatment and composite pile forming construction method, which realizes on-demand treatment and grading construction through advanced geological detection and karst grade division and reasonable selection of construction modes according to different karst cave types. The problems of material waste and excessive grouting caused by construction are effectively avoided; a conventional cast-in-place pile is directly adopted in a micro-pore area, the process is simplified, and the cost is saved; for isolated karst caves and through karst caves, low-pressure grouting and synchronous pouring are designed correspondingly, the treatment difficulty is lowered, and the field resource utilization rate is increased; the construction method has extremely high field adaptability, can flexibly deal with complex and changeable karst structures, effectively realizes segmented independent grouting by adopting a multi-segment isolation guide pipe structure and combining with an intelligent grouting-pouring synchronous control system, and prevents slurry streaming or concrete loss between different construction depths.

The invention provides high-pressure grouting and water plugging equipment for tunnel boring, and relates to the technical field of grouting and water plugging. Comprising a hollow anchor rod body, one end of the hollow anchor rod body is fixedly provided with a steel expansion-shell anchor head, the other end of the hollow anchor rod body is rotationally sleeved with a stop-grouting plug, the outer surface of the stop-grouting plug is fixedly provided with a base plate, and the side, away from the steel expansion-shell anchor head, of the base plate is provided with a nut which is in threaded connection with the outer surface of the hollow anchor rod body; a partition assembly is arranged outside the hollow anchor rod body and comprises a supporting rod and an annular baffle. Rock mass fractures existing in the grouting and water plugging operation process are plugged through the arrangement of the supporting rods and the annular baffles, the annular baffles can limit the diffusion range of grout, the grouting pressure is made to act on the interior of a drill hole more intensively, meanwhile, the annular baffles can prevent the grout from losing towards the area where grouting is not needed, and the grouting efficiency is improved. It is ensured that more grout enters the target drill hole, so that the utilization rate of the grout is increased, and waste of the grout is reduced.

The invention relates to the technical field of tunnel construction, in particular to an advanced pipe shed high-pressure control grouting device and method. The advanced pipe shed high-pressure control grouting device comprises a grouting pipe shed, a grout stopping device and a grout stopping grouting pipe, the grout stopping device is a film bag woven by fiber cloth and wraps the periphery of at least part of pipe sections of the grouting pipe shed, and the length of the grout stopping device in the length direction of the grouting pipe shed is larger than the thickness of a pipe shed guide wall. The grouting stopping device can partially extend into the surrounding rock drill hole through the pipe shed guide wall; the grout stopping and injecting pipe is connected with the grout stopping device and used for injecting grout into the grout stopping device so that the injected grout can extrude the rock wall of the surrounding rock drill hole to achieve the grout stopping effect. In this way, the grouting pressure of the grouting pipe shed can be increased, high-pressure grouting is achieved, the grouting pipe shed can be fully coupled with the rock wall of the surrounding rock drill hole, the bonding strength of the grouting pipe shed and the surrounding rock is improved, the aim of conducting advanced pre-reinforcement on the surrounding rock is achieved, construction is easy and fast, and safety is high.

The invention discloses a fractured rock mass permeation-splitting grouting simulation method and system, and relates to the technical field of grouting simulation methods.The simulation method comprises the steps that a fractured rock mass model is built, and model parameters are set; solving the phase fraction equation to obtain the two-phase fraction of the slurry interface; solving the transmission time tracking equation, and combining with the slurry time-varying curve to obtain a slurry viscosity field; whether the slurry pressure reaches the set splitting pressure or not is judged, and if not, solving is conducted according to the permeation model; if the splitting pressure is reached, the splitting pressure is solved; continuously updating the slurry velocity field and the slurry pressure field until the grouting termination time is reached, and completing the permeation-splitting grouting simulation of the fractured rock mass; according to the method, the slurry permeation process is described on the basis of a Darcy-Blackman method, the rock mass splitting grouting process is described by adopting a viscoplastic constitutive fusion fluid volume method, and therefore the rock mass splitting and slurry flowing process in the fractured rock mass high-pressure grouting process is described.

The invention relates to the technical field of geotechnical engineering, and discloses a grouting test system capable of controlling a dynamic water environment and a fracture geometric structure, which comprises a grouting module, a fracture geometric structure control module, a dynamic water control module and a data acquisition module, the grouting module is connected with the fracture geometric structure control module through a grouting pipe; the flowing water control module is connected with the fracture geometric structure control module through a water injection pipe, and the grouting module is used for achieving stable-pressure grouting in the fracture geometric structure control module. Through the combined design of the electric spiral elevator and the 3D printing rough fracture plate, flexible adjustment of fracture width, inclination angle and roughness is realized, rock fractures in different geometric forms can be simulated, the test bed is made of a transparent material, and the diffusion process of slurry in the fractures can be clearly observed in combination with a high-resolution image acquisition device.

The invention discloses a water gushing roadway curtain grouting construction method integrating a retention wall and grouting, which comprises the following steps: step 1, analyzing mine production layout and hydrogeological conditions according to known geological data of a coal mine goaf and a production area, and determining a water gushing roadway needing curtain grouting construction; secondly, a slurry blocking wall is built, the slurry blocking wall is arranged in the middle of the underground roadway or close to the intersection of the main roadway, and the relation between a lower coal roadway and a normal production roadway is cut off; thirdly, grouting filling is conducted on the roadway space through underground grouting filling and ground branch hole exposed coal roadway grouting filling, and grout filling is conducted on the roadway space; 4, construction branch holes are drilled along a top plate and a bottom plate of the roadway, high-pressure grouting is conducted to reinforce the top plate and the bottom plate, and a surrounding rock loose circle and top plate and bottom plate cracks are filled; the curtain grouting construction scheme integrating the retention wall and grouting is adopted, the waterproof and waterproof effect is improved, and the stability of the roadway is also enhanced.

The invention relates to the technical field of geotechnical engineering, and discloses a single-fracture high-pressure grouting test system capable of simulating various grout properties, which comprises a high-pressure grouting module, a grout type control module, a visual single-fracture permeation module and a data acquisition module. The high-pressure grouting module comprises a pressure slurry storage tank for storing slurry and a pressure adjusting module; a slurry outlet of the pressure slurry storage tank is connected with a liquid inlet of the visual single-fracture permeation module; and the pressure adjusting module is used for adjusting the size of the slurry outlet pressure of the pressure slurry storage tank. According to the invention, cement, water and different admixtures are separated by different chambers, so that different types of slurry are prepared, the slurry type control device is simple and more accurate to use, and the migration process of various types of slurry in cracks can be simulated.

The invention provides a structure and method for reinforcing a loose soil slope based on a steel floral tube anchor rod, and the structure for reinforcing the loose soil slope based on the steel floral tube anchor rod comprises a steel floral tube anchor rod anchoring system, a frame beam system and an auxiliary system; a method for reinforcing a loose soil slope based on a steel floral tube anchor rod comprises the following steps that drilling is conducted along with a pipe, specifically, a steel floral tube serves as a sleeve to be drilled into a loose soil body of the slope, and a drill hole is formed synchronously; mounting an anchor rod, and inserting the anchor rod into the steel floral tube; performing high-pressure grouting to form a grouting body, and forming a composite reinforcing body by the grouting body, the anchor rod, the steel floral tube and the soil body; checking and accepting the anchor rod; constructing a frame beam, and erecting a formwork and pouring concrete to form a frame beam grid; and auxiliary system construction is carried out, and construction of the water retaining edge, the surface protection layer and the slope toe protection structure is completed synchronously. According to the method, efficient hole forming in the unconsolidated formation is achieved, grouting compactness is ensured, and a stable anchoring interface is constructed.

The invention relates to the technical field of bridge construction, and provides a broken geological slope belt cable crane main anchorage and an anchor cable construction method.The main anchorage is arranged on slope zones on the two sides of an arch bridge and comprises an anchor beam, a plurality of anchor cables and a plurality of anchorage piers cast-in-place on a slope excavation platform, and the backs of the anchorage piers are obliquely arranged; each anchor beam is arranged between every two adjacent anchor piers, one end of each anchor cable is anchored in deep bed rock of the broken geological slope zone, and the other end of each anchor cable is connected with the corresponding anchor pier; aiming at a mountain slope zone with broken geology, the main anchorage adopts a pre-stress anti-pulling structure, so that large-volume excavation of a gravity type anchorage on a rock mass is avoided, the anchor cable can directly penetrate through a poor stratum by adopting a drilling sleeve follow-up technology, the hole forming difficulty is reduced, and the construction efficiency is improved. The effect of reinforcing the mountain of the broken layer on the back face of the main anchorage is further achieved by adopting a sealing structure for sealing pressure grouting, the integrity and the stress performance of the broken layer are improved, and the situation that the uplift resistance of the main anchorage is affected due to extrusion deformation of the mountain is prevented.

The invention relates to the technical field of tunnel construction equipment, and discloses compact grouting equipment for tunnel construction, which comprises a tunnel vehicle, a storage barrel and a stirring barrel system, by arranging a linkage structure of the distribution part and the stirring driving part, when a screw rod in an auger shell is used for conveying materials, meshing transmission of a main gear and an N ring is synchronously driven, a stirring rod in a storage barrel and a stirring barrel disturbing plate magnetically connected with the stirring rod are driven to conduct bidirectional stirring, and cooperative driving of automatic material matching and conveying and stirring power is achieved. The dredging part is linked with an elastic rod through an electric rod to form an elastic knocking mechanism, and cooperates with an inclined push plate to drive a hammer rod to perform reciprocating impact on the connecting pipe, so that slurry solidification and blockage are effectively prevented. The equipment innovatively adopts a gear transmission and magnetic linkage technology, realizes integration of functions of material delivery, stirring disturbance and pipeline dredging while removing a traditional stirring motor, remarkably reduces the overall height of the equipment, improves the trafficability of a narrow tunnel working condition, and ensures the accuracy of mortar proportioning.

The invention relates to the technical field of grouting anchoring, and particularly discloses a double-liquid-bag grouting anchor pipe device capable of expanding and temporarily plugging and a construction method. The construction method comprises the steps that S1, a hole is formed, and a double-liquid-bag grouting anchor pipe is placed in the hole; s2, filling fluid to enable the first capsule body and the second capsule body to expand; s3, high-pressure grouting is conducted; and S4, solidifying the slurry and fixing the tail tray. The double-liquid-bag grouting anchor pipe device comprises a double-liquid-bag hollow grouting anchor pipe, a first bag body, a second bag body, a metal shell protection strip, a slurry outlet, a front end side bag body liquid filling channel, a tail end side bag body liquid filling channel, a pressure-resistant ball valve and the like. The scheme can be suitable for different geological environments, operation is easy and convenient, the construction efficiency and the engineering quality are high, the grouting pressure can be effectively improved through the high-pressure grouting technology, durability and stability are enhanced, stress balance in the grouting process can be ensured through the double-bag-body structure, displacement of the anchor pipe is avoided, the overall anchoring effect is optimized, and the construction period is shortened. And the method can be suitable for multiple scenes including tunnel surrounding rock reinforcement and water-rich soft foundation treatment, and is high in adaptability.

The utility model provides a length-adjustable high-pressure grouting pipe, which belongs to the technical field of high-pressure grouting pipes, and comprises a main pipeline, a corrugated pipeline communicated with the outlet end of the main pipeline, an end pipeline communicated with the outlet end of the corrugated pipeline, a steel wire mesh wrapped on the outer side of the corrugated pipeline, and a fixing plate, the fixing plates are fixedly arranged at the ends, close to each other, of the main pipeline and the end pipeline in a sleeving mode. One end of the guide rod is fixedly arranged on the fixing plate on one side, and the other end of the guide rod penetrates through the fixing plate on the other side; the corrugated pipeline is sleeved with the multiple positioning rings, the multiple positioning rings are arranged at the folding protruding positions of the corrugated pipeline in a one-to-one correspondence mode, and the positioning rings are arranged on the guide rods in a sliding mode; each positioning ring is provided with a V-shaped elastic piece, one end of each V-shaped elastic piece is fixedly arranged on the corresponding positioning ring, and the other end of each V-shaped elastic piece is fixedly arranged on the steel wire mesh. According to the utility model, the length of the high-pressure grouting pipe can be conveniently adjusted on the basis of ensuring that the telescopic part of the grouting pipe is not easy to deform and damage.

The invention discloses a high-bearing-capacity formed spiral anchor foundation and a construction technology, and relates to the technical field of spiral anchor foundations, the high-bearing-capacity formed spiral anchor foundation comprises a hollow anchor rod, at least one spiral anchor disc and a plurality of grouting holes, the spiral anchor disc and the grouting holes are arranged on the lower section of the anchor rod, a pressing disc structure is coaxially arranged on the middle section of the anchor rod, and the diameter of the pressing disc structure is basically equal to that of the spiral anchor disc; and the pressure plate structure is used for compacting soil around the anchor rod in the process of screwing the anchor rod into the ground. In the process that the middle section of the anchor rod is screwed into the ground, the pressing disc structure compacts soil around the anchor rod disturbed by the spiral anchor disc, the uplift bearing capacity is improved, in the later stage, through the high-pressure grouting stage of the anchor rod, cement paste cannot uprush from the high-compactness soil in the spiral anchor disc and around the anchor rod, and the uplift bearing capacity is improved. The high-bearing forming spiral anchor foundation can only uprush to the ground from soil which is far away from the anchor rod and is relatively low in compactness, so that the cement paste is fully injected into the underground soil, the paste wrapping range is wide, the grouting effect is good, and the bearing capacity, especially the horizontal bearing capacity, of the high-bearing forming spiral anchor foundation is remarkably improved.

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

The utility model relates to the technical field of spiral pressure grouting pile drilling, in particular to a spiral hole-forming drill bit suitable for a soil body containing a soft soil layer, which comprises a long spiral drill rod and a protective plate assembly, the long spiral drill rod comprises a drill rod main body and a spiral blade which are controlled to rotate, and a through material channel is formed in the drill rod main body along the axial direction of the drill rod main body. According to the spiral hole-forming drill bit suitable for the soil body containing the soft soil layer, the arc-shaped protection plates are arranged in pairs and symmetrically installed on the two sides of the drill rod body respectively, the protection plate assemblies can form a cylindrical surface when the drill rod body rotates, the cylindrical surface abuts against the inner wall of a drill hole, and therefore the effective supporting and protection effects are provided in the drilling process; the problem that the hole diameter does not meet the design requirement due to collapse of the hole wall is solved, sludge scraped off by the arc-shaped protection plate can be sent out of the drilled hole through the spiral blade through cooperation of the spiral blade, the sludge on the hole wall is effectively prevented from being mixed into concrete, and the bearing capacity of the pile body is guaranteed.

The invention discloses a ground surface settlement prevention and control method based on mold bag grouting. The ground surface settlement prevention and control method comprises the following steps that geological investigation is conducted, and pile positions are arranged; drilling at the pile position to form a pile hole; the method further comprises the following steps that the main grouting pipe and the geotextile bag on the main grouting pipe are placed into the pile hole together, and backfilling is conducted between the pile hole and the main grouting pipe; pressure grouting is conducted in the main grouting pipe, the grout in the main grouting pipe rises gradually, meanwhile, the grout in the main grouting pipe is pressed into the geotextile mold bag through the secondary grouting pipe, and the geotextile mold bag expands gradually in the radial direction and extrudes the surrounding soil body; and grouting is stopped, and after the grout in the main grouting pipe and the soil engineering mold bag is hardened, the main grouting pipe and the soil engineering mold bag jointly form a mold bag pile body. The construction method has the beneficial effects that the grouting pipes are arranged underground, the expandable mold bags are installed at the preset positions of the grouting pipes, after grout is injected, the mold bags expand directionally and evenly extrude the surrounding soil body, and therefore active compaction of the soil body is achieved, and the rigidity and integrity of a foundation are remarkably improved.

The present invention relates to the technical field of mine grouting construction, specifically to an underground high-pressure grouting filling and solidifying device and method for a gold mine, including a mortar system configured on the mine surface, a grouting filling system configured underground in the mine, and a pumping system that connects the mortar system and the grouting filling system and pumps the mortar under high pressure. The grouting filling system is a grouting filling robot, which includes a wheeled or tracked vehicle platform, a filling tank configured on the vehicle platform, a mortar output module for pressurizing and pumping out the mortar in the filling tank, and a grouting filling module that is connected to the mortar output module and can pump out the mortar under high pressure and inject it into a pre-drilled hole directionally. By setting a rotary servo, a swing rod, a lead screw, and a camera, the present invention can monitor the drilling position in real time, automatically adjust the grouting filling module, achieve high-precision control of underground grouting, and reduce the intervention of manual operation at the same time.

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

The invention discloses a grouting and water plugging method for a working face of a vertical shaft, and belongs to the technical field of water disaster treatment, prevention and control of an ultra-deep vertical shaft of a water-rich rock stratum. The method comprises the following steps: firstly, establishing a conceptual model of a storage water area-main water guide channel and pore and fracture surrounding rock coexistence area-pore and fracture surrounding rock area; according to the space relative position relation between the shaft and the main water guide channel, if the shaft intersects with the main water guide channel, pressure grouting is directly carried out, if the shaft is separated from the main water guide channel, according to the space relative position relation between the drill hole and the main water guide channel, intersection or separation working conditions are abstracted, and direct pressure grouting or hydraulic fracturing and grouting are respectively carried out. According to the method, on the basis of the main water guide channel theory and the flow conservation principle of a water storage area-main water guide channel and hole fracture surrounding rock coexistence area-hole fracture surrounding rock area, a working face grouting plugging operation area is expanded to the near-field range of the shaft from the limited range around the shaft, and an innovative solution is provided for deep well working face water disaster prevention and control.

The invention discloses a device and method for preventing soft coal seam gas extraction drill hole deformation and hole collapse, and relates to the technical field of coal seam gas extraction, the device comprises an anti-collapse mechanism used for ensuring the accuracy and controllability of the reinforcing range and effectively preventing invalid slurry loss, and the anti-collapse mechanism comprises a hole protection sleeve unit, a connecting unit and a bag unit; the bag unit is arranged on the outer side of the connecting unit and comprises a stacked bag installed on the outer side of the stacked casing pipe through the connecting unit, a bottom bag is installed on the outer side of the bottom casing pipe through the connecting unit, and high-strength grout is injected into the bag unit through a high-pressure grouting pump, so that the stacked bag and the bottom bag expand in a drill hole to fill surrounding cracks; and the invalid diffusion path of the slurry is blocked, targeted reinforcement of the soft coal seam is achieved, the problem that the slurry is lost along the maximum crack channel in traditional grouting is solved, the stability of the gas extraction drill hole is remarkably improved, and the service life of the gas extraction drill hole is remarkably prolonged.

The invention relates to the technical field of grouting, in particular to a multifunctional gradient grouting device and a grouting method. The multifunctional gradient grouting device comprises a grouting assembly and a mud jacking assembly, the grouting assembly comprises a grouting pipe, a grouting zoning mechanism, a plurality of annular mud blocking plugs and a plurality of grouting guide pipes, the grouting zoning mechanism is arranged in the grouting pipe, the interior of the grouting pipe is divided into a plurality of grouting channels extending in the length direction of the grouting pipe through the grouting zoning mechanism, and the annular mud blocking plugs are arranged in the grouting channels. And a plurality of grouting hole groups are formed in the peripheral surface of the grouting pipe. The multifunctional gradient grouting device integrates multiple functions, solves the problems that an existing grouting mode is single in grouting type and pressure, and can achieve simultaneous grouting, segmented grouting, layered grouting and gradient grouting of multiple types of grout under multiple pressures so as to repair cracks of an injected body in a targeted mode, reinforce and modify the injected body, improve the grouting efficiency and improve the grouting quality. And a'deep and shallow hole high-low pressure grouting 'process can be realized at the same time, procedures can be simplified, the construction cost is reduced, and the construction efficiency is improved.

The invention discloses a quick plugging method for coal mine floor drill hole water inrush, and belongs to the technical field of coal mine water disaster prevention and control. According to the method, the mode of combining long holes and short holes is adopted, the high-pressure grouting technology is adopted, the plugging material specially prepared according to the water inrush condition is prepared, and rapid and accurate plugging of the water inrush point is achieved; comprising the following steps: 1, drilling and positioning; 2, detecting a water inrush point; 3, preparing a plugging material; fourthly, high-pressure grouting is conducted; and 5, monitoring and evaluating the plugging effect. The method mainly aims at eliminating water leakage points of the bottom plate and blocking ordovician limestone hole gushing water, firstly, the short hole is adopted for blocking and treating the area, with the large water leakage amount, of the bottom plate, then the long hole is adopted for conducting full-hole blocking on the ordovician limestone drainage hole, and bottom plate gushing water is treated in a staged and step-by-step mode.

The invention provides a grouting-curing-intercepting cross-cut rapid coal uncovering method, and relates to the technical field of cross-cut coal uncovering. The method comprises the steps that drilling topological mapping is conducted on a target area, a connected gas interception and extraction network is constructed, and gas attenuation characteristics are extracted to determine a grouting permeation resistance coefficient; then, a high-pressure grouting dynamic pressurization gradient sequence is formulated, and an in-situ test execution unit is configured in a negative pressure guide reserved area; establishing a process response state diagram containing bag strength, sieve tube smoothness and crack filling test nodes, generating an optimal grouting path by adopting closed-loop feedback logic, and collecting a multiphase flow grouting response data set; and finally, generating a complete solidification curtain map by using the data set, executing a solidification-gas interception collaborative verification decision, and outputting a safe coal uncovering instruction. By means of digital closed-loop control, accurate solidification of superfine cement on coal seam microcracks and efficient interception and extraction of gas are achieved, and the safety and operation efficiency of cross-cut coal uncovering are remarkably improved.

The present invention belongs to the technical field of karst geological bridge foundation construction and foundation treatment, and discloses a method for graded treatment and composite pile construction of bridge pile foundations in strongly developed karst geological conditions. Through advanced geological exploration and karst grade classification, construction methods are reasonably selected for different cave types to achieve on-demand treatment and graded construction, effectively avoiding material waste and excessive grouting caused by construction; conventional bored piles are directly used for areas with tiny pores to simplify the process and save costs; low-pressure grouting and synchronous grouting are designed for isolated caves and through caves respectively to reduce treatment difficulty and improve on-site resource utilization; this method has extremely strong on-site adaptability and can flexibly cope with complex and changeable karst structures. By adopting a multi-segment isolation conduit structure and combining it with an intelligent grouting-grouting synchronous control system, segmented independent grouting is effectively achieved to prevent slurry cross-flow or concrete loss between different construction depths.

The invention relates to the technical field of settlement post-cast strips, in particular to a pre-closed advanced water stop grouting device and method.The pre-closed advanced water stop grouting device comprises a basement top plate, a bottom plate, a cover plate and a grouting sleeve and further comprises a self-adaptive adjusting assembly; the self-adaptive adjusting assembly comprises an inner cylinder, an outer cylinder, a spring, a sealing ring and a pre-tightening force adjusting component, and when the building body settles, the cover plate descends to drive the outer cylinder to descend, and then the spring is extruded; the springs on the two sides generate reverse buffering force after being compressed, the force is transmitted to the cover plate through the outer cylinder, the internal stress of the cover plate caused by differential settlement is effectively counteracted, and it is avoided that a sealing structure at the joint of the cover plate and a basement top plate cracks due to rigid pulling; and after the settlement is stable, pressure grouting is performed through the grouting sleeve, so that the problems of cracking of the cover plate and failure of sealing structures such as a sealant and a waterproof coiled material due to rigid pulling are solved.

The invention belongs to the crossing field of the field of mine water disaster prevention and control and the field of mining engineering, and particularly discloses an underground high-pressure-bearing weak water-rich aquifer grouting method which comprises the following steps: implementing associated drilling; a main grouting hole is formed; forming a water distributing and discharging hole; water pressure monitoring devices and ball valves capable of adjusting the water discharge amount are arranged at orifices of the branch water discharge holes and the main grouting holes; a high-pressure blowout preventer and a closed drainage system are mounted at the opening of the water distribution and drainage hole; a high-pressure grouting system is connected to the opening of the main grouting hole; main grouting holes are formed in the high-pressure-bearing weak water-rich aquifer; opening a water distributing and discharging hole ball valve to discharge water, and continuously monitoring the water pressure; grouting and hole sealing are conducted on the associated drill holes; opening a main grouting hole orifice ball valve, and starting a high-pressure grouting system. The grouting method for the underground high-pressure-bearing weak water-rich aquifer is more scientific, accurate, practical and easy to implement, and can meet the urgent requirements of mine safety production and geological disaster prevention and control.

This invention provides a directional filling device for seepage channels in dikes, comprising a main mounting frame, a fixed connecting seat fixedly mounted at the bottom of the main mounting frame, a central connecting rod fixedly mounted at the lower end of the fixed connecting seat, and a detection drive seat fixedly mounted at the lower end of the central connecting rod. The detection drive seat has an outward-opening detection installation cavity at its bottom, and a movable detector lifting seat is located within the detection installation cavity. This invention integrates a geological detection sensor and a lifting drive mechanism to achieve simultaneous exploration and filling, accurately identifying the geometric parameters of the seepage channel and directional filling along the channel's centerline, avoiding blind grouting and material waste. This invention employs a bag-type sealing mechanism to first isolate the section to be filled into a closed cavity before low-pressure grouting, eliminating the need to rely on material expansion force to split the soil and avoiding secondary disturbance to the dike body. It is particularly suitable for the reinforcement of dikes with defects.

The application relates to a post-poured concrete construction method for a column of an underground vertical structure by a reverse construction method, and particularly relates to the following steps: constructing a column head, installing longitudinal steel bars of a column body and a high-pressure grouting pipe; installing other structural steel bars; setting a mortar reverse ridge; installing a column body formwork and a supporting system, setting a vibrating hole and an exhaust hole; installing a concrete discharging pipe, setting a vibrating hole for vibration; after the vibrating hole at the top of the column body is closed, mainly performing concrete vibration through a concrete pouring opening of the last layer and the vibrating hole; performing non-pressure water test on the grouting pipe; curing the concrete, removing the formwork; performing ultrasonic detection on a construction joint interface position; performing high-pressure grouting; performing ultrasonic detection on the construction joint interface again; constructing the column body; closing a floor hole opening by the reverse construction method, and removing temporary supports one by one. The application has the advantages that the concrete is fully vibrated, the vibration efficiency is high, gas in the construction joint position is fully discharged, two construction joints are not generated, the construction cost is low, and the filling material at the construction joint position is safe and reliable.