430 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 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 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 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 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.

The present application provides a monitoring and early warning method and device for pilot hole construction in soft rock mudstone formations, which relates to the field of mining engineering technology, including: constructing a profile of the mine stratum distribution to determine the pilot hole construction location; conducting pilot hole construction, collecting the borehole backflow status in real time, and performing mud feature analysis and backflow color collection; if the mud feature meets the predetermined mud feature or the backflow image meets the predetermined mudstone color, it is determined that the construction has reached the soft rock mudstone formation, and high-pressure water is injected into the pilot hole to form a cavity; the cavity meets the predetermined size constraint, grouting is injected into the cavity, and after filling, the pilot hole is continuously constructed until the construction is completed. The present application can solve the technical problem in the prior art that the pilot hole construction has safety risks due to the characteristics of the soft rock mudstone formation. By performing high-pressure grouting on the soft rock mudstone formation, problems such as hole blockage and pipe burial can be effectively avoided, thereby reducing the safety risks during the construction process and improving construction efficiency.

The present application belongs to the technical field of high-pressure grouting process optimization, and particularly relates to a high-pressure grouting process optimization method for roadway water inrush cracks. The method first improves the Retinex and dark channel priori combination for image preprocessing; based on the attention-enhanced U-Net, the crack is accurately segmented, and the length, width and depth are quantified; the distributed water pressure sensor is arranged in the crack influence area, the Gaussian smoothing, sliding window linear fitting and correlation analysis are used to remove the abnormal measuring points and calculate the weighted average water pressure; taking the crack geometry and effective average water pressure as the input, a double-branch prediction model is constructed to output the preliminary range of slurry-water ratio, grouting pressure and segmented grouting length; further, a neural network prediction model is constructed from the similar working conditions selected from historical samples, and the improved particle swarm optimization is combined to repair the longitudinal wave velocity of the post-rock mass close to the normal value as the target, and the three types of process parameters are optimized to obtain the optimal grouting scheme.

A boulder pile foundation construction method comprises the following steps that boulder detection is conducted, specifically, a detection hole is drilled in a preset pile foundation point position, and whether boulders exist or not is judged; and if the boulders are detected, auxiliary detection holes are formed in the peripheral side of the preset pile foundation point position to detect boulder boundaries. Selecting a pile foundation type: if no boulder exists at a preset pile foundation point position, constructing a rotary excavating pile; if the boulder exists at the preset pile foundation point position and the auxiliary detection hole is still the boulder stratum, it is judged that the boulder can be penetrated, and separate pile construction is conducted; and if no boulder exists in the auxiliary detection hole, the preset pile foundation point position is moved, and the rotary excavating pile is constructed after the boulder is avoided. Sub-piles distributed in a radial shape are constructed at preset pile foundation points capable of penetrating through the boulder, and it is ensured that the sub-piles penetrate through different areas of the boulder through positioning; and the anchor rod is lowered after drilling, and the anchor rod is anchored with boulders and stratums through pressure grouting. Mounting and primary pouring of a steel sleeve: after pile-dividing grouting and primary setting, treating the top of the anchor rod, sleeving the steel sleeve outside the anchor rod, and pouring concrete into the steel sleeve after the steel sleeve is fixed. And the bearing platform is constructed and used for supporting the photovoltaic flexible support. According to the construction method, convenient and low-cost pile foundation construction of the boulder stratum can be achieved, and the pile foundation supporting performance is good.

The invention discloses a limited clearance lower corridor construction method and a construction device thereof. Belongs to the technical field of building construction. Aiming at the problems of low construction efficiency, unstable structural connection, poor integration effect and the like in corridor construction in a limited clearance environment, a solution is provided: a compact piling drill bit is adopted, and the compact piling drill bit is provided with a special structure, a quick-assembly and quick-disassembly interface and a high-strength alloy head; a sleeve with a high-precision thread, a sealing rubber ring and a reinforcing rib plate is used for concrete filled steel tube connection, and pressure grouting is matched; the integrated board is integrally prefabricated and positioned and installed through pressure grouting. According to the technology, the construction efficiency can be improved, the structural stability and waterproof performance are enhanced, the construction difficulty is reduced, and the technology is suitable for corridor construction in limited clearance scenes such as old urban areas.

The method comprises the following steps: S1, firstly, determining a water seepage position, and cleaning a wall surface around the water seepage position so as to determine a grouting and leaking stoppage range; s2, according to the grouting position of the outer wall, the thickness of the outer wall structure is determined, the depth of drilled grouting holes is determined, and the grouting holes are distributed; grouting water stop needle heads are embedded in the grouting holes; and S3, grouting equipment is used for pouring an elastic resin grouting material into the grouting holes in the step 2). The method is used for repairing the leakage of the outer wall surface, construction with water can be carried out, the construction period is short, and the non-seepage and non-leakage effect can be completely achieved; meanwhile, outer wall face leakage repairing can be conducted, external heat preservation components of the building do not need to be damaged, and the energy-saving heat preservation performance of the building subjected to leaking stoppage repairing is guaranteed; and compared with leakage repairing from the outside, measures such as a hanging basket are not needed, the cost is greatly reduced, and meanwhile the construction safety is greatly improved.

The invention relates to the technical field of foundation engineering, in particular to a sunken post-tensioning anti-floating anchor rod fabricated anchoring joint construction method which comprises the following steps: carrying out an anchor rod uplift bearing capacity test; constructing a cushion layer and manufacturing an anchor rod, wherein the anchor rod comprises a steel strand; an anchor rod construction point is positioned on the cushion layer; drilling and cleaning an anchor hole; lowering the anchor rod; performing primary normal-pressure grouting and secondary high-pressure grouting; maintaining the anchor rod; constructing a waterproof layer; binding reinforcing steel bars and installing a sealing anchor base; pouring structural bottom plate concrete; tensioning and locking the anchor rod; according to the construction method, it can be guaranteed that the site of the structural bottom plate is flat, operation of constructors and transportation of mechanical equipment are facilitated, the effect of protecting anchoring joints of the anchor rods is achieved, and the damage risk of the anchoring joints is reduced; compared with a traditional convex type or concave type anchoring node, the bottom plate can be reduced by a certain thickness, waterproof construction operation is simpler and more convenient, the labor material cost can be greatly reduced, the construction difficulty can be lowered, the self weight of the bottom plate is reduced, and the effect of shortening the construction period is achieved.

The invention provides a double-end circulating pressure grouting machine for foundation treatment, which comprises a storage box and a grouting body, a base is arranged at the bottom of the grouting body, a roller assembly and a stability augmentation assembly are arranged on the base, the roller assembly can move up and down along the height of the base and extend out of or retract into the base, and the stability augmentation assembly can move up and down along the height of the base. The stability augmentation assembly can horizontally move along the base and stretch out of or retract into the base, and when the rolling wheel assembly retracts into the base, the stability augmentation assembly can stretch out of the base to make contact with the ground. The pressure grouting machine has the beneficial effects that displacement caused by vibration is effectively reduced, the stability of the pressure grouting machine in the using process is improved, a rotating handle is limited by arranging a limiting rod, the stability of the pressure grouting machine is prevented from being influenced by rotation of the rotating handle, a stirring rod can move up and down while rotating by arranging a clamping rod and an inclined groove, and the stability of the pressure grouting machine is improved. And by arranging the second driving assembly, the sealing plate is automatically opened or closed, and automatic quantitative feeding is achieved.

The invention discloses a deep foundation pit anchor cable supporting device based on single-face formwork erecting and a construction method. The construction method comprises the following preparation steps that firstly, early-stage construction preparation and supporting cast-in-place pile construction are conducted, and site leveling, surveying and setting-out and construction equipment debugging are completed according to a deep foundation pit engineering design file; and the supporting cast-in-place pile is constructed at the preset position of the foundation pit design side boundary through the cast-in-situ bored The embedded steel bar construction core link is optimized, high-strength ribbed steel bars are selected to be matched with special epoxy embedded steel bar glue, through standard hole cleaning, pressure grouting and sufficient maintenance, it is ensured that embedded steel bars and supporting cast-in-place piles are tightly bonded and stably stressed, a waist beam and a soil retaining plate are integrally designed, the steel bars are integrally bound and formed, and formworks share a supporting system; the stress concentration at the connecting position is structurally avoided, tight lap joint of the upper-section soil retaining plate and the lower-section soil retaining plate is achieved through a tongue-and-groove structure, and the double-waterproof design of the water swelling strip and the polyurethane sealant is matched with the upper-section soil retaining plate and the lower-section soil retaining plate.

The invention belongs to the technical field of constructional engineering, and particularly relates to a rapid hole-forming construction process for a post-planted anti-floating anchor rod with a pressure grouting function, which comprises the links of intelligent positioning and geological adaptation preparation, self-adaptive hole-forming operation, anchor rod manufacturing and grouting, and temperature and humidity self-adaptive maintenance and acceptance. In the step of intelligent positioning and geological adaptation preparation, hole positions are positioned through three-dimensional laser scanning, conflicts are detected, a geological risk thermodynamic diagram is described by combining coring and radar scanning, and in the step of self-adaptive hole forming operation, torque and rotating speed are automatically adjusted according to the stratum, hole wall risks are monitored through sound waves, graded intermittent hole expanding is conducted, and cracks are blocked in a targeted mode. The method comprises the steps of anchor rod manufacturing and grouting, spiral rib anchor rod matching with a degradable support, double-cavity grouting pipe precise pressure control grouting, gradient grout supplementing after initial setting and temperature and humidity self-adaptive maintenance, temperature and humidity are monitored through a sensor, heat preservation and moisture preservation are automatically started, maintenance is finished after the standard is reached, and finally acceptance check is conducted to ensure that the anti-floating effect reaches the standard.

The present application belongs to the technical field of disposable plugging stopper, and specifically provides a combined pin plugging stopper and a slurry sealing and blocking method. The combined pin plugging stopper comprises a stopper pipe, a first pin, a sliding structure, a deformation piece, an inner support, a steel ball, a second pin, a connector, a slurry overflow port and a slurry outlet pipe. The stopper pipe is fixedly connected with a grouting pipe through the first pin. The other end of the stopper pipe is arranged along the central axis of the grouting pipe and is connected with the slurry outlet pipe. The steel ball is arranged inside the side of the stopper pipe close to the slurry outlet pipe. The second pin is arranged between the steel ball and the slurry outlet pipe. The sliding structure is sleeved on the stopper pipe and is provided with a plurality of deformation pieces. The end of the sliding structure close to the slurry outlet pipe is connected with the slurry overflow port arranged on the slurry outlet pipe through the connector. The inner support is arranged on the stopper pipe and between the adjacent two deformation pieces. The present application can solve the problem of sealing failure or difficult recovery in the high-pressure grouting process caused by the structural and technological defects of the existing plugging stopper.

By adding infiltration injection to the conventional high-pressure grouting method, it becomes possible to form large-diameter solidified bodies using suspended grout. Furthermore, it is possible to add injection material to excavated soil and reinject it, enabling ground improvement that is environmentally friendly and reduces CO2 emissions, while also providing a ground improvement method and injection device that can form larger solidified bodies that are lighter than conventional methods. [Solution] An injection device used in a high-pressure jet mixing method, comprising a guide pipe inserted into the ground, an injection inner pipe placed inside the guide pipe and used for injecting the injection material, and an opening / closing mechanism for opening or closing the space between the guide pipe and the injection inner pipe.

The invention provides a reinforcing material suitable for a carbon sequestration rock interface and a preparation method thereof, and the preparation method comprises the following steps: calcining magnesium oxide powder to obtain active magnesium oxide; uniformly mixing active magnesium oxide with monopotassium phosphate to obtain first mixed powder; the molar ratio of the active magnesium oxide to the monopotassium phosphate is (3-5): 1; adding borax accounting for 5-10% of the mass of the active magnesium oxide into the first mixed powder, and uniformly mixing to obtain second mixed powder; mixing the second mixed powder with mixing water according to a water-material mass ratio of 0.10-0.40, and stirring to obtain magnesium phosphate cement paste; within the initial setting time after the magnesium phosphate cement paste is prepared, the paste is injected into a mold through pressure grouting equipment, and curing carbonization is conducted after the paste and rock are formed. By the adoption of the technical scheme, the interface sealing life is greatly prolonged, and the anti-carbonization performance is remarkably improved.

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

The invention belongs to the technical field of constructional engineering grouting, and particularly relates to a negative pressure grouting system for crack plugging and a construction method.The negative pressure grouting system comprises a perforation grout blocking structure, a crack sealing structure and a negative pressure grouting structure, and the perforation grout blocking structure comprises perforation drilling grout blocking holes in the two ends of a crack to be treated; the crack sealing structure comprises a V-shaped groove or a U-shaped groove which is formed along the crack, a sealing layer is embedded in the V-shaped groove or the U-shaped groove, the sealing layer is flush with the surface of concrete, and the negative pressure grouting structure comprises a slurry inlet hole and a negative pressure hole which are formed in the two ends of a to-be-processed section of the crack respectively. The slurry inlet hole is connected with slurry inlet equipment through a first orifice valve, the negative pressure hole is connected with vacuum generation equipment through a second orifice valve, the first orifice valve, the second orifice valve, the slurry inlet equipment and the vacuum generation equipment are connected with a control system, and the control system performs unified operation according to a control logic system.

The invention discloses a step curtain multi-channel graded grouting surrounding rock reinforcement method. The method specifically comprises the following steps that S1, grouting pipes are manufactured; s2, drilling holes in the surrounding rock working face; s3, grouting pipes are inserted into the grouting holes to conduct grouting on the first set of grouting holes, other grout outlet holes are not grouted, and grouting is stopped when the surface of the surrounding rock leaks grout; s4, grouting is conducted on the second group of grouting holes, the third group of grouting holes... the n group of grouting holes in sequence, and a first grout stopping curtain is formed; and S5, cyclic re-grouting is conducted on the first group of grouting holes, then cyclic grouting is conducted on the second grouting holes of the second group, the third group,..., and the nth group, a second grout stopping curtain is formed, and cyclic reciprocating is conducted till the Nth grout stopping curtain is formed. The method has the advantages that shallow low-pressure grouting reinforcement without a grout stopping layer, pressurization of middle-deep surrounding rock and high-pressure grouting reinforcement are achieved, the grout leakage condition is prevented, grouting operation and parallel operation within the grout initial setting waiting time are achieved through circulating grouting of the multiple sets of grouting holes, and efficiency is improved.

The invention discloses a construction method for treating underground engineering leakage. The construction method comprises the following steps that 1, field investigation and leakage diagnosis are conducted; step 2, drilling and pressure relief; 3, a grouting pipe with adjustable and controllable pressure and flow is installed; step 4, preparing a cement-underwater non-dispersible mixed solution; step 5, pressure grouting; and step 8, post-processing and checking. According to the method, the treatment thought that active pressure relief is conducted firstly, and then directional grouting is conducted is adopted, after drilling pressure relief is conducted on an underground structure bottom plate or a structure side wall, accumulated water pressure is released, a low-pressure or non-pressure environment is created, special grout with underwater dispersion resistance and high fluidity is poured, plugging is conducted from the weakest position of the structure, and long-acting water stopping is achieved.