171 results about "Cement grout" patented technology

The invention discloses a composite reinforcement type suction barrel device based on microorganism induction and a use method thereof. The composite reinforcement type suction barrel device based on microorganism induction comprises a suction barrel model system, a microorganism cement reinforcement system and a test monitoring system. The suction cylinder model system comprises a suction cylinder, a grouting pipeline and hydraulic equipment, and the grouting pipeline is laid on the inner wall of the suction cylinder and used for injecting microorganism cement grout; the hydraulic equipment is connected to the suction barrel and used for controlling lifting and pressing-in of the suction barrel. The microbial cement reinforcement system comprises liquid storage equipment and negative pressure equipment, and the liquid storage equipment is connected to the grouting pipeline and used for storing and providing microbial cement grout for the grouting pipeline; the negative pressure equipment is connected to the suction barrel and used for applying negative pressure to the interior of the suction barrel in the grouting process, and permeation of microorganism cement grout is promoted. The test monitoring system is used for testing mechanical parameters of a soil body, monitoring the suction barrel and carrying out a loading test on the suction barrel.

The invention discloses an earth surface directional drilling high-pressure deep hole grouting construction method based on steel sleeve hole fixing. The earth surface directional drilling high-pressure deep hole grouting construction method comprises the following steps that firstly, a directional drilling machine is used for vertically drilling a grouting hole downwards; secondly, a plurality of steel floral tubes are sequentially put down in the three-opening first branch grouting hole; thirdly, cement-bentonite-based sleeve shell materials are continuously injected into the first section of the steel floral tube to the inner bottom of a first branch grouting hole of the three-opening hole, and an annular space between the first branch grouting hole of the three-opening hole and the steel floral tube string is filled with the cement-bentonite-based sleeve shell materials; fourthly, a packer is lowered to the bottom of the three-opening first branch grouting hole; a packing section is formed in front of the packer; and fifthly, cement grout is injected into the grouting pipe, grouting is conducted on the packing section, the finally-set cement-bentonite-based casing material is split and damaged under the effect of grouting pressure, and the grouting grout is injected into the stratum to be reinforced through the grout channel. According to the method, the hole collapse phenomenon when the grouting hole penetrates through the unfavorable geological section can be prevented, the grouting stopping effect of the packer is guaranteed, and retreating type segmented grouting construction is guaranteed.

The invention relates to the technical field of ecological restoration, in particular to a cylindrical permeation grouting range determining method and system considering the tortuosity of a porous medium, and the method comprises the following steps: collecting porous medium characteristic data and underground water pressure at a selected grouting point position; meanwhile, Bingham cement grout characteristic data are collected, and grouting parameters are set; the tortuosity of the porous medium is considered, and then the seepage velocity of Bingham cement grout is determined based on a rheological equation of Bingham fluid and a mechanical analysis equation of an infinitesimal body in the grouting pipe; and under the condition of the cylindrical diffusion boundary, a cylindrical permeation grouting range solving model is constructed based on the seepage velocity and the unit time grouting amount calculation formula, and the cylindrical permeation grouting spatial diffusion range quantitative index is solved according to the grouting parameters so as to determine the cylindrical permeation grouting range. The grouting quality and reliability in the ecological restoration project can be improved, the construction requirement under the complex ecological engineering environment is met, and effective restoration and sustainable development of an ecological system are achieved.

The invention relates to a foundation pit supporting method based on combination of steel sheet piles and tubular piles, which comprises the following steps of: firstly, excavating a foundation trench at the periphery of a foundation pit, vertically driving the steel sheet piles into the foundation trench to form a continuous supporting wall body, and realizing a closed joint through lock catch occlusion; the top of the prestressed concrete pipe pile is lower than the steel sheet pile; welding the pipe piles and the steel sheet piles by adopting H-shaped steel connecting pieces, wherein the welding length is greater than or equal to 1.5 times of the section height of the section steel; cement grout with the volume 1.8-2.2 times that of the pipe pile is injected within 24 hours after the pipe pile is installed; the section width of the locking beams is 1.2-1.5 times that of the flanges of the steel sheet piles, and the steel bars are in lap joint with the reserved steel bars of the steel sheet piles; and finally, a horizontal steel support comprising a pressure sensor and an electric jack is installed, and the axial force is dynamically adjusted through displacement monitoring. According to the method, the rigidity of a supporting system is remarkably improved through cooperative stress of the combined structure, the method is suitable for deep foundation pit engineering in the soft soil area, deformation can be effectively controlled, and automatic monitoring and adjusting are achieved.

The invention relates to a quick plugging device and method for an in-well water burst dewatering well. The device comprises a grouting pipe (1), a bag (2), a grouting device (3) and a one-way flowing piece (4). The grouting pipe (1) comprises a grouting outer pipe (11) and a grouting inner pipe (12), the grouting outer pipe (11) is connected with the bag (2), a one-way flowing part (4) is arranged at the joint of the grouting outer pipe (11) and the bag (2), the grouting inner pipe (12) is connected with the grouting device (3), the grouting pipe (1) extends into a well pipe of a dewatering well (5), and the position of the bag (2) is higher than that of the grouting device (3). Compared with the prior art, the rapid plugging device for the dewatering well is provided when water bursts in the well and under the flowing water condition, cement grout can be prevented from being washed away by water flow when water bursts in the well and under the flowing water condition, and the dewatering well is effectively plugged.

The utility model provides a sealing device for a pipe jacking receiving tunnel portal in a deep and weak silt layer. The sealing device comprises a steel ring, a sealing brush, a tunnel portal embedded steel ring and a grouting pipe. The device is characterized in that the multiple sealing brushes are arranged on one side of the inner surface of the steel ring in a circumferential arrangement mode; the sealing brushes are hinged; the hole pre-embedded steel ring is welded with one side of the outer surface of the steel ring; the hole pre-embedded steel ring is pre-embedded in a hole concrete structure; and the grouting pipe is annularly arranged on the hole pre-embedded steel ring. The sealing brush is installed in the steel ring, is in fine contact with the pipe piece and mainly prevents water, mud and the like from rushing into a receiving well along the periphery of the pipe piece, the pipe piece can be fixed in a threaded connection mode or a welded connection mode or other modes, installation can be fast, construction is easy and convenient, construction efficiency is high, and good feasibility is achieved; the safety, feasibility and construction efficiency in the pipe jacking starting process can be better improved, and the problems of water gushing, sand gushing and mud gushing are avoided.

The invention discloses a miniature steel pipe pile capable of achieving automatic monitoring and a construction technology, and relates to the technical field of miniature pile supporting, the miniature steel pipe pile comprises a steel pipe pile body, a pointed cone end is installed at one end of the steel pipe pile body, and a spiral blade is arranged on the outer side of the steel pipe pile body; the tip of the pointed cone is provided with a grout outlet hole and a casing material, and a grouting hole in the steel pipe pile main body is connected with a Laval nozzle; the steel pipe pile body is provided with a plurality of temperature sensors and displacement sensors, the temperature sensors are used for monitoring hydration heat release of cement grout in the grouting process, and the displacement sensors are used for monitoring deformation of the steel pipe pile body. Slurry hardening parameters and displacement deformation of the steel pipe pile can be monitored in real time, the grouting process is precisely controlled, and the service life of the steel pipe pile is prolonged.

The invention is a system and method for repairing, improving, and stabilizing subgrade and subsoil / natural ground layers of a rail bed generally consisting of softer soils. One embodiment includes a method of installing subsurface inclusions and ballast fills comprising injected slurry mixtures of stabilizing material such as cement grout mixed with in situ soil. Another embodiment includes a system of installed ground inclusions and ballast fills. Another embodiment includes an integrated system of equipment for emplacing the system of inclusions and ballast fills.

The invention discloses a tunnel lining efficient water plugging and reinforcing rapid-hardening mineral-based cementing material which comprises the following raw materials in parts by weight: 20-40 parts of sulphoaluminate cement, 20-40 parts of Portland cement, 5-10 parts of fly ash, 2-6 parts of wollastonite powder, 1-5 parts of quick lime, 0-5 parts of a retarder, 1-3 parts of aluminum oxide, 0.5-1.5 parts of potassium hydroxide, 1-2 parts of magnesium oxide and 0.5-1.5 parts of calcium sulfate. 2 to 3 parts of graphene oxide nanosheets; and 0.2 to 0.5 part of a water reducing agent. According to the quick-setting mineral-based cementing material, based on the alkali excitation activity, the crystallization principle of natural mineral formation and the chemical process principle of natural colloid formation, alkaline excitants such as graphene oxide and potassium hydroxide are adopted as additives, the fluidity of cement grout can be improved, the bleeding rate can be reduced, and the stone rate can be increased; the later strength is enhanced, the internal structure of the lining water plugging material is improved, and the impermeability is improved.

The utility model relates to the technical field of grouting pipelines, and discloses a backflow prevention device for a post-grouting pipeline, which comprises a pipe body, a grouting port is arranged at the upper end of the pipe body, a grout outlet is arranged at the lower end of the outer wall of the pipe body, a moving block is slidably connected to the lower end of the inner wall of the pipe body, and a circular groove is arranged at the bottom of the moving block. The top of the inner wall of the circular groove is fixedly connected with a spring, the lower end of the spring is fixedly connected with the bottom of the inner wall of the pipe body, and the top of the moving block is fixedly connected with a connecting block. According to the backflow preventing device for the post-grouting pipeline, when grouting is stopped, the moving block can move upwards under the action of the spring, the moving block drives the baffle to move upwards through the connecting block while moving upwards, and through the arrangement, the backflow preventing device has the advantages that after grouting of the grouting pipeline is stopped, the baffle can move to the position above a grout outlet under the action of the spring, and therefore the backflow preventing effect is achieved. Therefore, a good sealing effect on the grouting pipeline is achieved, the situation that cement grout flows back is effectively prevented, the backflow control efficiency is high, and the cost is low.

The utility model relates to the technical field of steel pipe pile construction, in particular to a grouting water stop device. The grouting water stopping device comprises a primary lock catch and a secondary lock catch which are connected with the steel pipe pile, the primary lock catch is provided with a water seepage monitoring sensor, a liquid inlet hole is formed in the end face of the secondary lock catch, a liquid flowing hole is formed in the side wall of the secondary lock catch, and the liquid inlet hole is communicated with the liquid flowing hole; and a grouting mechanism is arranged at the top of the sub lock catch and comprises a liquid inlet pipe and an insertion pipe, the liquid inlet pipe is arranged at the top of the insertion pipe and communicates with the insertion pipe, and the insertion pipe can be inserted into the liquid inlet hole. Through the cooperation of the insertion pipe and the liquid inlet hole and the connection of the insertion pipe and the liquid inlet pipe, cement slurry can enter the liquid inlet hole conveniently, and therefore the water stopping and plugging effects are achieved.

The invention discloses a bolting-grouting device and bolting-grouting equipment for pushing and grouting an anchor rod, and relates to the technical field of tunnel engineering machinery. The radial slurry discharge hole I is formed in the guide pipe, the radial slurry discharge hole II is formed in the nut loop bar, the butter slurry blocking assembly I is arranged on the nut loop bar at the tail end of the guide pipe, the butter slurry blocking assembly II is arranged on the anchor rod loop bar at the tail end of the nut loop bar, and when the butter slurry blocking assembly II fails, an axial slurry discharge hole is formed in the failure part; slurry in a gap between the nut sleeve rod and the anchor rod sleeve rod is discharged from the axial slurry discharge hole; an independent slurry discharging cavity is formed in the gear box, and the grease slurry blocking assembly II is located in the slurry discharging cavity. A quadruple slurry return prevention system of radial active slurry discharge, axial passive plugging, axial passive slurry discharge and gear box slurry discharge is adopted, and the problems that according to an existing bolting and grouting device, due to the fact that cement slurry flows back and infiltrates into a gear box, work of the gear box is affected, and gears are corroded and damaged are solved.

The invention discloses hydraulic engineering concrete conveying equipment based on hydroelectric power plant construction, and relates to the technical field of concrete transportation, the hydraulic engineering concrete conveying equipment comprises a body arranged in an inclined tubular shape, and the body is arranged in a coaxial double-barrel shape; the spiral conveying blade is coaxially and rotatably arranged in the body so as to convey the concrete from the low end to the high end; the anti-segregation units are arranged in the direction of the central axis of the body at equal intervals, and each anti-segregation unit comprises an elastic piece which is in an arc-shaped plate shape and is evenly distributed on the inner wall of the body in the circumferential direction. According to the invention, through the arrangement of the elastic piece and the grading gas circuit unit, a composite force field of axial propulsion and radial extrusion is formed through the spiral blade to forcibly mix and compact aggregate and cement paste again on concrete at a corresponding position, so that the influence on the quality of the concrete due to separation of the aggregate and cement is effectively avoided, and the transportation effect is improved.

The utility model discloses a test mold mounting platform matched with concrete core sample processing, which comprises an operating platform provided with a cutting machine, a clamping plate device is arranged on the operating platform, a plurality of test piece stations are arranged on the upper surface of the operating platform in the linear direction, test mold components are placed on the test piece stations, and the test mold components are arranged on the operating platform. The test mold assembly is clamped front and back by the clamping plate device before cutting; the test mold assembly comprises a cuboid test mold, a through hole is formed in the center of the test mold, a core sample is placed in the through hole, and a connecting layer filled with cement paste is arranged between the outer wall of the core sample and the inner wall of the test mold; the cutting perpendicularity and flatness are ensured; and meanwhile, the demoulding device and the cement grouting device are integrated on the operation platform, so that the operation is convenient, and the working efficiency can be greatly improved.

The utility model discloses an underground diaphragm wall anchor rod reserved casing pipe structure which comprises a reserved casing pipe, the reserved casing pipe is fixedly arranged in an underground diaphragm wall reinforcement cage, a water stop ring is fixedly arranged on the outer side of the reserved casing pipe, an anchor rod body is movably arranged in the reserved casing pipe, and a sealing plate is welded to the outer side of the bottom end of the reserved casing pipe. A limiting plug is welded to the top end of the reserved sleeve, a through hole is formed in the limiting plug, an anchor rod body is movably arranged in the through hole, an upper grouting pipe is welded to the side, facing upwards, of the reserved sleeve, a lower grouting pipe is welded to the side, facing downwards, of the reserved sleeve, and the upper grouting pipe and the lower grouting pipe both communicate with the interior of the reserved sleeve. The upper grouting pipe and the lower grouting pipe are both arranged to be in an L shape. By arranging the upper grouting pipe and the lower grouting pipe, after anchor rod construction is completed, the reserved sleeve can be fully filled with cement paste, then the anchor rod can be placed in a closed space, and water is effectively prevented from invading a gap between the anchor rod and a hole wall.

A construction method for enhancing the joint waterstop effect of an underground diaphragm wall comprises the steps that after an underground diaphragm wall formwork is placed in a foundation pit, an underground diaphragm wall framework unit at the starting end, a plurality of underground diaphragm wall framework units at the middle sections and an underground diaphragm wall framework unit at the terminating end are sequentially placed in the formwork, and each underground diaphragm wall framework unit comprises a reinforcement cage and H-shaped steel at the end; a limiting inclined plate is arranged at the included angle position of the outer side face of the H-shaped steel, after the outer side face of the H-shaped steel in the previous underground diaphragm wall framework unit is cleaned, the next underground diaphragm wall framework unit continues to be placed, and after placing is completed, a grouting pipe and a water stop steel plate are vertically inserted into the included angle position in the limiting inclined plate; concrete grout is injected into the position of the reinforcement cage to form the underground diaphragm wall, before the underground diaphragm wall is condensed and hardened, cement grout is injected into the grouting pipe, the grout at the position of the replacement included angle is squeezed out, and the cleaning quality of the grout is improved.

The invention discloses an intelligent online cement paste fluidity detector, which comprises a clamp clamped on the cylinder wall of a cement mixer, the sliding table is arranged above the clamp and comprises a shell, a limiting column, a first lead screw and a moving block; the rack is fixedly connected with the moving block and moves along with the moving block; the extraction pump penetrates through the rack; the funnel is arranged at the front end of the rack, and a weight sensor is arranged between the funnel and the rack; the leveling mechanism is arranged on the side wall of the rack; the liquid level sensor is arranged at the top of the funnel; the switching mechanism is arranged at the bottom of the funnel and comprises a push rod and a connecting rod; and the PLC is used for controlling the extraction pump, the weight sensor, the liquid level sensor and the switching mechanism. The fluidity detector does not need a special preparation site, so that the test site is saved; under the combined action of the liquid level sensor, the weight sensor, the extraction pump and the PLC, the cement grout is automatically extracted, and the volume, the mass and the liquid level height of the extracted grout are accurate and meet test requirements.

This invention discloses a device and method for reinforcing the top of vibratory compaction stone piles in soft soil. The device includes a positioning device and a grouting pipe. The positioning device consists of two assembleable rings. The inner ring has a hole diameter larger than the vibratory compactor diameter but smaller than the pile diameter, serving as a channel for the vibratory compactor to fall. The outer ring has a diameter larger than the intended pile diameter and can be stably positioned around the pile hole on the ground. Grouting pipe installation holes are symmetrically arranged around the inner ring for installing the grouting pipe. This device can be used in conjunction with conventional construction equipment such as vibratory compactors. After the hole is formed, the positioning device is set on the ground to fix the position and depth of the grouting pipe. Grouting begins after the crushed stone is filled, with the pipe being pulled out while grouting, ensuring that the cement grout is evenly mixed with the crushed stone at the shallow part of the pile top, thus reinforcing the shallow part of the crushed stone pile that is prone to bulging and damage. This reinforcement method can greatly improve the overall strength of the vibratory compaction stone pile, while saving construction costs. The grouting pipe depth can be adjusted according to the project conditions, offering high flexibility.

The invention relates to the technical field of image recognition and engineering grouting, in particular to a slurry fluidity image recognition method and device suitable for non-vertical shooting. The identification method comprises the following steps: step A1, establishing a cement paste fluidity testing device; a2, adjusting the glass plate to be in a horizontal state; and step A3, obtaining the cement grout surface area. The device is used for completing the identification method. According to the invention, the problem of area pickup error caused by image recognition of an image with a shooting inclination angle in the prior art can be solved.

The invention belongs to the technical field of grouting devices, and particularly relates to a grouting device for tunnel engineering, which comprises a high-pressure air pipe, a grouting pipe fitting is movably mounted in the high-pressure air pipe, a high-pressure rubber pipe is movably mounted at one end of the grouting pipe fitting, and the high-pressure rubber pipe is used for conveying grout. The grouting pipe fitting comprises a grouting guide pipe movably installed in the high-pressure air pipe and a connecting piece installed above the grouting guide pipe in a threaded mode, airflow of the air supply equipment can be blown out from a hole formed in the high-pressure air pipe and one end facing the interior of a drill hole, broken stones and rock powder are blown away, insertion of the high-pressure air pipe is not affected, and the grouting efficiency is improved. The grouting guide pipe is taken and inserted into the high-pressure air pipe until the corresponding grouting hole is aligned with the hole formed in the high-pressure air pipe, cement grout is conveyed into the grouting guide pipe, and continuous input of the cement grout enables the cement grout to pass through the grouting hole and the hole formed in the high-pressure air pipe to be output into rock gaps and gaps outside the drilled hole; and filling is carried out.

This invention discloses a pipe roof support structure for reducing surrounding soil displacement, comprising a pipe, rails, and a worm gear. Two or more rails are arranged on the inner wall of the pipe, and each rail is equipped with two or more power switching mechanisms. The first end of the worm gear is fixedly connected to a support plate via a bearing seat, and the second end of the worm gear is fixedly connected to a base via a bearing seat. A fixed support plate is fixedly connected to the middle of the worm gear near the first end via a bearing. An impeller is coaxially fixedly connected between the worm gear and the fixed support plate. The base is slidably connected to the rails, and the support plate and fixed support plate are slidably connected to the rails. This invention provides power through the rotation of the impeller. The cooperation of the power switching mechanism and the guiding and reinforcing mechanism allows cement grout to flow into the soil around the pipe with a relatively small grouting pressure, making the soil around the pipe more stable.

The invention provides a tunnel engineering reinforced pipe shed pipe and a construction method, and belongs to the technical field of tunnel construction, a pipe tip is arranged at one end of the head of a pipe tip section, a first longitudinal rib plate is arranged on the outer wall of the pipe tip section, a standard section is assembled and connected to the tail of the pipe tip section through a connecting pipe, and a second longitudinal rib plate is arranged on the outer wall of the standard section; the adjacent standard sections are assembled and connected through connecting pipes; the tail part of the standard section at the tail end is assembled and connected with a pipe top section through a connecting pipe, a third longitudinal rib plate is arranged on the outer wall of the pipe top section, and the tail part of the pipe top section is assembled and connected with a propelling grouting section through a connecting pipe. Through the steel pipe and longitudinal rib plate combined structure, the flexural rigidity and structural stability of a pipe shed supporting system are effectively improved, and therefore the problem that the strength and rigidity of an original independent steel pipe cement grout or steel pipe and reinforcement cage concrete combination are insufficient is thoroughly solved.

The invention relates to the technical field of underground railway tunnel construction, and discloses an underground railway tunnel excavation section end reinforcement construction method which comprises the following steps of reinforcement scheme selection, reinforcement range determination, high-pressure jet grouting pile construction, precipitation well arrangement, grooving quality control and construction pretreatment. A double-pipe high-pressure jet grouting pile is adopted to form a secant pile body, and layered pressure control is implemented; the manufacturing process of the guide wall sequentially comprises the steps of surveying and setting out, exploring trench excavation, guide wall trench excavation, trench bottom tamping, steel bar binding, formwork installation and concrete pouring. Differentiated reinforcing combinations are adopted for different geological conditions, a three-dimensional waterproof curtain is formed through a stepped built-in structure, and the method adapts to the permeability difference of complex stratums; the high-pressure jet grouting pile is precisely controlled, layered pressure control is combined with graphene modified cement grout, and the pile body meshing compactness is ensured; and therefore, the effects of efficient reinforcement and water stop of the shield end under the complex geological condition are achieved.

The invention provides a control method and system for a cement grout underground injection process. The method comprises the following steps: acquiring historical diffusion distance data; extracting a grouting border-crossing record during grouting of the cement grout from the historical diffusion distance data, and determining a border-crossing fluctuation index of the cement grout during grouting according to the grouting border-crossing record; historical grouting flow data are obtained, the flow safety interval of each cement grout control node is further determined, and the flow adjusting weight of each cement grout control node in the border crossing state is determined according to each flow safety interval and the border crossing fluctuation index; the diffusion deviation record of the ground grouting station is further extracted, then the maximum allowable deviation of the ground grouting station during cement grout grouting is determined, and the grouting adjusting amount of the diffusion distance is determined through all the flow adjusting weights and the maximum allowable deviation; the diffusion distance of each cement grout control node in the ground grouting station is restrained and adjusted based on the grouting adjusting amount; and adaptive adjustment of the diffusion distance is realized.

The invention relates to the technical field of offshore oil engineering, in particular to an anti-scour cement grouting device for governing suspended span of submarine pipelines, which is used for solving the problem that an existing device cannot have the functions of fixing and stabilizing and secondary suspended span governing at the same time. The first grouting bag is fixed to the seabed and located on the lower portion of the suspended span position of the pipeline, and a fixing mechanism is fixedly arranged on the upper portion of the first grouting bag. When grouting is conducted in the first grouting bag, the size of the first grouting bag is increased so that the gap between the pipeline and the seabed can be filled, and after the pipeline is supported by the first grouting bag, the pipeline is fixed to the fixing mechanism so that the pipeline can be fixed to the first grouting bag; the device makes full use of the characteristics of high structural supporting strength, adjustable suspended span treatment height, prevention of secondary suspended span of the pipeline, stabilization and fixation of the pipeline, simple operation, high pertinence and the like of an anti-scouring grouting device, the suspended span problem in the production process of the submarine pipeline is well solved, and safe operation of the submarine pipeline in the service period is realized.

The application provides a fabricated nuclear magnetic resonance shielding room structure and a construction method, relates to the technical field of fabricated buildings, and is composed of multiple fabricated floors, wallboards and roof plates, multiple floors or roof plates are assembled to form a protruding outer rim fence, assembling holes are formed in the outer rim fence, upper and lower outer rim surfaces of multiple wallboards are inserted and matched with the assembling holes of the floor or roof plate through fixed inserting columns, the columnar stirrups of adjacent wallboards are arranged in an up-down staggered mode, the columnar stirrups arranged in the up-down staggered mode are fixed by steel wire ropes, lead casting holes are formed in the T-shaped shielding clamps, the cement grouting connection mode commonly used in traditional fabricated buildings is adopted, the structure is ensured to be firm, the grouting position is optimized, the disadvantages that the traditional fabricated buildings cannot realize seamless electromagnetic shielding due to segmented assembly are solved, and the industry problem is solved.

This invention belongs to the field of underground engineering technology and discloses a caisson bottom sealing device and method. The caisson bottom sealing device includes a sealing membrane assembly and a grouting channel. The sealing membrane assembly has a sunken state and a casting state. When in the sunken state, the sealing membrane assembly surrounds and covers the inner wall of the caisson. The sealing membrane assembly can be folded into the casting state. When in the casting state, a portion of the sealing membrane assembly surrounds and covers the cutting edge sidewall, while another portion adheres to the excavation face, forming a closed casting surface on the excavation face. The grouting channel is located on the cutting edge sidewall and is used to deliver cement grout between the sealing membrane assembly and the cutting edge sidewall. Using the above-mentioned caisson bottom sealing device, this method can isolate the bottom sealing concrete from the soil layer of the excavation face, avoiding the formation of local weak points during the pouring of the bottom sealing concrete. Furthermore, by injecting cement grout, the waterproofing performance at the cutting edge position is greatly improved.

The utility model relates to the field of grouting equipment, in particular to a cement grouting machine which comprises a rack, a grouting pump, a grout inlet pipe and a grout outlet pipe are arranged on the rack, the grout inlet pipe and the grout outlet pipe are detachably connected to the grouting pump, a control valve is arranged on the grout outlet pipe, and moving wheels are further arranged at the bottom of the rack; the positioning assembly is arranged on the rack, the positioning assembly comprises a buffering part and a lifting part, and the buffering part is used for absorbing vibration generated by the grouting pump; the lifting component is used for driving the buffering component to move up and down; and the storage assembly is arranged between the rack and the soybean milk outlet pipe and used for storing the soybean milk outlet pipe. The cement grouting machine has the effect of improving the use convenience and construction efficiency of the cement grouting machine.

A method for treating goaf by constructing artificial key layer using waste rock granular grouting, comprising the following steps: carrying out geological and measurement investigation; drilling rock sample and carrying out physical and mechanical property test to determine physical and mechanical property parameters of rock sample; investigating blockiness of waste rock granular in goaf, finding out waste rock blockiness distribution rule and porosity in goaf; selecting waste rock granular sample in goaf, carrying out similar material simulation experiment, establishing physical model of artificial key layer, researching seepage rule of waste rock cementation filling, testing mechanical property of cementation filling body; carrying out finite element analysis on artificial key layer; analyzing mechanical characteristics and bearing mechanism of waste rock grouting cementation filling body and surrounding rock coupling body; constructing artificial key layer on site; carrying out waste rock granular cement grouting filling on goaf above artificial key layer; treating goaf below artificial key layer, carrying out residual ore recovery after treatment; carrying out waste rock granular cement grouting filling on goaf below artificial key layer.

The invention relates to a CO2 anti-escape construction method for a water-based foam carbon sequestration cement soil mixing pile, which comprises the following steps of: connecting a CO2 foaming machine to a slurry conveying pipe of a mixing pile machine through a three-way pipe, after a drill rod of the pile machine cuts a soil body to a preset soil layer depth, injecting slurry into the drill rod through the slurry conveying pipe, and simultaneously injecting CO2 water-based foam into the slurry conveying pipe through the CO2 foaming machine to be mixed with cement slurry, the drill rod is lifted while guniting towards the surrounding soil body to form a water-based foam cement soil pile; and when the water-based foam cement soil pile is constructed to a certain height away from the ground surface, the water-based foam filling valve is closed, the drill rod continues to be lifted, a section of high-mixing-amount cement soil pile is formed on the top of the water-based foam cement soil pile, and finally a lime soil mattress layer with a certain thickness is constructed on the top of the cement soil pile. The carbon sequestration effect of the cement soil pile can be improved, and CO2 in cement soil is prevented from escaping from the earth surface.