136 results about "Cement grout" patented technology

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 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 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 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 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.

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.

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.

The utility model belongs to the technical field of building components, and particularly relates to a convenient-to-disassemble temporary consolidation structure for a continuous beam of a bridge. Comprising grouting sleeves, thick steel bars, temporary consolidation stand columns and cement grouting materials. The grouting sleeve is pre-buried in a main beam of a bridge, and a sleeve opening is downwards exposed out of the bottom of the main beam; the temporary consolidation stand column is tightly attached to the lower portion of the main beam. The lower ends of the thick steel bars are arranged in the temporary consolidation stand columns, and the upper ends of the thick steel bars are inserted into the grouting sleeves. Thick steel bars are arranged in the temporary consolidation column, so that the temporary consolidation column is tightly attached to the main beam, and the temporary consolidation column can bear certain horizontal force. And after the temporary consolidation function is completed, the thick steel bars in the temporary consolidation column are withdrawn, and then cement grouting materials are poured into the grouting sleeves, so that the purpose of sealing the embedded holes in the main beam is achieved, and the overall section is formed. The structure is convenient to assemble and disassemble and low in difficulty, reduces the risk caused by cutting or ignition of the main beam in a conventional structure, and improves the durability of a main body structure.

This application relates to the field of dam foundation seepage prevention and reinforcement construction technology, and in particular to a construction process for an ultra-deep dam foundation overburden seepage barrier wall. The process includes using a rotary drilling rig to drill along the axis of the seepage barrier wall, sequentially lowering multiple spliced ​​casings in sections, clearing the soil inside the casings, pouring concrete to form in-situ concrete piles, and before the concrete has initially set, connecting the grouting equipment and air source to the cement grout nozzle and air nozzle respectively, adjusting the casings so that the cluster injection assembly faces the adjacent pre-set piles, lifting and removing the casings in sections, and using the cluster injection assembly to directionally inject grout to form the seepage barrier wall. This application achieves the technical effect of forming a tightly overlapping seepage barrier wall in the ultra-deep dam foundation overburden layer, effectively solving the seepage problem, and being able to cope with obstacles in the strata, ensuring construction quality and effectiveness.

The invention relates to a combined drill bit for a cement-soil mixing pile, which comprises a plurality of central drill rods which are vertically arranged in parallel at intervals, and a plurality of drill rod blades are fixedly arranged at the lower section of each central drill rod at intervals; the plurality of outer sleeve drill rods are coaxially and rotationally sleeved on the upper section of the central drill rod respectively; the lower section of the central drill rod is coaxially and rotationally sleeved with the stirring assemblies, the stirring assemblies are fixedly installed at the bottom end of the outer sleeve drill rod, a plurality of stirring outer blades are fixedly installed on the outer side faces of the stirring assemblies at intervals, a plurality of stirring inner blades are fixedly installed on the inner side faces of the stirring assemblies at intervals, and the stirring inner blades and the drill rod blades are arranged in a staggered mode; and the stirring outer blades of the adjacent stirring assemblies are arranged in a staggered manner. The outer stirring blades and the inner stirring blades of the combined drill bit are responsible for cutting and stirring soil in a pile body and surrounding soil, it is guaranteed that most of the area of a stirring pile is forcibly stirred, the stirring range completely covers the range of the stirring pile, cement grout and the soil body are fully mixed, and the stirring effect is good.

This invention discloses an installation assembly for a fiber optic microseismic sensor for roof surrounding rock, relating to the field of microseismic monitoring technology in coal mines. Addressing the problems of poor coupling effect, easy loosening and detachment, signal attenuation, and low monitoring accuracy of existing fiber optic microseismic sensors, this invention includes a fiber optic microseismic sensor, a locking mechanism, and a grout injector. The sensor is initially fixed to the borehole top wall of the roof surrounding rock with an anchoring agent. The locking mechanism clamps the lower part of the sensor through a fixed sleeve with protrusions. The grout injector is located below the locking mechanism; its internal flow channel can inject cement grout into the upper borehole space, filling all gaps between the sensor, the fixed sleeve, and the borehole wall, achieving tight and effective coupling between the sensor and the surrounding rock. This invention can significantly improve the microseismic signal transmission efficiency and monitoring accuracy, prevent the sensor from loosening and detaching due to surrounding rock deformation and mining activities, meet the needs of long-term stable monitoring underground, and ensure the safety of coal mining.

The invention discloses a floor thickness control device and process integrated with a protective layer cushion block, and aims to solve the problems that a traditional steel bar protective layer cushion block is easy to displace, and the floor thickness needs to be additionally controlled. The device consists of a cake-shaped cushion block, a U-shaped metal bracket and a hard plastic sleeve, wherein the cake-shaped cushion block is integrally cast with the U-shaped metal bracket by adopting cement mortar or fine aggregate concrete; the U-shaped metal support comprises a thin steel plate strip and two vertical steel bar end rods welded to the two ends, when the device is installed, the thin steel plate strip is tightly attached to the bottom face of a floor lower layer stressed steel bar, and the vertical end rods are limited to avoid displacement of the cushion block. After a floor reinforcement cage is bound, the vertical end rod is tightly sleeved with a hard plastic sleeve, and the sum of the height of the sleeve and the thickness of the cushion block is equal to the designed thickness of a floor; when concrete is poured and plastered, accurate control over the thickness of the floor slab is achieved through the height of the top face of the sleeve, open holes are formed in the side wall of the sleeve in a staggered mode, an inner cavity is filled with cement paste, and floor slab holes are prevented. Double precise control over the floor slab protection layer and the thickness is synchronously achieved through the integrated composite component, the working procedure is simplified, the efficiency is improved, and the cast-in-place floor slab construction technology is efficiently improved.

This invention relates to the field of cement mixing pile construction technology, specifically to a mechanized integrated design for cement mixing piles in silty soft soil. The design includes a mobile box with a control console fixedly connected to its top. A mixing mechanism is mounted on top of the control console. This mixing mechanism comprises a robotic arm, a fixed frame, and a protective cover. Positioning is achieved through the mixing mechanism, a mast, and the robotic arm. After positioning, the robotic arm's telescopic rod pushes the fixed frame downwards, inserting the protective cover into the ground. Once inserted, a motor rotates, driving the mixing blades to rotate and mix the cement. During the sinking and mixing process, the soil stress gradient can be monitored in real time. By dynamically adjusting the grout injection pressure and flow rate, insufficient grout injection pressure and range are avoided, thus ensuring the construction quality of the cement mixing pile. To ensure the permeability of the cement grout, the injection pressure and drill bit speed work synergistically during the sinking and mixing process, with high-pressure injection combined with low-speed mixing.

This utility model discloses a novel support structure for cement-soil mixing pile walls. A guide trench extends longitudinally along the direction of the wall to be constructed. A lower bearing body is transversely spanned across the guide trench, with both ends supported by the top surfaces of the trench walls on either side. An upper bearing body is positioned above the lower bearing body, its bottom surface supported by the top surface of the lower bearing body. A vertically penetrating upper central hole is located in the center of the upper bearing body, with the upper and lower central holes arranged vertically opposite each other. An H-shaped pile is inserted downwards into the bottom cement grout from the bottom of the guide trench, with its middle section passing through both the upper and lower central holes. A fixing connector is fixedly connected between the H-shaped pile and the upper bearing body to maintain the vertical position of the H-shaped pile. This design allows for precise positioning, orientation, and depth of the inserted H-shaped steel during the cement grout solidification process, reduces the size of tooling and equipment, decreases installation and dismantling workload and floor space requirements, and improves construction efficiency.

The invention discloses a small electric cement grouter and a grouting method. The small electric cement grouter comprises a small electric cement grouter structural body and a cement outlet grouting pipe arranged on the left side of the small electric cement grouter structural body. A rubber air bag ring is arranged on the inner side of the side face outer connecting sleeve, a side face connecting box is arranged on the right side of the side face outer connecting sleeve, a shifting connecting adjusting knob is arranged in the side face connecting box, and the built-in telescopic connecting body communicates with the rubber air bag ring. The built-in telescopic connecting body is extruded and compressed by a middle connecting movable threaded rod under the action of threads by rotating a shifting connecting adjusting knob, the external connecting pipe can be extruded and limited after the built-in telescopic connecting body is expanded, the extruded position of the built-in telescopic connecting body can be sunken in an embedded groove, sliding of the built-in telescopic connecting body can be avoided, and meanwhile operation is easy and fast, convenient to achieve and high in practicability. Therefore, the efficiency of mounting and dismounting the external connecting hose by a worker can be effectively improved, and the use practicability of the small-sized electric cement grouter is effectively improved.

This invention provides a method for microbial soil nailing slope reinforcement based on microbial-induced calcium carbonate precipitation, belonging to the field of geotechnical engineering technology. The invention involves drilling holes in the slope surface and filling these holes with calcareous sand. A slurry containing urease-producing bacteria is injected into the calcareous sand-filled holes, and the mixture is allowed to stand. Then, a cementing liquid is injected to induce microbial calcium carbonate precipitation, resulting in a microbial soil nailed slope reinforcement. This invention creatively combines MICP technology with soil nail structure, using MICP technology to replace traditional cement grouting. This generates calcium carbonate crystals that cement the calcareous sand and surrounding soil, reducing the swelling and shrinkage of expansive soil under rainwater conditions. It inhibits slope surface collapse under alternating wet and dry conditions and reduces the possibility of shallow landslides during these processes. Simultaneously, it improves the shear strength and pull-out resistance of the nail-soil interface, reducing environmental pollution.