72 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 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 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.

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 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.

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 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.

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.

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.

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.

The utility model relates to the technical field of pile foundation engineering, and particularly discloses a physical model test device for testing the anti-pulling performance of a non-soil-squeezing precast pile foundation, which comprises a multifunctional cement grouting machine, a slurry storage pool, a vacuum pump, a water storage tank, a vacuum water pumping pipe, a model box bottom plate, a model box side plate and a high-strength toughened glass plate, and the output end of the multifunctional cement grouting machine is communicated with the outer surface of the slurry storage tank. According to the large-diameter non-soil-squeezing uplift pile construction device, an axial load is applied through an axial jack, loads of the upper portion and the lower portion of a model pile are collected through an upper pressure sensor and a lower tension sensor, pile body strain is collected through a pile body strain gauge, and a load displacement curve (Q-S curve) of a static load test of an uplift pile is obtained; the bearing capacity and the side friction resistance of the while-drilling pipe pile are obtained through calculation, the displacement of the uplift pile and the displacement of the soil layer can be obtained through the dial indicator and the laser displacement meter respectively, and therefore the contribution effects of different uplift measures on the uplift force are judged.

This invention discloses an inflatable model for a goaf roadway and a roadway construction method. The inflatable model includes: an airbag with an arched roadway shape; grouting pipes, including a main pipe and several branch pipes, with the main pipe positioned along the circumference of the arch of the airbag; several branch pipes arranged sequentially along the axial direction of the main pipe, located at the arch top of the airbag, and detachably connected to the main pipe; the branch pipes are rigid pipes, with several staggered grouting holes on their sidewalls, and plugged with plug rods; several groups of grouting pipes are arranged sequentially along the axial direction of the airbag. The roadway construction method includes the following steps: placing the inflatable model in the goaf and inflating it; pouring mortar to cover the inflatable model; injecting cement grout into the grouting pipes to push open the plug rods, with the cement grout flowing through the grouting holes into the mortar voids; and removing the airbag. This invention has the advantages of rapid construction and stable roadway formation.

The utility model discloses a main cavern top arch layer advanced manhole grouting construction device, which relates to the technical field of cavern construction, and comprises an anchor rod main body which is arranged in a manhole and is provided with a grouting cavity, a fixed block and a connecting ring which are arranged in the anchor rod main body in a sliding manner, an anchor rod drill bit is fixedly arranged at the head part of the anchor rod main body, and an external thread is arranged on the outer side of the tail end of the anchor rod main body; a grout outlet is formed in the outer side of the anchor rod body, an opening is formed in the side face of the anchor rod body, extending blocks are fixedly arranged on the two sides of the fixing block, an inner cavity is formed in the fixing block, through holes connected with the outside are formed in the two sides of the inner cavity, and a sliding baffle is arranged in the inner cavity. After grouting is conducted in a manhole through the anchor rod body, the fixing bolt is rotated to drive the connecting ring to move towards the inner side of the manhole, so that the extending block drives the fixing block to move inwards in the anchor rod body to compress cement paste in the manhole, the pressure of the cement paste reacts on the baffle at the moment, the baffle abuts against the through hole, and the cement paste is prevented from falling down.

The utility model relates to the technical field of prefabricated stairs, and discloses an assembly type building prefabricated stair which comprises a stair platform and a prefabricated bottom plate connected to the stair platform, a movable sliding groove is formed in the top face of the prefabricated bottom plate, the movable sliding groove is fixedly embedded in the prefabricated bottom plate, and the prefabricated bottom plate is connected with the stair platform. Clamping grooves are evenly formed in the side wall in the movable sliding groove at equal intervals. The fixing block at the bottom of the prefabricated step is aligned with the movable sliding groove and clamped into the movable sliding groove, the clamping block on the fixing block is clamped with the clamping groove in the movable sliding groove, the prefabricated step can be rapidly installed on the prefabricated bottom plate, and then cement paste is injected into the movable sliding groove through the pouring groove in the connecting pipe. When the step and the bottom plate are assembled, the movable sliding groove and the fixed groove are filled with cement paste, and the step and the bottom plate are firmly fixed together after the cement paste is solidified, so that the step and the bottom plate can be fixed together without installing a large number of screws by using professional tools during assembly, and the construction process is more convenient.

The utility model discloses a full-prefabricated assembly type double-column high pier device which comprises a cover beam (13), a bearing platform (6), a pier column upper section (11), a pier column lower section (1) and a pier column middle section (10) with a tie beam, socket holes (14) are formed in the bottom face of the cover beam (13) and the top face of the bearing platform (6), and pier column socket sections (9) embedded in the socket holes (14) are arranged on the upper portion of the pier column upper section (11) and the lower portion of the pier column lower section (1) respectively. Gaps (3) between the pier column socket sections (9) and the socket holes (14) are filled with high-strength shrinkage-free cement grouting materials (4), and corrugated steel pipes (5) are adopted on the inner walls of the socket holes (14) of the cover beam (13) and the bearing platform (6) to serve as permanent templates. The component is low in transporting and hoisting difficulty, the mechanical property of a connecting joint is reliable, the construction precision requirement is low, and good economic benefits are achieved.

This utility model relates to the field of pipeline maintenance technology and discloses a patch repair structure for trenchless pipeline local repair. It includes a pipe body and an elastic airbag fixed to the outside of the pipe body. A connecting pipe is provided inside the elastic airbag, and an internal thread is provided at the lower part of the connecting pipe. An end cap is provided at the end of the connecting pipe, and a second external thread is provided on the surface of the end cap to cooperate with the internal thread. This utility model involves placing this structure at the damaged area of ​​the pipeline, opening the end cap, and inflating the elastic airbag through the connecting pipe to make the airbag bulge and fit tightly against the inner wall of the pipeline, thus fixing the structure. Then, by opening the threaded cap and using a connecting cylinder, cement grout is injected into the gap between the pipe body and the inner wall of the pipeline, thereby completing the local repair of the pipeline. This method is lower in cost and suitable for use in pipelines with small-scale damage.

This invention discloses a cement grout injection barrier wall construction device, belonging to the field of barrier wall construction technology. The invention includes a discharge pipe, a lower conveying pipe, and an upper conveying pipe connected sequentially from bottom to top. A spiral guiding mechanism is fixed to the inner wall of the lower conveying pipe, and an impeller drive mechanism is connected below the spiral guiding mechanism. The spiral guiding mechanism includes a spiral guide plate; the impeller drive mechanism includes a rotating impeller, with the bottom discharge end of the spiral guide plate obliquely facing the rotating impeller; the rotating impeller is externally connected to a concrete vibrator mechanism via a transmission pair. In specific applications, cement grout is injected through the upper conveying pipe. Through the spiral guiding action of the spiral guide plate, the grout is directed and discharged from the discharge end of the spiral guide plate, generating an oblique impact force on the rotating impeller, thereby driving the impeller to rotate. The transmission mechanism drives the vibration unit inside the concrete vibrator mechanism to rotate, generating vibration and discharging air bubbles from the cement grout or polymer grout during the grouting process.

The invention provides a composite pile barrel type foundation and a wind turbine generator tower barrel, and relates to the technical field of wind power generation foundation engineering, the composite pile barrel type foundation comprises a drilling prefabricated composite pile and a bearing platform, the drilling prefabricated composite pile is composed of a plurality of drilling holes with the centers arranged in a closed ring shape, and cement grouting bodies are poured into the drilling holes; the adjacent grouting bodies are meshed with each other in the soil body between the holes to form an annular continuous cylindrical structure; the prefabricated pipe pile is inserted into the center of the cement grouting body in each drill hole, and an anti-sliding groove is formed in the outer surface of the prefabricated pipe pile. According to the embodiment of the invention, the technical problems of insufficient bearing capacity, poor stability and low construction efficiency of a traditional fan foundation are solved, and the technical effects of high bearing capacity, high adaptability, improvement of construction efficiency and excellent economical efficiency are achieved.

The invention relates to the technical field of continuous wall construction monitoring, in particular to a TRD construction method wall depth, deflection and cement grout injection amount integrated monitoring method and system. Arranging a multi-source sensor and a design strategy; 3, collecting multi-source data in real time; 4, performing data fusion and intelligent analysis; 5, dynamic regulation and control and closed-loop control are carried out; step 6, performing visual feedback and early warning; real-time monitoring is carried out, multi-source data fusion and intelligent analysis are carried out based on the digital twin model, the limitation of scattered monitoring elements is broken through, multi-parameter cooperative linkage is achieved, the dynamic regulation and control module can automatically adjust the tunneling speed, the deviation rectifying device and grouting parameters according to the analysis result, closed-loop control is formed, and the construction efficiency is improved. Wall nonuniformity, depth deviation or grout distribution defects caused by mutual influence of parameters are effectively avoided, and therefore the overall quality, strength consistency and water stop reliability of the wall are remarkably improved.

The application discloses a mine-used high-strength rapid-setting cement grouting material and a preparation method thereof, and belongs to the technical field of mine repair materials. The technical scheme is as follows: the mine-used high-strength rapid-setting cement grouting material is composed of A material and B material; the A material comprises the following raw materials in parts by weight: 100 parts of sulphoaluminate cement clinker, 1.3-1.7 parts of building instant glue powder, 1.8-2.0 parts of water reducing agent, 10-20 parts of glass beads, 2.2-2.8 parts of strength agent and 0.1-0.3 parts of tartaric acid; the B material comprises the following raw materials in parts by weight: 40-78 parts of aluminate cement, 3-5 parts of calcium oxide, 0.2-0.7 parts of defoaming agent, 25-45 parts of gypsum and 1.1-1.5 parts of early strength agent. Through the optimized selection of components in the A material and the B material, the initial setting time of the cement grouting material is shortened, and the compressive strength of the cement grouting material reaches more than 30 MPa in one hour.

The utility model belongs to the technical field of underground heat exchange, and particularly relates to a ground source heat pump heat exchange pipe pile which comprises a structural framework composed of longitudinal structural steel bars and spiral stirrups, a heat exchange coil pipe fixed to the structural framework and a concrete pipe body wrapping the structural framework and the heat exchange coil pipe. Preformed holes are evenly formed in the pipe wall of the concrete pipe body, after the prefabricated pipe pile is pressed into the ground, cement paste is poured into gravel around the pipe pile through the preformed holes, gravel concrete is formed, the heat conductivity coefficient, the heat capacity and the mechanical property of the gravel concrete are improved, and the heat conductivity coefficient, the heat capacity and the mechanical property of the gravel concrete are improved. The heat storage capacity of an underground heat exchange field formed by the pile groups is improved, and the heat storage problem in cold regions is solved; and meanwhile, the structural bearing capacity of the structural heat exchange pile can be improved.

The present application relates to the field of cement grouting machine, specifically to an intelligent double-liquid cement grouting machine with constant-speed control motor, which comprises a cement grouting machine body, the outer wall of the cement grouting machine body is fixedly connected with a hinge, one side of the hinge is fixedly connected with a grouting machine opening and closing cover, the other side of the grouting machine opening and closing cover is fixedly connected with an opening and closing bolt assembly, the inside of the cement grouting machine body is provided with a cement suction inlet, the inside of the cement suction inlet is communicated with a cement input pipe, one side of the cement input pipe is provided with a hydraulic motor, the other side of the hydraulic motor is electrically connected with a motor speed limiter, one side of the cement grouting machine body is provided with a controller, and the top of the cement grouting machine body is fixedly connected with a lifting base; the double-liquid partition plate is arranged, so that the two different liquids of the cement grouting machine body can be used separately or mixedly, and the diversity selection when facing different needs is improved.

The invention relates to the technical field of coal mine tunnel support and water disaster prevention and control, and discloses a bolting-grouting water plugging support method for a water-rich fault tunnel, which comprises the following steps: forming a shallow foundation support along with tunneling construction of a common anchor rod; a deep reinforcing anchor rod is constructed in the first lagging aging to form a deep reinforcing support; grouting anchor rods are arranged; and after second lagging aging after tunneling is finished, modified cement grout is prepared for grouting plugging, and the modified cement grout is prepared from Portland cement, water and a composite additive containing aluminate clinker, polyacrylamide and the like. According to the method, through a space-time cooperative control strategy of shallow surface protection deep suspension lagging grouting, repairing is carried out in the optimal window period of fracture development by using the rheological characteristics of surrounding rock; by matching with modified slurry with quick-setting early strength and underwater dispersion resistance, effective cementing and water stopping of broken surrounding rocks in a flowing water environment are realized, the water inflow of a roadway is reduced, and deformation of the surrounding rocks is controlled.

This invention discloses a self-triggered segmented grouting anchoring device and construction method, belonging to the field of roadway floor support technology. The device includes a support unit, a grouting unit, and a triggering unit. The support unit includes an inner tube and an outer tube coaxially nested together. The inner tube is hollow, forming a cement grout channel, and the annular gap between the inner and outer tubes forms a resin grout channel. The grouting unit includes a grouting pump, the outlet of which is connected to the cement grout channel via a cement grout injection pipe and to the resin grout channel via a resin grout injection pipe. The triggering unit is located in the resin grout channel and includes an annular block for sealing the resin grout channel. A through hole is provided on the annular block, and a self-triggered opening valve is provided at the through hole. This invention enables "rigid-to-flexible" sequential grouting, allowing the support rod to automatically initiate secondary grouting reinforcement when the surrounding rock stress reaches a preset threshold, achieving a match between support performance and the mechanical requirements of the surrounding rock.

This invention discloses a novel double-layer pipe roof reinforcement device and its implementation method. The pipe roof consists of two layers arranged in a staggered pattern. A movable sleeve is installed inside the pipe roof, and several steel nails that can pass through the pipe roof are fixed on the sleeve and inserted into the soil under grouting pressure. This effectively expands the reinforcement range of the pipe roof, enhances the self-bearing capacity of the surrounding rock, and achieves a significant reinforcement effect. Furthermore, this invention also discloses an implementation method for using this double-layer pipe roof reinforcement device, including: Step 1: Construction preparation; Step 2: Measurement and layout; Step 3: Installing measuring water pipes or sensors and installing impact drilling tools on the pipe roof steel pipes; Step 4: Installing the first section of steel pipe and starting the drilling rig; Step 5: After advancing 0.5m, verifying the construction parameters and adjusting them before continuing drilling; Step 6: Verifying the pipe roof construction parameters and checking the borehole formation; Step 7: Installing grouting pipes at the ends and filling the pipe roof steel pipes with cement grout; Step 8: Sealing the borehole.