36results about How to "Act as an anchor" patented technology

The present invention discloses a mutually embedded slope protection block, which is composed of a top side, a bottom side, a front side, a back side, a left side and a right side, wherein, a mutually embedded structure is arranged on the front or back side or the left or right side for adjacent blocks, however, all the mutually embedded sides on the mutually embedded structure are a slope inclined to the block from the bottom to the top. The present invention also discloses a construction method for constructing the slope protection with blocks, and the method is described below: the protection slope is tamped, an inverted filter is paved on the protection slope and a mutually embedded protection slope block is paved, anchoring rods are inserted into holes on the mutually embedded protection slope and plantation soil or gravel is refilled in the grass plantation hole or the gravel filling hole. The present invention makes the protection slope which is adapted free of uneven settlement or frost heaving and deformation after the mutually embedded side becomes a slope to ensure security and reliability of the slope protection system.

The invention discloses a method for improving the binding force of a plating layer of a neodymium-iron-boron magnet and a neodymium-iron-boron magnet electroplating piece. The method comprises the steps that firstly, a neodymium-iron-boron semi-finished product workblank is subjected to multi-thread slicing to obtain neodymium-iron-boron semi-finished product slices, then the neodymium-iron-boronsemi-finished product slices are subjected to chamfering, deoiling, washing, acid pickling, ultrasonic wave washing, excitation and washing, and finally the neodymium-iron-boron semi-finished productslices are subjected to electroplating treatment, so that the neodymium-iron-boron magnet electroplating piece is obtained. The method provided by the invention improves the bonding force of the plating layer of the neodymium-iron-boron magnet and the corrosion resistance of the magnet, has high production efficiency and low production cost, and can be applied to automatic production.

The invention discloses a long-time cell membrane imaging agent, which is characterized by comprising a component A and a component B. The component A is a glycol chitosan polymer with the side chain containing biotin and a hydrophobic unit; and the component B is an avidin molecule grafted with fluorescein isothiocyanate FITC. The cell membrane imaging reagent provided by the invention has good biological compatibility and good imaging effect, and can stay on the cell membrane for a long time without being swallowed, and can be used as a novel cell membrane imaging agent.

The invention discloses an abnormal wall integral anchor-pouring anchor rod, which comprises a steel pipe body drilled with eyelets, wherein an exposed section of the steel pipe body is processed with screw threads, and the wall thickness of the end of the exposed section of the steel pipe body is enlarged so that the steel pipe body becomes an abnormal wall steel pipe; the front end of the steel pipe is processed into a braided shape and is used as the anchoring end; and a reducing part of the steel pipe body is in a convex ring shape. The anchor rod has the advantages that the front end of the steel pipe is provided with the anchoring end to play a role of the anchor rod and prevent the abnormal wall steel pipe from rushing out of a bore hole in the process of slip casting; the exposed section of the steel pipe is processed with the screw threads after the wall thickness thereof is enlarged so as to ensure the effective wall thickness of the exposed section of a slip-casting anchor rod and enhance the tensile strength thereof so that the abnormal wall steel pipe plays the role of the anchor rod and plays the role of the slip casting; the wall thickness of the externally exposed end, and the tensile strength is enhanced, thus the anchoring force is improved; and because a convex ring at the reducing part plays a role of a check ring, a stop-grouting plug has good leak tightness, and slurry is not thrown up in the slip casting.

The invention relates to a floating waterborne photovoltaic solar azimuth tracking system, which comprises a photovoltaic array, a rotation guide rail, gear teeth and drive devices. The photovoltaic array is circular. The photovoltaic array is peripherally equipped with the rotation guide rail. The rotation guide rail is provided with the gear teeth. The photovoltaic array is peripherally providedwith the drive devices uniformly. Each drive device comprises a pile, a buoyancy tank, a motor, a driving wheel and a connection shaft. The piles are hit into the bottom portion of a reservoir; the top portion of each pile is provided with a circular slot; an up-down-running-through circular hole is reserved in each buoyancy tank; and the connection shaft is in the shape of an umbrella, and is formed by an umbrella pole and an umbrella hat. The beneficial effects are that the system is suitable for different solar azimuths by adjusting direction of a photovoltaic assembly so as to improve power generating efficiency; and when water level changes, the buoyancy tank at the photovoltaic array side and the buoyancy tanks at the drive device sides float up and down with the change of the waterlevel, so that the driving wheels are allowed to be always in the same plane with the rotation guide rail.

The invention discloses a construction method of a pre-stressed anchor cable frame beam structure, and relates to the technical field of slope support. The construction method comprises the following steps that 1, a side slope is excavated; 2, after the side slope is excavated, anchor holes are formed in the side slope, the hole opening positions of the anchor holes are marked at a node A and a node B, and the node A and the node B are both located in the center of the intersection position of a cross beam and a vertical beam in a prefabricated frame beam; 3, anchor holes are drilled, anchor cable bodies are installed, and then anchor hole grouting is conducted; 4, after anchor hole grouting is completed, a frame beam foundation trench is excavated, and a frame beam is constructed; 5, after frame beam construction is completed, the anchor cables are tensioned and locked; and 6, after the anchor cables are tensioned and locked, grout supplementing and anchor sealing are conducted on the anchor head. By the adoption of the scheme, the pre-stressed anchor cables can be combined with the frame beams, the frame beams play a role of anchorage piers, and due to the fact that the effective contact area of the frame beams and the slope surface is large, deformation of the slope body under the action of the anchor cables can be limited.

The invention, which relates to the field of mine hydrogeology, discloses a method for treating a water-absorbing heaving floor of a bottom plate of a coal mining roadway. The method comprises the following steps: step one, observing a heaving floor of a bottom plate of a roadway to obtain a maximum height h of the heaving floor and a coordinate of the plane at which the maximum height is located;step two, carrying out slip casting and hole drilling on two bottom corners of the bottom plate the roadway; step three, carrying out slip casting reinforcement through the slip-casting drilling hole; step four, carrying out water-drawing hole drilling on the bottom plate the roadway and arranging a water pumping pipe and a floral tube in the water-drawing hole; step five, arranging sensors at the top plate and two sides of the roadway; step six, laying a vacuum pumping system on the bottom plate the roadway; step seven, starting the vacuum pumping system; step eight, stopping water pumping after reaching a water-drawing stopping standard; step nine, filling sedimentation, caused by the water pumping, of the bottom plate the roadway; and step ten, at coal mine tunneling and exploitation stages, repeating the steps from the step six to the step nine until scrap of the roadway under the condition of reaching the h by the height of the heaving floor. According to the invention, vacuum water pumping is carried out on the heaving floor, so that the water-absorbing expansion is eliminated.

The invention discloses a distributed monitoring device and monitoring method of internal stress of a tunnel surrounding rock, and a construction method. The device comprises a supporting rod member and a coupling base arranged on the outer side of the supporting rod member, a plurality of first grooves and second grooves arranged in a stagger manner are formed in an outer side wall of the coupling base along the circumferential direction, and sensing optical fibers are uniformly distributed in each second groove. The method comprises the steps of: deploying the distributed monitoring device of the internal stress of the tunnel surrounding rock in a drill hole of the tunnel surrounding rock; after the distributed monitoring device of the internal stress of the tunnel surrounding rock is deployed in the drill hole of the tunnel surrounding rock, performing hole sealing slip casting treatment on the drill hole of the surrounding rock; generating, by the sensing optical fibers located inthe monitoring device in the drill hole of the surrounding rock, Brillouin backscattering after being subjected to a longitudinal or lateral stress change; and after a Brillouin scattering measuring instrument measures the change amount of the sensing optical fibers, performing data analysis to determine the stress change position and size of the internal stress of the surrounding rock along the direction.

The invention discloses a method for constructing a hybrid catalyst and cascade degradation of an organophosphorus nerve poison by fixing palladium and organophosphorus hydrolase by using COFs (Covalent Organic Frameworks), and the method comprises the following steps of: preparing a hydroxyl-containing covalent organic framework material from a monomer with triazinyl and a monomer with hydroxyl by using a hot solvent method; fixing palladium in situ into holes of the covalent organic framework material by using a two-phase method, and then carrying out carboxylation modification and activation; and finally, performing mixing with an OPH solution for enzyme immobilization to obtain the hybrid catalyst. The palladium nanoparticles and the organophosphorus hydrolase are co-immobilized on the covalent organic framework, so that the stability of the palladium nanoparticles and the organophosphorus hydrolase in the use process is improved. Specifically, the palladium nanoparticles are located in the pores, the enzyme is located on the surface, and the structure can ensure the accessibility of each chemical component and avoid mutual inhibition of different catalysts. The constructed hybrid catalyst is used for cascade degradation of the organophosphorus nerve poison, the degradation efficiency is high, degradation is more thorough, and the hybrid catalyst can be repeatedly used.

The invention discloses an anchor-pulling construction method suitable for sedimentation deformation of an overlaying soil layer of a shallow-buried tunnel. The anchor-pulling construction method comprises the following steps that 1, pretreatment before tunnel excavation is conducted; 2, a grouting anchoring rod is constructed on each of the left portion and the right portion of the spandrel position of the overlaying soil layer of the tunnel; 3, foundation beams are constructed nearby the ground surface above the tunnel to fix anchoring heads of the anchoring rods; and 4, the tunnel is excavated through an upper-middle-lower three-step method. According to the anchor-pulling construction method, the anchoring rods are constructed on the spandrel position of the tunnel and connected with the foundation beams, anchoring force is exerted to the overlaying soil layer of the tunnel, and thus anchor-pulling effect is achieved; effective strengthening is conducted for avoiding loosening, andthe very good limiting and reducing effects are achieved on sedimentation deformation of the overlaying soil layer of the stratum shallow-buried tunnel; and the construction method is short in construction period, low in manufacturing cost and high in construction efficiency, unbalanced force generated in tunnel excavation can be dissipated, the strain state is adjusted, development of deformation is slowed down, the self-constraining effect is achieved, and the very good practical value is achieved.

The invention provides a large-mining-height rib-spalling-preventing coal anchoring and roof grouting device and a use method thereof. The coal anchoring and roof grouting device comprises a groutingpipe, bags and a blasting structure. The grouting pipe is a grouting liquid channel; the bags are arranged on the periphery of the grouting pipe; first grout outlets are formed in the positions, corresponding to the bags, of the grouting pipe; grouting liquid in the grouting pipe flows into the bags from the grout outlets; the grouting liquid in the bags flows out of the bags from small holes; andthe blasting structure is arranged at the end part of the grouting pipe and used for being opened to allow the grouting liquid to pass when the grouting pressure reaches a set value. A small amount of the grouting liquid is diffused to a hole sealing section through the small holes to fragmentize a coal body, and the fragmentized coal body is cemented, so that the anchoring effect is achieved; when the pressure of the grouting liquid reaches a certain value, the blasting structure is opened, and the grouting liquid with a certain pressure is injected into the cementing position of the coal body and a roof and diffuses towards the broken roof along the cementing surface, so that the effect of directionally reinforcing the broken roof and the coal wall is achieved; and therefore, the occurrence of a rib spalling accident is prevented.

The invention discloses a reducing self-adaptive expansion grouting device and a reinforcing method for the cracking and breaking position of a tunnel second liner. The device comprises a body and a damper. The damper is arranged on the end portion of the body. The body is overall of a tubular structure, and the body is sequentially provided with a grout outflow section, a first expansion section,a second expansion section and a grouting section in the direction away from the damper. Multiple grout outlets are evenly distributed in the grout outflow section. The diameter after expansion of the first expansion section is larger than that of the second expansion section. By means of the grouting device, compaction grouting and splitting grouting can be simultaneously achieved, and by meansof compaction and splitting filling, the overall strength and the safety of reinforced surrounding rocks are improved.

The invention discloses a method for reinforcing a concrete structure with a prestressed FRP batten embedded at the end. The method comprises the following steps that (1) grooving is carried out, andparticularly, the two ends of the tension side of the concrete structure to be reinforced are symmetrically provided with end grooves with the same number; (2) an FRP batten pressing device is installed at the end of the concrete structure; (3) the FRP batten is tensioned through tensioning equipment, prestress is applied to the FRP batten, the two ends of the FRP batten are pressed into the end grooves at the two ends of the concrete structure by the FRP batten pressing device, and the interiors of the end grooves and the surfaces between the end grooves corresponding to the concrete structure are filled with adhesive; and 4, prestress is released after the adhesive is cured, and the FRP batten pressing device is dismantled. The reinforcing effect is good, the damage to the existing structure is small, and the engineering cost is obviously reduced.

The invention discloses a system and a method for adjusting seepage water pressure in a slope with a variable water level. The system comprises a water collecting anchor pipe at least partially arranged in the slope, a driver and a drainage pipe connected with the driver and the water collecting anchor pipe; when the water level drops, water in the water collecting anchor pipe enters the driver through the drainage pipe and is discharged through the driver; the method comprises the following steps: water level decline internal seepage water pressure adjustment is conducted; according to water level decline internal seepage water pressure adjustment, when the reservoir water level declines, decline of the underground water level in the slope lags behind the water level outside the slope, water in the water collecting anchor pipe is discharged under the combined action of suction force and pressure difference, and the water level in the slope is lowered. The system for adjusting seepage water pressure in the slope with the variable water level has the advantages that disturbance to the undisturbed soil body of the bank slope is small, underground water in the slope body above the reservoir water level can be synchronously discharged along with descending of reservoir water, the outward seepage water pressure in the bank slope is effectively reduced, and the stability of the bank slope is improved.

The invention relates to a concrete pile durability repairing module, and belongs to the technical field of concrete foundation piles. The concrete pile durability repairing module comprises a plurality of repairing units and connecting rods for connecting the repairing units in series sequentially. Each repairing unit comprises a shell and a positioning ring, wherein the shell is of a columnar structure and has a fan-shaped annular cross section. The connecting rods are positioned in the shells and connect the shells in series sequentially in the length direction of the shells. Material injection holes are formed in the arc side surfaces of the shells. The two inclined side surfaces and the bottom side surface of each shell are provided with a plurality of seepage holes which are uniformly distributed in the two inclined side surfaces and the bottom side surface of the shell. Springs are fixedly arranged at the two ends of each connecting rod. The repairing module provided by the invention can be used for quickly repairing a concrete pile underwater, can position and repair a part to be repaired more easily, improves the repairing efficiency of the concrete pile, and has a betterrepairing effect.

The invention provides joint mortar for improving durability of a new and old concrete joint surface, and relates to the technical field of concrete construction, the joint mortar comprises the following raw materials by weight: 300-500 parts of Portland cement, 60-150 parts of a mineral admixture, 500-900 parts of quartz sand, 50-100 parts of a self-repairing microcapsule, 3-8 parts of modified fiber, and 5-20 parts of a polycarboxylic acid powder water reducer. According to the new and old concrete pouring time interval, the water-binder ratio of the joint mortar at different pouring time differences is reasonably determined, and the joint quality of the joint surface is effectively guaranteed. Through optimal design of the self-repairing microcapsules and the modified fibers, the bonding strength of the joint surface is improved, and the joint mortar is endowed with self-repairing capability and inhibits development of damage to the joint surface, so that the aim of improving the durability of the new and old concrete joint surface is fulfilled.

A new uncoupled backfill support method for steel frames in roadways with complex broken surrounding rocks, including a trapezoidal steel support module for supporting the roadway, the support method also includes an uncoupled backfill process module, the uncoupled backfill The process module is used to increase the initial service cycle of the roadway. The uncoupled backfill process module includes the roadway overexcavation process module before the trapezoidal steel support is erected, and the log backfill process module after the trapezoidal steel support is erected. The roadway over-excavation process module also includes a reinforced vertical board process module, and the log backfill process module also includes a pre-dimension window process module. The roadway over-excavation process module is used to actively release the pressure and can be erected Before the support of the trapezoidal steel bracket, the pressure relief space is reserved in advance, and the roadway is drilled and blasted. After the blasting, it is trimmed with tools such as pneumatic picks to make the two sides of the roadway a continuous surface. The falling scum is cleaned up.

The invention discloses a biodegradable stent system for a branch blood vessel at a bifurcation. The biodegradable stent system for the branch blood vessel at the bifurcation comprises a biodegradablestent and a heteromorphic saccule. The biodegradable stent comprises a stent support part extended along the branch blood vessel and used for placing in the branch blood vessel; and a stent fixing part positioned at the bottom of the stent support part and used for anchoring at the connection part of a main blood vessel and the branch blood vessel. The heteromorphic saccule comprises a saccule fixing part extending along the main blood vessel and tightly adhered to the main blood vessel; and a saccule support part connected with the saccule fixing part and installed at the inner side of the stent support part, wherein the saccule support part is capable of supporting the external expansion of the stent support part, so the stent support part can be tightly adhered to the branch blood vessel. The above biodegradable stent system is capable of, through pressing the heteromorphic saccule to cause the plastic deformation of the stent fixing part so that the saccule fixing part is tightlyadhered to the main blood vessel wall, ensuring the complete cover of the biodegradable stent to the branch blood vessel lesion, preventing the stent fixing part from hindering the blood flow of the main blood vessel, and avoiding the stent displacement caused by the long-term impact of the blood flow of the branch blood vessel.

The invention discloses a medicine-applying filming support. The medicine-applying filming support comprises a supporting body, an inner film and an outer film. The inner film is closely attached to an inner cavity of the support body and fixedly connected with the support body; filming areas are formed in the portions, provided with the inner film, of the support body, the outer film is wound around the support body relative to the outer surface of the filming areas, and the support body is firmly wrapped by the outer film in the middle of the inner film and the outer film; bare support areas are formed in the portions, not provided with the inner film, of the support body, and the bare support areas and the filming areas are sequentially and alternately arranged. According to the medicine-applying filming support, the bending performance of the filming support is improved through the filming mode; meanwhile, the wall attaching performance and the stability of the filming support are improved, and the problem that the filming support is prone to shifting is effectively solved. The inner cavity of the film is coated with anticoagulation medicine, and thrombosis is reduced; the whole outer wall of the filming support is loaded with medicine for inhibiting smooth-muscle-cell proliferation and migration, and restenosis of the inside and the two ends of the postoperation support cavity is effectively prevented.

The invention discloses a basalt fiber reinforced high-speed steel rail polishing grinding stone and a preparation method thereof. The raw material of the grinding stone contains modified basalt fibers, and a modification method of the basalt fibers comprises the steps that the basalt fibers are subjected to high-temperature baking, then soaked and etched with a NaOH solution, dried after being soaked and etched, then soaked with an alcoholic solution containing a silane coupling agent KH550 and dried after being soaked. and drying after soaking. A millstone can be prepared by mixing, molding and sintering the raw materials of the millstone. The polishing grinding stone has the advantages of high strength, high toughness and strong exposure capability. The grinding amount of the grinding stone is large, the abrasion loss is small, the spark amount is large and even in the grinding process, the grinding temperature is low, the ground steel rail is good in surface quality, and the steel rail is not prone to being burnt.

The invention discloses an integrated electromagnetic head structure, relates to the field of automobile variable-speed hydraulic electromagnetic valves, and aims to solve the problems that a traditional electromagnetic head structure has a large number of parts and high assembly requirements, and complex part shapes are needed to maintain an inverted magnetic path. According to the technical scheme, the integrated electromagnetic head structure is characterized by comprising a shell, a blocking iron is arranged in the shell, a sliding hole is formed in the middle of the blocking iron, an armature push rod is arranged in the sliding hole, and the side wall of the armature push rod is provided with a cascade ring groove which makes the armature push rod be dumbbell-shaped. According to theintegrated electromagnetic head structure, the structure of the electromagnetic head is simplified, a traditional armature, a valve core push rod and a pole shoe are integrated into a stepped core part, namely the armature push rod, so that the number of parts can be reduced. The armature push rod is made of the same material as an armature and plays the role of the armature, the structure can bemoved directly, complicated reverse magnetic paths are not needed, and assembly requirements are greatly reduced.

The present invention discloses a mutually embedded slope protection block, which is composed of a top side, a bottom side, a front side, a back side, a left side and a right side, wherein, a mutually embedded structure is arranged on the front or back side or the left or right side for adjacent blocks, however, all the mutually embedded sides on the mutually embedded structure are a slope inclined to the block from the bottom to the top. The present invention also discloses a construction method for constructing the slope protection with blocks, and the method is described below: the protection slope is tamped, an inverted filter is paved on the protection slope and a mutually embedded protection slope block is paved, anchoring rods are inserted into holes on the mutually embedded protection slope and plantation soil or gravel is refilled in the grass plantation hole or the gravel filling hole. The present invention makes the protection slope which is adapted free of uneven settlement or frost heaving and deformation after the mutually embedded side becomes a slope to ensure security and reliability of the slope protection system.

The invention relates to the technical field of decorative materials, and discloses a metal sheet material with a texture decorative effect and a manufacturing method thereof. The metal sheet materialis obtained by the following steps: (1) The slurry is coated or poured into a textured silicone mold to form a surface decoration layer, and the thickness of the coating or perfusion is 1-3 mm; (2) Warm the surface decoration layer to 50-150 DEG C until the surface decoration layer is in a semi-cured state; (3) Apply a 0.2-1 mm thick slurry layer on the non-textured back of the semi-cured surfacedecorative layer, and the metal sheet (frame) with holes is pressed on the slurry layer until the metal sheet (frame) with holes is solidified and formed. A variety of surface decorative layers withdecorative effects can be formed by silicone molds. Then, the semi-cured surface decorative layer is coated with the slurry and press-fastened with the perforated metal sheet (frame), and after the hole of the metal sheet (frame) is solidified after the slurry is filled, the perforated metal sheet (frame) can serve as an anchor after the slurry is solidified, so that the surface material is firmlyconnected with the metal plate (frame), and the perforated metal sheet (frame) also has a breathable effect.

The invention discloses a different-diameter self-adaptive expansion grouting device and a reinforcement method for the cracked and damaged part of the second lining of the tunnel. It includes a body and a damper, and the damper is arranged at the end of the body; In the direction of the damper, the slurry outlet section, the first expansion section, the second expansion section and the grouting section are arranged in sequence; several slurry outlet holes are evenly distributed on the slurry outlet section; the expanded diameter of the first expansion section greater than the expanded diameter of the second expansion section. The grouting device can realize compacting grouting and splitting grouting at the same time, and improves the overall strength and stability of the reinforced surrounding rock through compacting and splitting filling.

The invention discloses a long-line fishing bait hanging machine which comprises a line hook assembly, a bait hanging machine body and an anchoring weight. The line hook assembly comprises a hook collecting rod, a pay-off basin, a plurality of fishhooks, main lines and a plurality of sub-lines, the top of the pay-off basin is of an opening structure, the hook collecting rod is located above the pay-off basin, and the fishhooks are arranged on the hook collecting rod at equal intervals; and the main lines are placed in the pay-off basin at equal intervals, one end of each of the multiple sub-lines is fixedly connected with the corresponding fishhook, and the end, away from the corresponding fishhook, of each of the multiple sub-lines is fixedly connected with one end of the corresponding main line. The long-line fishing bait hanging machine is reasonable in design and good in practicability, the problems that in the existing long-line fishing process, baits are not fresh easily, the requirement for manual operation of workers is high, the requirement for the degree of skill of the workers is high, and the conditions that fishhooks fall off easily, the baits fall off and the fishhooks stab or scrape the hands easily occur can be solved, the automatic bait hanging function is achieved, the pulling amount of the workers is reduced, and the working efficiency is improved.

The invention discloses a spun expanded steel pipe pile. The spun expanded steel pipe pile comprises a hollow pile foundation body, the outer circumferential surface of the front end of the pile foundation body is provided with continuous helical blades, and the front end of the pile foundation body is provided with a forwards-protruded drilling cutter. The spun expanded steel pipe pile can provide with a building above with great vertical support force, greatly improve the construction efficiency and meanwhile ensure integral perpendicularity during construction.

A novel steel frame non-coupling backfill supporting method for a complex broken surrounding rock roadway is provided, in which a trapezoid steel support erecting module used for supporting the roadway and a non-coupling backfill process module used for prolonging the initial service period of the roadway are used. The non-coupling backfill process module comprises a roadway over-excavation process module before the trapezoidal steel support is erected and a log backfilling process module after the trapezoidal steel support is erected, the roadway over-excavation process module further comprises a reinforced vertical plate process module, and the log backfilling process module further comprises a pre-maintenance window process module; the roadway over-excavation process module is used for actively releasing pressure, reserving a pressure relief space in advance before a trapezoid steel support is erected, conducting drilling blasting on a roadway, conducting trimming through tools such as an air pick after blasting, enabling the two sides of the roadway to become continuous upper faces, and cleaning dropped scum after overexcavation is finished.

The invention discloses a high-pressure-resistant reverse needle valve. The valve comprises a valve body, a valve core, an elastic piece and a valve rod, wherein the surfaces of the valve core, the elastic piece and the valve rod are coated with anticorrosive coatings, and the anticorrosive coatings comprise, by weight in parts, 10-30 parts of acrylic resin, 20-40 parts of epoxy resin, 4-8 parts of curing agents, 2.5-5 parts of titanium dioxide nanofibers, 0.5-1.5 parts of coupling agents, and 30-50 parts of deionized water. The epoxy resin can be cured and cross-linked to produce a firm and stable net structure, the epoxy resin structure contains hydroxyl and ether bonds with extremely high polarity, and therefore, the coatings are excellent in heat resistance and corrosion resistance, and have good heat resistance, wear resistance, high pressure resistance and corrosion resistance effects. The titanium dioxide nanofibers have excellent corrosion resistance while capable of being usedas coating filler, and can effectively improve the corrosion resistance of the coating. In addition, the titanium dioxide nanofibers can also play a role in anchoring in the net structure, thereby further improving the stability of the coating.

The invention, which relates to the field of mine hydrogeology, discloses a method for treating a water-absorbing heaving floor of a bottom plate of a coal mining roadway. The method comprises the following steps: step one, observing a heaving floor of a bottom plate of a roadway to obtain a maximum height h of the heaving floor and a coordinate of the plane at which the maximum height is located;step two, carrying out slip casting and hole drilling on two bottom corners of the bottom plate the roadway; step three, carrying out slip casting reinforcement through the slip-casting drilling hole; step four, carrying out water-drawing hole drilling on the bottom plate the roadway and arranging a water pumping pipe and a floral tube in the water-drawing hole; step five, arranging sensors at the top plate and two sides of the roadway; step six, laying a vacuum pumping system on the bottom plate the roadway; step seven, starting the vacuum pumping system; step eight, stopping water pumping after reaching a water-drawing stopping standard; step nine, filling sedimentation, caused by the water pumping, of the bottom plate the roadway; and step ten, at coal mine tunneling and exploitation stages, repeating the steps from the step six to the step nine until scrap of the roadway under the condition of reaching the h by the height of the heaving floor. According to the invention, vacuum water pumping is carried out on the heaving floor, so that the water-absorbing expansion is eliminated.

The invention discloses a double-anchoring and double-packing tie-back system for staged fracturing string. The double-anchoring and double-packing tie-back system comprises a first tie-back plug, a tie-back barrel and a second tie-back plug, a first anchoring device is arranged on the first tie-back plug and comprises a locking slip. A plurality of locking grooves are formed in one end of the locking slip, one end of each locking groove is open, and a simply supported beam structure is formed; a self-locking male buckle is further arranged on the locking slip; a self-locking female buckle is arranged on the inner wall of the tie-back barrel, the tie-back barrel is detachably connected with the locking slip through a locking groove of the locking slip and is locked with the self-locking male buckle through the self-locking female buckle, the lower end of the tie-back barrel is connected with a lower end pipe column, and an anti-retreating slip and a packer are sequentially arranged on the lower end pipe column from top to bottom. The upper end of the second tie-back plug is connected with the lower end of the lower-end pipe column, and the lower end of the second tie-back plug is further connected with another tie-back barrel in an anchoring mode. The double-anchoring design is adopted, the standby releasing function and the standby packing function are achieved, the use reliability of the tool is improved, and the construction risk is reduced.