42 results about "Microfine cement" patented technology

The invention relates to the technical field of subway tunnel construction, and discloses a water-rich soft stratum shield short-distance underpass operation subway tunnel construction method which comprises the following steps: S1, stratum advanced pre-reinforcement; s2, optimizing tunneling parameters; s3, posture deviation correction control is carried out; s4, synchronous grouting reinforcement is conducted; s5, a secondary slurry supplementing process; s6, monitoring the existing tunnel; and S7, stratum response monitoring. According to the water-rich soft stratum shield short-distance underneath passing operation subway tunnel construction method, superfine cement-water glass double-liquid slurry and macromolecule nanometer polymers are adopted for alternate grouting, a gradient permeation reinforcing layer is formed, and the problem that traditional water-rich soft stratum single-liquid slurry is prone to dilution is solved; formation resistance, cutterhead torque and soil bin pressure are analyzed in real time based on a BP neural network algorithm, thrust, propelling speed and cutterhead rotating speed are dynamically adjusted, the stability of an excavation face is ensured, the shield axis is controlled to be cheap through pressure feedback of a laser guiding system and a hydraulic oil cylinder, and disturbance to an existing tunnel is reduced.

The invention relates to the technical field of mine filling materials, and provides a low-shrinkage steel slag powder mine filling cementing material and a preparation method and application thereof.The cementing material is prepared from, by weight, 30-40 parts of steel slag powder, 50-60 parts of mineral powder, 8-15 parts of desulfurized gypsum and 0-5 parts of excitant, the excitant is superfine cement clinker, and the specific surface area is larger than or equal to 600 m < 2 > / kg; through a cascade reaction path of early excitation, expansion compensation and continuous enhancement among the components such as the steel slag powder, the mineral powder and the desulfurized gypsum, the filling cementing material which is high in solid waste mixing amount, low in shrinkage and appropriate in strength and has environmental protection benefits and engineering applicability is realized, pollution and carbon are reduced, cost is reduced and benefits are increased for tailing treatment, and the filling cementing material is suitable for being used as a filling cementing material. And the comprehensive utilization way of the tailings and the metallurgical solid waste is further expanded.

The invention provides a grouting-curing-intercepting cross-cut rapid coal uncovering method, and relates to the technical field of cross-cut coal uncovering. The method comprises the steps that drilling topological mapping is conducted on a target area, a connected gas interception and extraction network is constructed, and gas attenuation characteristics are extracted to determine a grouting permeation resistance coefficient; then, a high-pressure grouting dynamic pressurization gradient sequence is formulated, and an in-situ test execution unit is configured in a negative pressure guide reserved area; establishing a process response state diagram containing bag strength, sieve tube smoothness and crack filling test nodes, generating an optimal grouting path by adopting closed-loop feedback logic, and collecting a multiphase flow grouting response data set; and finally, generating a complete solidification curtain map by using the data set, executing a solidification-gas interception collaborative verification decision, and outputting a safe coal uncovering instruction. By means of digital closed-loop control, accurate solidification of superfine cement on coal seam microcracks and efficient interception and extraction of gas are achieved, and the safety and operation efficiency of cross-cut coal uncovering are remarkably improved.

The invention discloses an underground engineering leakage treatment device, which comprises a magnetic leakage stopping slurry containing superfine cement, magnetic powder, an early strength agent, a flocculating agent, a water reducing agent, a water-borne epoxy resin emulsion, an epoxy curing agent and water; the thick iron plate is fixed at the rock wall crack through an expansion fixing bolt, and a grouting space is reserved between the thick iron plate and the permanent magnet; the permanent magnet is wrapped and adsorbed on the thick iron plate through a stainless steel wrapping plate; the grouting pump, the grouting pipe and the expansion fixing bolt are used for fixing the thick iron plate and conveying grout; a handheld drilling and grouting integrated grouting machine comprises a drilling and grouting integrated grouting head, a grout circulation cavity and a circular column permanent magnet, and the grouting head is embedded into a threaded blade and can push the circular column permanent magnet into the deep part of a crack through a boosting rod. When the slope slides, the magnetic base and the iron ore waste residues can quickly respond to form a wall, and the wall becomes a protective barrier.

The invention aims to provide the high-performance subsea tunnel damage repairing material, and the repairing material has excellent bonding strength, erosion resistance, water resistance, mechanical property and durability, and can effectively repair damage and cracks generated in a tunnel. Comprising the following components in parts by weight: 60-73 parts of superfine cement, 5-8 parts of sulphoaluminate cement, 6-8 parts of a CSA expanding agent, 8-12 parts of mineral powder, 8-12 parts of fly ash microspheres, 40 parts of 20-40-mesh quartz sand, 10 parts of 40-70-mesh quartz sand, 30 parts of 70-110-mesh quartz sand, 0.1-0.2 part of a defoaming agent, 25-27 parts of water, 1.5 parts of a water reducing agent, 1-3 parts of nano silicon dioxide, 8-12 parts of PTB emulsion and 1-2 parts of butadiene-styrene rubber powder. When tunnel cracks and damaged parts to be repaired are filled with the crack repairing material, the operation time does not exceed 30 min, the curing time is about 12 h, and the crack repairing material is suitable for operation in a humid environment.

The invention provides a grinding aid composition for improving the grinding efficiency of superfine cement, which comprises the following components in percentage by mass: silicate ester prehydrolysate (30-45% of alkoxy silane, 40-55% of alcohol solvent and 5-10% of acid catalyst), a surface adsorbent (8-12% of triethanolamine or triisopropanolamine), a dispersion stabilizer (2-4% of polycarboxylic acid ether with molecular weight of 2000-5000), and the balance of water. And an optional adjuvant (1-3% of acetylacetone). The preparation method comprises a pre-hydrolysis stage and a compounding stage. During application, the surface adsorbent and cement are premixed, then prehydrolysate is added for common grinding, and the dispersion stabilizer is added in stages. According to the composition, the grinding energy consumption is reduced by 20-30%, the particle aggregation index (CI value) is reduced to below 0.35, the specific surface area of cement reaches 500-800m < 2 > / kg, the compressive strength in 3 days is improved by 20-35%, the compressive strength in 28 days is improved by 10-15%, and the composition is economical and efficient.

The application provides a shaping optimization method of waste concrete recycled aggregate, and belongs to the technical field of green building materials.The broken material of waste concrete is first placed in a saturated salt solution for first soaking to fully soak the surface old mortar of the broken material;when water evaporates, salt crystals are separated out, the crystals break or puff up the surface waste old mortar of the waste concrete, the waste old mortar is conveniently removed, and the stone material interface condition is improved;through grinding and shaping, particle shaping and surface old mortar removal are further realized;through chemical slurry soaking, the chemical slurry is fully absorbed, in the curing process, superfine cement, superfine silica ash and polymers are solidified on the surface cracks and surface of the stone material, the stone material interface performance is further improved, and higher performance concrete is prepared.

The invention provides a low-water-solid-ratio superfine cement grouting material and a preparation method and application thereof, and belongs to the field of grouting materials.The low-water-solid-ratio superfine cement grouting material is prepared from, by weight, 30-40 parts of Q-phase cement clinker, 50-60 parts of sulphoaluminate cement clinker, 10 parts of superfine quartz powder, 0.4-0.8 part of grinding aid and the balance water; wherein the content of the water meets the condition that the water-solid ratio is 0.3-0.5; the main mineral phase in the Q-phase cement clinker is Q-phase mineral and C2S. The micro-crack grouting material is prepared without other additional auxiliaries, the good rheological property, stability and micro-expansion performance are achieved under the low water-solid ratio condition, the process is simple and easy to implement, and reliable technical support is provided for solving the micro-crack grouting problem.

The invention relates to the technical field of pavement coating materials, and particularly discloses a road fog seal material and a preparation method thereof.The road fog seal material is prepared from, by weight, 200-300 parts of modified emulsified asphalt, 30-50 parts of asphalt regenerant, 5-10 parts of penetrant, 10-20 parts of tackifier, 5-10 parts of water, 30-70 parts of sand, 10-30 parts of superfine cement and 15-35 parts of diffusant; the dispersing agent is a terpene unsaturated compound; the modified emulsified asphalt is emulsified asphalt jointly modified by nano glass fibers and polyurethane resin; by adjusting the types and mixing amounts of the raw materials, the prepared fog sealing layer for the road is good in wear resistance, the improvement rate of the water permeability coefficient reaches 100%, the adhesion is excellent, the water damage resistance, wear resistance and skid resistance of the constructed road surface are greatly improved, and the durability of the road surface is improved.

The invention discloses a process and device for improving the productivity of a single well based on targeted filling, pressing and plugging fusion. The process comprises the following steps that S1, a target layer is set; s2, optimizing fracturing parameters; and S3, fracturing the target layer. The device comprises a main cylinder body, a liquid guide pipe located at the front end of the main cylinder body, and two inner cylinder bodies located in the main cylinder body and arranged in a bilateral symmetry mode. Fracturing and water plugging are combined, a horizontal seam is formed at the position of a dominant channel through fracturing, two different plugging liquids are injected in sequence, an optimization formula is provided, a dynamic balance adjusting system is formed according to the viscosity of the two plugging liquids and the length of the seam, and a front plugging liquid stable plugging support with superfine cement as a main component is provided. The post-plugging liquid mainly comprising the organic chromium cross-linking agent is used for plugging a dominant channel near the well end along the end face of the crack, deep targeted filling profile control and flooding are achieved, and the characteristic of high fracturing profile control efficiency is achieved.

The invention relates to a diene gel chemical blocking and channeling sealing agent. The problems that the plugging effect is poor and well cementation accidents are easily caused after an existing superfine cement system is solidified in large pore channel or crack plugging are mainly solved. The adhesive is characterized by comprising the following components in parts by mass: 8-10 parts of acrylamide; 1 to 3 parts of N, N-dimethylacrylamide; 5-6 parts of superfine silicate; 0.1 to 0.5 part of a dissolution promoter; 0.5 to 2.0 parts of a cross-linking agent; 0.1 to 0.3 part of an initiator; 0.1 to 0.2 part of a reinforcing agent and 78 to 85.2 parts of water; the preparation method comprises the following steps: sequentially adding the acrylamide, the N, N-dimethylacrylamide and the dissolution promoter into quantitative clear water according to the formula proportion of the agent, stirring, adding the cross-linking agent and the initiator, continuously stirring, adding the superfine silicate and the enhancer, and stirring and dissolving to obtain uniform liquid. The blocking and channeling sealing agent can improve the field working efficiency, the blocking effect is good after solidification, and well cementation accidents are not prone to being caused.

The present application belongs to the technical field of oil field chemistry, and discloses an oil-water well glue joint composite plugging agent system and application thereof. The components of the oil-water well glue joint composite plugging agent system include a fluid loss reducer and a retarder, and an ultra-fine cement and an epoxy resin curing agent composition with a weight ratio of 73-78:15, wherein the epoxy resin curing agent composition is a mixture of an oily epoxy resin and a curing agent thereof. The oil-water well glue joint composite plugging agent system is mixed with the ultra-fine cement in application, has a compressive strength 1.5-2 times higher than that of conventional Portland cement, a cementing strength 3-5 times higher than that of conventional Portland cement, good temperature resistance and fluid loss control performance, and good stability and pumpability. The present application is suitable for layer sealing and leakage plugging of oil-water wells and gas layer sealing in the process of well repair.

The invention relates to the technical field of cement cementing materials, in particular to a high-titanium blast furnace slag-based low-carbon cementing material and a preparation method thereof. The cementing material is prepared from the following raw materials: superfine cement clinker, a ternary composite admixture and an exciting agent, the ternary composite admixture comprises high titanium blast furnace slag, lithium slag, silica fume and a silane modifier. The high-titanium blast furnace slag is ground high-titanium blast furnace slag, and the content of TiO2 is greater than 10%; the lithium slag is waste slag generated in the process of preparing lithium carbonate through a sulfuric acid method and is subjected to mechanical activation modification through ball milling. The activated high-titanium blast furnace slag, the activated modified lithium slag and other solid wastes are adopted to replace part of cement components to prepare the low-carbon cementing material, a new recycling channel is provided for the high-titanium blast furnace slag and the lithium slag, the cost is low, and high economic benefits are achieved. The high-titanium blast furnace slag-based low-carbon cementing material overcomes the problem of low hydration activity when the high-titanium blast furnace slag micro powder is used as an auxiliary cementing material, and has high early and later strength.

Low-cement concrete. The present invention relates to a fresh concrete composition comprising at least: i) a hydraulic binder comprising: - 20% to 40% by weight of Portland clinker relative to the total weight of said binder, - 45% to 75% by weight of filler relative to the total weight of said binder, and - 5% to 15% by weight of ultrafine aggregate relative to the total weight of said binder, being selected from hydraulic admixtures, pozzolanic admixtures, ultrafine cements and mixtures thereof, ii) at least one superplasticizer or plasticizer, iii) water, and iv) aggregates. Figure for the abstract: None

The invention relates to the technical field of metal mine vertical shaft construction, in particular to a metal mine water-rich rock stratum medium-depth vertical shaft water disaster comprehensive treatment method which comprises the following steps that S1, a dewatering well with the depth larger than or equal to 650 m is arranged, a three-time well completion technology is adopted, hydrological parameters are obtained through high-pressure well washing and three-time water level drawdown tests, and a dewatering well with the depth larger than or equal to 650 m is obtained; the method comprises the following steps of S1, sequentially achieving relay drainage through a working face water collection pit, a hanging scaffold water tank and an intermediate water transfer station, S3, arranging a water interception curtain and a water interception groove, optimizing the concrete proportion and controlling the standing time after pouring, S4, recycling pumped underground water for production and dust falling after treatment, and S5, deploying an optical fiber monitoring system and an automatic drainage control system. By adopting superfine cement (the particle size is smaller than or equal to 1.25 microns) and modified urea resin double grout, the water plugging rate is increased to 95% or above from 60%-70% of a traditional method, a transient electromagnetic method and a geological radar method are combined for detection (the precision is + / -5 m), advanced early warning of 100 m is achieved, grouting reinforcement measures are taken 3 days in advance, and lagging water inrush accidents are avoided.

The invention relates to the technical field of inorganic materials, in particular to a high-strength inorganic airtight reinforcing material and a preparation method of the high-strength inorganic airtight reinforcing material. The component A comprises the following components in parts by mass: 35-45 parts of silicate superfine cement, 10-15 parts of pozzolanic superfine cement, 10-15 parts of fly ash, 5-10 parts of bentonite, 4-5 parts of silica fume, 0.2-0.5 part of microfibers, 2-5 parts of a waterproof agent and 0.5-1 part of a water reducing agent; the component B comprises the following components in parts by weight: 10-15 parts of water glass, 2-5 parts of silica sol, 0.2-0.5 part of an anti-salt agent and water; a component C: 0.5-1 part of environmental response type functional microspheres; through combination of the environmental response type functional microspheres and the inorganic reinforcing material, when the grouting material is applied to water-absorbing rock stratum geology, a water loss path can be blocked, water migration can be reduced, the water loss rate of the grouting material can be effectively controlled, and the situation of swelling instability caused by excessive water absorption of a rock stratum is prevented.

The invention relates to a multi-stage hole sealing method for an in-situ heat injection extraction drill hole. The technical problems that existing hole sealing is insufficient in depth and low in grouting pressure are solved. According to the technical scheme, the multi-stage hole sealing method comprises the following steps that (1) the total hole sealing length is designed according to the requirement of a roadway surrounding rock stress zone, and the total hole sealing length is divided into seven sections; (2) a grouting pipe and a grouting material are selected, the pipe diameter of the grouting pipe is smaller than the hole diameter of the drill hole, four grouting openings are formed in a first-stage plugging section of the grouting pipe, two low-pressure explosion valves are arranged on a second-stage plugging section, and a high-pressure explosion valve is arranged on a high-pressure plugging section; (3) hole sealing: a, binding a grouting pipe and a hole sealing pipe and feeding the grouting pipe and the hole sealing pipe into a drill hole; b, the four first-stage plugging sections are filled firstly, when the first-stage plugging sections are formed, the two second-stage plugging sections are filled, and when the second-stage plugging sections are formed, the second-stage plugging sections are filled; superfine cement is poured into the high-pressure plugging section to form the high-pressure plugging section; and c, the pressure for pouring the plugging material is increased step by step.

The invention relates to the technical field of fabricated structure waterproofing, and particularly discloses a laminated subway station side wall splicing seam waterproof structure and a construction method thereof.The waterproof structure comprises stepped connecting parts which are arranged on an upper side wall and a lower side wall and matched with each other; the upper side wall and the lower side wall are spliced through a connecting part and form a step-shaped splicing seam; the waterproof material is filled in the splicing seam; the water stop baffles are arranged in the upper side wall and the lower side wall and can separate the splicing seams; the waterproof coiled material is integrally laid on one side of the upper side wall and one side of the lower side wall; the inflation sealing body, the superfine cement, the compression sealing body and the polyurethane sealant are sequentially filled in the splicing seam. Through the combination of various waterproof structures and modes such as the water stop baffle, the waterproof coiled material and the waterproof material, a tight waterproof system is formed, the waterproof effect of combining rigidity and softness and mainly preventing is achieved, the waterproof effect of the side wall splicing seam is effectively improved, and it is guaranteed that the side wall splicing seam is long in service life and efficient in water prevention.

The invention discloses a superfine coal-based solid waste green grouting material based on double gel synergy and a preparation method, and relates to the technical field of grouting of geotechnical engineering and mining engineering. The material is prepared from 40-60 parts of superfine coal-based solid waste powder, 30-50 parts of superfine Portland cement, a Ca / Si ratio regulator, a polycarboxylic acid water reducer and a composite functional additive, coal gangue is activated through a multi-stage process of raw material screening, mechanical crushing, high-temperature calcination, superfine grinding, component optimization and chemical catalysis, high-activity powder with the particle size D95 being smaller than or equal to 10 microns and the active component being larger than or equal to 70% is formed, and the high-activity powder with the particle size D95 being smaller than or equal to 10 microns and the active component being larger than or equal to 70% is obtained. And compounding with superfine cement to form a C-S-H and N-A-S-H double-gel interpenetrating network. When the slurry is prepared, the water-cement ratio is controlled to be 0.35-0.55 through step-by-step stirring, and the apparent viscosity is smaller than or equal to 0.5 Pas. The material has both early strength and long-term strength, and is high in coal-based solid waste mixing amount and low in carbon emission. The performance bottleneck of a single gel system is broken through, efficient utilization of the coal gangue and green upgrading of the grouting material are achieved, and the grouting material is suitable for reinforcement and water plugging of geotechnical engineering such as mines and tunnels.

The present invention belongs to the field of surrounding rock stability control technology, and specifically relates to a stress control and tunnel protection method for pre-grouting reinforcement of a stop-mining line tunnel, comprising: excavating a new tunnel between the stop-mining line of the working face and the protected main tunnel; constructing multiple groups of grouting holes on both sides of the new tunnel; injecting ultrafine cement slurry into the surrounding rocks on both sides through the grouting holes to form a corresponding surrounding rock grouting reinforcement range; after the working face advances to the stop-mining line, a support withdrawal channel is formed, and the top and side surrounding rocks of the support withdrawal channel are all within the grouting reinforcement range. The present invention simultaneously reinforces the stop-mining line support withdrawal channel and the main tunnel protective coal pillar, and the bearing capacity of the coal pillar is enhanced, which can effectively support the overlying rock layer and avoid the transfer of mining stress caused by the crushing of the coal pillar; on the other hand, the newly excavated tunnel absorbs a considerable amount of energy through its own deformation, which plays a pressure relief role. By combining pressure control and pressure relief, stress regulation is achieved, thereby playing a protective role for the main tunnel.

The application discloses a kind of high mechanical performance geopolymer grouting water plugging materials, raw materials include as follows weight parts of raw materials: cement 10-300 parts, ultrafine cement 10-260 parts, fine aggregate 10-260 parts, bentonite 10-130 parts, polyurethane 5-146 parts, acrylate polymer 5-60 parts, waterproof agent 1-10 parts, polypropylene fiber 2-8 parts, antioxidant 1-4 parts, tunnel grouting water plugging material is adjusted by water reducing agent, and its water-binder ratio is 0.4.The grouting water plugging material of the application is synergized by cement, ultrafine cement, fine aggregate, bentonite, polyurethane, acrylate polymer, waterproof agent, polypropylene fiber and antioxidant, which significantly enhances the tensile strength, toughness and durability of the material.The polypropylene fiber forms a three-dimensional network structure inside the material, effectively enhancing the tensile strength and toughness.

The application belongs to the technical field of geotechnical engineering, and particularly relates to a nano-carbon enhanced ultra-fine cement-based blocking material and a preparation method and application thereof. The prepared ultra-fine cement-based blocking material is prepared by uniformly mixing cement 45-50 parts, solid waste sintered active material 0.5-2.5 parts, water reducing agent 0-0.05 parts, carbon nanotube 0.015-0.1 parts, carbon quantum dot 1% solution 0.5-2.5 parts and water 45-50 parts. The material has low porosity and is not dispersed. The material has strong injectability and can penetrate into small pores. The material has high strength, high bonding and reinforcing strength for broken rock, and has wide application prospect.

The invention discloses a mine tiny crack treatment method, and belongs to the technical field of mine water disaster prevention and control. The invention provides a complete treatment method for mine tiny cracks. The method comprises the steps of feature classification, material optimization, grouting process, grouting parameter and effect evaluation and the like. Dividing micro fracture types according to fracture characteristics; drilling holes for grouting of the working face adopt an inner and outer ring hole distribution mode, a grouting material of first-order holes is selected from cement-water glass slurry capable of being solidified under water flow scouring, and a grouting material of second-order holes is selected from modified superfine cement; during backwall grouting, the grouting drill holes are divided into a large-small crack composite water gushing type and a small crack water spraying type according to treatment types, and the grouting drill holes are distributed in a plum blossom shape; wherein the large-small crack composite water gushing type is consistent with the working face grouting type; and the grouting material of the first-order hole of the micro-crack water spraying type wall post-grouting is selected from modified superfine cement, and the grouting material of the second-order hole is selected from modified urea resin, so that the grouting efficiency is improved, the water inflow is reduced, and the rock mass stability is enhanced.

This application relates to the field of cementitious materials, and particularly to an ultra-fine cement-based composite cementitious material for underground mine filling and its preparation method. The ultra-fine cement-based composite cementitious material for underground mine filling, in parts by mass, comprises the following raw materials: 50-70 parts of ultra-fine cement, 20-30 parts of tailings sand, 10-15 parts of modified desulfurized gypsum, 5-12 parts of fly ash, 8-16 parts of modified resin, 0.5-1.5 parts of reinforcing agent, 0.4-1.2 parts of water reducing agent, 5-15 parts of fiber material, and 40-60 parts of water. The ultra-fine cement-based composite cementitious material prepared in this application not only has excellent mechanical strength and a low shrinkage rate, but also can ensure good water resistance and impermeability performance, thus effectively meeting the diverse performance requirements of the existing mining industry for mine filling materials, expanding the application environment of the ultra-fine cement-based composite cementitious material, and having a very excellent application prospect.

The application provides a plugging agent for treating annular pressure, and a preparation method and application thereof. The plugging agent comprises urease activity liquid and superfine cement plugging paste. The urease activity liquid comprises urease-producing bacteria liquid and / or urease liquid, and is used for inducing the production of carbonate. The superfine cement plugging paste comprises superfine cement base material and calcium-containing early strength agent, and the average particle size D 50 of the superfine cement base material is ≤30 μm. The volume ratio of the urease activity liquid to the superfine cement plugging paste is (2-4):1. The plastic viscosity of the plugging agent is 5-30 mpa·s. The plugging agent provided by the application can effectively plug small-size micro cracks, improve the treatment effect of annular pressure, improve environmental protection, reduce production and construction operation cost, and is conducive to large-scale popularization and application.

The present application relates to the technical field of tunnel construction, and more particularly to a construction method for intelligent management and control of risks of surface and underground in the process of passing through poor geological zones, which uses advanced geological prediction and field survey data to detect positions such as fault fracture zones and weathered alteration deep grooves, and divides shallow buried sections, water-rich pressurized sections and non-pressurized sections, adopts superfine cement-water glass double-liquid grouting, long pipe shed and steel support disposal for different poor geologies, builds a BIM model and calculates the construction disturbance transmission range based on the internal friction angle of the stratum, and accordingly builds a risk coupling mapping diagram with the surface risk source, adopts earth pressure shield construction for balance excavation for the water-rich pressurized section, adopts double-shield TBM construction for the non-pressurized section and switches to drilling and blasting auxiliary mode when joint fracture zones are encountered, and adjusts the excavation speed and grouting parameters through real-time monitoring data combined with the risk coupling mapping diagram, thereby realizing the coordinated and safe management and control of the surface and the underground in complex environments.

The invention provides a steel lining structure for reinforcing and leaking stoppage of an existing structure and a construction method, and relates to the technical field of municipal engineering, the steel lining structure comprises a supporting layer, a filling layer and a contact layer, and the supporting layer is a closed or semi-closed lining structure formed by splicing a plurality of corrugated steel plates; the contact layer is a waterproof coating layer coated on the inner wall of the existing thermal pipe ditch; the filling layer is a superfine cement paste layer poured between the supporting layer and the contact layer. The design of the contact layer can avoid the leaking stoppage failure problems that a traditional concrete lining is poor in bonding and prone to cracking; the supporting layer solves the problems that a traditional integral prefabricated lining is long in construction period and high in cost, and the supporting layer can adapt to old pipe ditches of different sizes by adjusting the splicing mode. The corrugated structure of the corrugated steel plate can resist stress generated by settlement and temperature change of the pipe ditch, the problem that a traditional lining is prone to being damaged is solved, the dual purposes of reinforcing and leaking stoppage are finally achieved, and construction convenience, adaptability and stability are considered.

The invention discloses a reinforcing method for a fault fracture zone in TBM construction, and belongs to the technical field of tunnel construction engineering. Comprising the steps that the grouting reinforcement range is determined according to geological parameters such as the width of a fracture zone, the fracture development degree and the underground water condition, then a composite grouting material containing superfine cement, nano-silicon dioxide and a water glass solution is prepared, and material components and performance parameters are adjusted according to the fracture development degree and the underground water pressure; a segmented retreating grouting technology is adopted, grouting hole sets are formed in the tunneling direction at intervals, high-pressure grouting is conducted on holes in the outermost side to form a closed curtain, then layered grouting is conducted on holes in the inner layer, and after the grouting amount reaches a design value 80%, grout is supplemented to the design value after initial setting; the outer layer of the composite reinforced structure is a cement-silicon dioxide crystal layer, and the inner layer of the composite reinforced structure is a nano-silicon dioxide modified reinforced layer. The method can effectively enhance the surrounding rock stability of the fault fracture zone, and is suitable for stratum reinforcement when the TBM tunnel passes through the fault fracture zone.

The application belongs to the technical field of grouting materials, and particularly relates to a polypropylene fiber reinforced ultra-fine cement-based grouting full-length anchoring material and a preparation method thereof. The grouting full-length anchoring material comprises 950-1050 mass parts of reference cement, 2-2.5 mass parts of a water reducing agent, 80-100 mass parts of an expanding agent, 35-65 mass parts of a quick-setting agent and 1-7 mass parts of polypropylene fibers. Compared with the existing cement grouting material, the grouting material has high slurry stability, good fluidity, strong injectability, almost no weeping phenomenon, and as an anchoring agent, the grouting material has higher anchoring strength, enhanced coordinated deformation capacity and better durability in the full-length grouting system.

This application relates to a plugging agent, its preparation method, and its application, belonging to the field of petrochemical production technology. The raw material components of the plugging agent include: ultrafine cement, modified resin, tartaric acid-intercalated hydrotalcite, a fluid loss reducing agent, a dispersant, and a solvent. The diameter of the ultrafine cement is 0.1 μm to 1 μm; wherein, by weight, the ultrafine cement is 47 to 53 parts, the modified resin is 10 to 20 parts, the tartaric acid-intercalated hydrotalcite is 0.2 to 0.4 parts, the fluid loss reducing agent is 1.2 to 1.5 parts, the dispersant is 0.4 to 0.6 parts, and the solvent is 33 to 37 parts. The plugging agent provided by this application overcomes the problems of weak retention, poor bonding, and short shelf life of conventional plugging agents, thereby improving the plugging performance and thus improving the repair performance of casing damage.