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3090 results about "Cement paste" patented technology

System and control method for automatically compounding cement paste

The invention discloses an automatic grout mixing system and the control method thereof. The invention is characterized in that the system comprises a micro processor (1); the micro processor (1) is connected with a man-machine interface (2), a hydro cylinder magnetic valve for dust-discharging valve (5) and a densitometer (4) respectively over a wire. The hydro cylinder magnetic valve for dust-discharging valve (5) is connected with the dust-discharging valve (3). An angular displacement sensor for dust-discharging valve (6) is arranged on the dust-discharging valve (3). The density of the grout can be controlled in the following procedures of collecting data, setting density, normalizing set density and actual density, interrupting the timing, adopting the current valve location of the dust-discharging valve as the antecedent of PID integrate, calculating the PID based on the result of the normalization of the set and actual density; adopting the difference between PID output value and the valve location of the dust-discharging valve as valve location deviation, comparing the valve location deviation with a dead area and the action of flow control over the hydro cylinder magnetic valve of the dust-discharging valve performed by an output switch. Therefore, the density of the grout can be accurately controlled. The automatic grout mixing system is easy to operate and can automatically control the dynamic density.
Owner:YANTAI JEREH PETROLEUM EQUIP & TECH CO LTD

Device and method for preparing nitrogen foam cement

The invention discloses a device and method for preparing nitrogen foam cement. The preparing device comprises a foam cement producer, a liquid nitrogen evaporator, a liquid nitrogen plunger pump, a foam liquid plunger pump, a foam liquid tank, a heat exchange system, a liquid nitrogen pipeline, a high-pressure cement paste pipeline, a first pipeline, a foam cement discharge pipeline and a densitydetecting device. The heat generated by a power unit, a hydraulic system and other devices in a nitrogen foam well fixing device is recovered through the heat exchange system, the recovered heat is used as a heat source of the liquid nitrogen evaporator, energy conservation and environment protection are realized, the energy utilization rate is high, and equipment input is low. Liquid nitrogen and foam liquid are pressurized through a high-pressure liquid nitrogen plunger pump and a high-pressure foam liquid plunger pump, the mixing uniformity is increased, and the density of foam cement is reduced. The density of the foam cement is detected in real time through the density detecting device, the flow of the liquid nitrogen and/or foam liquid is adjusted according to the density, and the density is simply controlled. By arranging a clear water tank, after operation ends, the equipment and pipelines are flushed, and the service life is polonged.
Owner:YANTAI JEREH PETROLEUM EQUIP & TECH CO LTD

Preparation method of star polycarboxylic acid high-performance water reducing agent

ActiveCN102887979AExtended Dionon Design-Structure-PropertyExpanding the theoretical connotation of the design-structure-performance of moleculesWater reducerPollution
The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.
Owner:GUIZHOU DR SHI TECH

Bionic concrete artificial fish reef and preparation method thereof

The invention discloses a bionic concrete artificial fish reef arranged on the seafloor. According to the fish reef, C40 concrete is used for pouring to form an artificial fish reef base body, the surface of the base body is covered with a protective layer which is composed of cement mortar, biological calcium carbonate and oyster shells, the biological calcium carbonate is made of eggshells, corals, seashells and fishbone and is used as an additive to be added into the cement mortar, the cement mortar mixture is smeared on the surface of the fish reef base body to form cement paste after the biological calcium carbonate and the cement mortar are evenly stirred together, and the oyster shells are inlaid in the cement paste in a convex face outward mode. According to the artificial fish reef, the environment-friendly function, the durable function and the trapping function are integrated, the cement mortar covering layer doped with the biological calcium carbonate and the coating of the oyster shells can attract marine organisms to inhabit, and thus the trapping effect of the artificial fish reef can be better achieved; compared with a traditional concrete fish reef, the artificial fish reef has good waterproof property and chloride ion resistance, surface roughness and alkalinity of the surface of the fish reef are appropriate, bionic performance is achieved, and the fish collecting effect is excellent.
Owner:GUANGDONG UNIV OF TECH +1

Method for directly synthesizing pure solid high-performance polycarboxylate water-reducer in one step

The invention relates to a method for directly synthesizing a pure solid high-performance polycarboxylate water-reducer in one step, belonging to the field of water-reducers. According to the method, the pure solid high-performance polycarboxylate water-reducer is prepared by taking an acrylic compound and unsaturated polyoxyethylene ether as polymerization reaction monomers, adding a molecular weight regulator and carrying out free-radical polymerization reaction under the action of an initiator and under a solvent-free environment. The method disclosed by the invention is strong in controllability, high in polymerization degree, low in cost, environment-friendly and pollution-free, achieves the purpose of preparing the absolutely anhydrous pure solid polycarboxylate water-reducer by bulk polymerization, not only has the fluidity and holding property of cement paste, cement adaptability and concrete application performance which are similar to those of a polycarboxylate water-reducer prepared from a common solution by polymerization and can be prepared into any concentration of solution according to actual demands as the pure solid high-performance polycarboxylate water-reducer prepared by direct polymerization is an anhydrous pure solid, but also is free of postprocessing working procedures, such as heat drying or solvent separation and is more convenient to transport, saved in transport cost and favorable in market competitiveness and application prospect.
Owner:HUIZHOU JIANKE IND

Method for exchanging tool of shield machine for tunnel construction

The invention discloses a method for exchanging a tool of a shield machine for tunnel construction, which comprises the steps of: (1) soil cabin replacement filling: performing the process of soil cabin replacement filling by using a spiral excavating machine and a slip casting system synchronously working with the spiral excavating machine; (2) advanced slip casting inside the machine: beating a plurality of slip casting pipes into the soil on the upper part of the shield machine from inner to outer inside the shield machine by respectively passing through a plurality of advanced geologic holes and then synchronously injecting cement paste into the soil on the upper part of the shield machine through the slip casting pipes by using a slip casting device till the cement paste cannot be injected any more; (3) cleaning cabin and exchanging tool synchronously: manually cleaning the cement plaster solidified inside the soil cabin and synchronously exchanging the tool mounted on the shield machine; and (4) getting rid of the difficult position of the shield machine and recovering the process. The method provided by the invention has the advantages of reasonable design, convenience for operation, low cost, high safety factor, good use effect and capable of solving the problem that the tool cannot be exchanged in the traditional tool exchanging mode under severe tool exchanging conditions.
Owner:URBAN RAIL TRANSIT ENG CO LTD OF CHINA RAILWAY FIRST GRP CO LTD +1

Fishbone-shaped anchor rod

The invention relates to a fishbone-shaped anchor rod. The fishbone-shaped anchor rod comprises an anchor head, an anchor rod body and a sleeve pipe. A movable conical propelling body is arranged in the anchor head and connected to the front end of the anchor rod body through a thread. The anchor head is connected to the front end of the sleeve pipe through a thread. Spine holes are evenly distributed in the anchor head and internally provided with short-rod-shaped anchor head bore spines. Two or more pairs of fishbone-shaped blade mechanisms are evenly distributed on the anchor rod body. Each blade mechanism comprises blades and a clamp. When the fishbone-shaped anchor rod is not used, the blades are folded, abut against the anchor rod body and are located in the sleeve pipe. When the fishbone-shaped anchor rod is used, a roof bolter rotates forwards, and the fishbone-shaped anchor rod is drilled into rock soil. Pressure is exerted on the rear end of the anchor rod body, the propelling body in the anchor head extrudes the anchor head bore spines out of the anchor head, and the anchor head bore spines are embedded in a rock soil body. The roof bolter rotates reversely till the sleeve pipe is separated from the anchor head. Then, outward pull force is provided for the anchor rod body till the blades evenly distributed on the anchor rod body are in a completely unfolded state. Finally, a grouting machine is aligned with the anchor rod body and pours cement paste into the anchor rod body till a cavity between the anchor rod body and the rock soil body is completely filled. Then, installation of the anchor rod body is finished.
Owner:HEFEI UNIV OF TECH

Synthesis method of polycarboxylic acid high-performance water reducing agent of star-like structure

ActiveCN102911322AExtended Dionon Design-Structure-PropertyExpanding the theoretical connotation of the design-structure-performance of moleculesSynthesis methodsPolyethylene glycol
The invention discloses a synthesis method of a polycarboxylic acid high-performance water reducing agent of a star-like structure, belonging to the field of a water reducing agent. According to the synthesis method, polybasic alcohol, (methyl) acrylic acid, a polyethylene glycol compound and the like are used as esterification raw materials, and the polycarboxylic acid high-performance water reducing agent of the star-like structure is prepared through a sequential esterification and polymerization method, i.e., the (methyl) acrylic acid and the polybasic alcohol are used as reactants, a star-like polymerizable active end is prepared through esterification reaction under the action of a catalyst, and then the polycarboxylic acid high-performance water reducing agent is prepared from the star-like polymerizable active end and esterification macromolecule, a molecular weight regulator and an unsaturated carboxylic acid monomer under the action of an initiator through free radical polymerization reaction. The synthesis method has the advantages of simplicity, easiness in control, high polymerization degree, low cost, no pollution, capability of realizing the polycarboxylic acid high-performance water reducing agent of the star-like structure connected with a plurality of polycarboxylic acid molecules, and more superior cement paste fluidity and holding capacity, good cement adaptability and concrete application performance compared with the conventional linear and comb-shaped polycarboxylic acid water reducing agent in the case of normal and low added amount.
Owner:GUIZHOU DR SHI TECH

Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers

InactiveCN102181020AReduce dependenceEnrich the means of synthesizing polycarboxylate high-performance water reducerCarboxylic acidControllability
The invention discloses a method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers, belonging to the field of water reducer. In the invention, the polycarboxylic acid high-property water reducer material is prepared by a method of first amidation and second copolymerization, namely, taking a (methyl) acrylic monomer and methoxyl polyoxyethylene ether with the other end containing amino as reactant, preparing a polymerizable monomer by amidation reaction under the action of catalyst, then copolymerizing the polymerizable monomer with the (methyl) acrylic monomer and a chain transfer monomer in water solution under the action of initiator, and then neutralizing with alkaline solution, thus preparing the polycarboxylic acid high-property water reducer. The method is low in cost, environment-friendly and free from pollution and achieves high polymerization degree and strong controllability; by copolymerization of amidated active monomer, an amide structure is introduced into the molecular structure of polycarboxylic acid water reducer, cement can obtain good flowing property, the flowing capacity maintaining capability of neat cement paste is improved obviously, excellent cement adaptivity is shown, and excellent flowing effect can be obtained under low doping quantity and low water-ash ratio.
Owner:BEIJING UNIV OF TECH

Method for extracting gas from separation layer below overlying strata, draining water and grouting through combined drill hole

The invention discloses a method for extracting gas from a separation layer below an overlying strata, draining water and grouting through a combined drill hole and belongs to a mine disaster prevention method. The method for extracting gas from the separation layer below the overlying strata, draining water and grouting through the combined drill hole includes that installing a drill site at a transportation roadway of a preparatory work face adjacent to a coalface, constructing the combined drill hole in the part about to generate the separation layer below the overlying strata above the gob of the coalface in a mode of keeping away from a caving zone, wherein the combined drill hole is composed of an inside gas extraction pipe and a water draining-grouting pipe; after the separation layer is generated, preventing the mine disaster according to the stages that firstly, draining water from the separation layer through the combined drill hole; secondly, after the gas is gathered in the separation layer after the water in the separation layer is emptied, using the primary combined drill hole to extract the gas from the separation layer; finally, after the water and gas are completely drained and extracted from the separation layer, filling cement paste to the separation layer through the primary combined drill hole. The method for extracting gas from the separation layer below the overlying strata, draining water and grouting through the combined drill hole is capable of solving the mine disasters of water bursting in mine, gas outburst (gas emission), rock burst, surface subsidence and the like through the combined drill hole, the separation layer water and gas extraction rate is high, and the grouting effect is good.
Owner:CHINA UNIV OF MINING & TECH

High-temperature-resistant copolymer oil well cement retarder and preparation method thereof

ActiveCN104403056AImprove performanceSolve the problem of severe subsidence at high temperatureDrilling compositionPolymer scienceFumaric acid
The invention relates to a high-temperature-resistant copolymer oil well cement retarder and a preparation method thereof. The preparation method comprises: respectively weighing four polymerization monomers such as 2-acrylamide-2-methylpropanesulfonic acid, diallyldimethylammonium chloride, maleic anhydride or itaconic acid or fumaric acid, and acrylic acid or methacrylic acid according to the mass ratio of 45-80:5-17:7-18:8-20, dissolving the first three monomers in water, then adding sodium polyphosphate and diphenylcarbazide, then successively adding a chain transfer reagent and an initiator, and finally dropwise adding the forth monomer, performing heating reaction and adjusting the pH value, so as to obtain the copolymer retarder. The invention also provides the high-temperature-resistant copolymer oil well cement retarder prepared by the above preparation method. The retarder is resistant to a high temperature up to 230 DEG C and is weak in dispersibility at a high temperature, the cement paste strength develops fast at a low temperature, the addition amount of the retarder has good linear relation with the cement paste hardening time, and the cement paste comprehensive performance is good.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1

Intelligent and high-efficiency brick paving machine

The invention refers to an intelligent and high-efficiency brick paving machine comprising a walking track and a trolley body arranged on the walking track; the trolley body is composed of a transmission mechanism, a three-dimensional brick-transmission mechanism, a roller brushing mechanism, a cam locking mechanism, a hexagonal brick placing mechanism, a brick compaction mechanism and a control module. The transmission mechanism is used for transmitting power to the track, the three-dimensional brick-transmission mechanism, the cam locking mechanism, the hexagonal brick placing mechanism and the like. The three-dimensional brick-transmission mechanism is used for separating the vertically-piled bricks and delivering the bricks forwards one by one. During transmission of the bricks, the roller brushing mechanism is used for smearing cement paste to backs of the bricks uniformly. The hexagonal brick placing mechanism is used for continuously and exactly putting the bricks on the floor from an upper place. The bricks are evenly pressed and compacted by the compaction mechanism. The control module is used for controlling the operation of the whole machine. The brick paving job can be finished by the intelligent and high-efficiency brick paving machine instead of human beings, time and effort are saved, and meanwhile, the brick paving quality is ensured.
Owner:程明

Self-compacting concrete

The invention relates to self-compacting concrete which is used for overcoming the contradiction between flowability and stability, early strength and delayed coagulation, contraction and expansion and the like of the self-compacting concrete in the prior art. In the invention, by means of combination of an aliphatic (hydroxyl) sulfonate superplasticizer and a polycarboxylic acid superplasticizer, selection and collocation of a cementing material and coarse and fine aggregates as well as specific mix design, the self-compacting concrete (more than C40) with low consumption of the cementing material is prepared from coal ash, mineral powder and tailings, wherein, a ketoaldehyde condensate is taken as the main component of the aliphatic (hydroxyl) sulfonate superplasticizer; and when the superplasticizer is added to cement paste, the mixed concrete has the advantages of good construction workability, less possibility of bleeding and segregation, no crystallization precipitate at low temperature and the like. Compared with the prior art, the self-compacting concrete prepared by the method provided by the invention has the advantages of lowering cement consumption by at least 70kg / m<3>, reducing consumption of the cementing material by at least 70kg / m<3>, comprehensively utilizing at least 470kg / m<3> of solid waste, and lowering concrete cost by at least **yuan / m<3>.
Owner:北京中联新航建材有限公司 +1

Evaluation device and method capable of eccentricity testing of cementation quality of well cementation first interface

ActiveCN106761679AEvaluate cement qualityConstructionsWell cementingColloid
The invention discloses an evaluation device and method capable of eccentricity testing of cementation quality of a cement-casing interface. The cement-casing interface is a well cementation first interface. Currently, evaluation of the first interface only considers the cementation situation of the outer surface of a casing and a cement ring, however, in a realistic multi-drilled well bore structure, cementation exists between the inner surface of the casing and the cement ring, and the cementation quality between the inner surface of the casing and the cement ring also determines the success or not of cement ring sealing. Besides, when consideration is given to the inner and outer surfaces, consideration also needs to be given to the influence of eccentricity of the casing on cementation. Aiming at the problems, according to the solving scheme, the technology and working condition well cementation on the spot are simulated as far as possible, including forming of mud cake, washing, downhole maintenance of cement, downhole pressure and temperature and the like. The evaluation device and method capable of eccentricity testing of cementation quality of the cement-casing interface are high in simulation degree, can evaluate the cementation situation of the outer surface of the casing and the cement, can simulate the casing cementation situation of random degrees of eccentricity, and can simulate the plugging strength of slug injection of colloids of cement paste and the like. An experimental result and analysis can provide important reference for the evaluation of cementation quality of the well cementation first interface, provide important basis for an engineering design, and can be applied to the evaluation of cementation strength of other material systems and the casing as well.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)

Layered hydraulic fracturing method of underground coal mine multiple coal seams

InactiveCN103174453ASolve the shortage of decompression and antireflectionFix bugsFluid removalGas removalHydraulic fracturingHigh pressure water
The invention discloses a layered hydraulic fracturing method of underground coal mine multiple coal seams. The layered hydraulic fracturing method of the underground coal mine multiple coal seams is suitable for layered air-permeability-increasing operation in soft and low-air-permeability coal seam groups and includes the following steps: (1) punching a hydraulic fracturing drilling hole penetrating all coal seams; (2) installing a coal seam hydraulic fracturing sleeve pipe in the hole, and then fixing the hole to the bottom with cement paste; (3) in the mode of hole sealing with capsules, sealing the hole to a top plate of the coal seam to be fractured, and then through a high-pressure sealing drill rod, sending a special perforating gun to the coal seam to be fractured in the hole; (4) calibrating the position of the perforating gun, aiming at the coal seam to be fractured, through the high-pressure sealing drill rod, pumping perforating liquid to the perforating gun to shoot through the sleeve pipe and a cement sheath, and a perforating orifice is formed in the coal seam; (5) taking the perforating gun and the high-pressure sealing drilling rod out of the sleeve pipe; (6) leading high-pressure water in the sleeve pipe to carry out hydraulic fracturing on the coal seam in the position of the perforating orifice; and (7) after a coal seam is fractured, repeating the steps (3) to (6) to carry out hydraulic fracturing on a next coal seam until all the coal seams are fractured. Effective pressure relief and air-permeability increasing in layered coal seam groups can be achieved, and the method of the underground coal mine multiple coal seam layered hydraulic fracturing is simple, good in effect and low in cost.
Owner:CHONGQING UNIV
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