916results about How to "Economically reasonable" patented technology

An automated loan underwriting system and method automates the logic implemented by a loan underwriter, saving the loan originator time and money. Each lending institution can set up its own decisioning criteria, enabling customers to customize the process in which a proper evaluation, owners and encumbrance report, or title product is selected for a loan application within a given set of characteristics. The system and method allow for the automatic upgrading to another product without involvement of the loan processor, helping to reduce time delays in the loan origination process. The speed and automation allow for more underwriting checks to be applied against each loan.

A control system for a wind power plant that includes a damage module and a control module. The damage module compares existing stress conditions on one or more component parts of the wind power plant to current energy generating costs. The control module alters electric power generated by the wind power plant based upon the comparison.

The invention discloses a power grid optimal planning method of a large-scale grid-connected wind farm, comprising the following steps of: step 1, obtaining net rack planning data, system operation predication data and wind power planning data; step 2, constructing a calculation model comprising a target function and a constraint condition of the model; step 3, setting calculation parameters; and step 4, inputting the net rack planning data, the system operation predication data and the wind power planning data, which are obtained by the step 1, and three parameters set by the step 3 into the calculation model constructed in the step 2; utilizing optimization algorithms including a Benders decomposition method, a branch and bound method and the like to solve through a computer. According to the method provided by the invention, a 'peak property' of wind power output is considered and the economic rationality of a power grid optimal planning scheme is ensured through allowing a wind power output peak value with a smaller probability; and the method provided by the invention comprehensively considers two aspects on newly-constructed line investment and wind power comprehensive benefits, and simultaneously ensures the line utilization rate and the wind power comprehensive benefits.

The invention discloses a preliminary bracing construction method for a tunnel with surrounding rocks containing collapsible loess and soft rocks. The method includes the following steps that a plurality of layers of advanced pipe sheds are arranged on a collapsible loess layer, and a single layer of advanced pipe shed is arranged on a soft rock layer; after the advanced pipe shed is set up, a working face is closed through sprayed concrete, a system anchor bolt is arranged on the soft rock layer, a foot locking small guide pipe is arranged at the arch springing position of the tunnel, and grouting is conducted on the rocks through permeation of the system anchor bolt and the foot locking small guide pipe; a pre-fabricated reinforcing mesh is paved on a concrete initial spraying layer formed by concrete initial spraying in a fluctuation mode, and a reinforcing mesh arranged at the collapsible loess layer is encrypted; a steel arch support is set on the collapsible loess layer, a reinforcing steel bar grid is set up at the soft rock layer, and the connecting position of the reinforcing steel bar grid and the steel arch support is welded; repeated spraying is conducted by adopting concrete spraying, and construction of tunnel preliminary bracing is finished. By means of the method, stress releasing and deformation coordination of two layers of surrounding rocks can be well controlled, operability is good, construction cost is low, and the safety is good.

The invention belongs to the technical field of zeolite molecular sieves, in particular to a method for adjusting a surface hole diameter of a ZSM-5 molecular sieve by surface dealuminizing and compensating silicon. The invention accurately controls the surface hole diameter of the molecular sieve by using the treating measure of dealuminizing and compensating silicon on the ZSM-5 zeolite molecular sieve with ammonium fluosilicate solution. An ultrathin layer enriched with silicon is formed on the surface of the ZSM-5 zeolite molecular sieve treated by the method so that the hole caliber on the surface of the molecular sieve is shrunk. The ZSM-5 zeolite molecular sieves with different hole caliber shrinkage level can be selectively obtained by changing different treating conditions. The SM-5 zeolite molecular sieves modified by the method can be used for absorbing a mixture of three isomerides of P-, M-and O-Xylene.

The invention discloses a steel trussed beam and flexible arch construction method with vault pushing, which comprises the following steps of: building an assembly support in the side span of a steel trussed beam, assembling a guide beam and the steel trussed beam into an integral space on the assembly support, arranging a horizontal continuous jack and a mechanical, electrical and hydraulic control system on the assembly support, pushing the steel trussed beam forward by using the horizontal jack, and continuing next round of assembly work on the rear assembly support whenever one round is pushed forward. By using the steel trussed beam and flexible arch construction method with vault pushing provided by the invention, the steel trussed beam and the flexible arch are erected outside the operating limit of a highway, and the construction difficult across the highway is solved.

The invention discloses a method for treating antibiotic wastewater and belongs to the field of wastewater treatment. The treatment method comprises the following steps: pre-treatment, hydrolysis and acidification, bioaugmentation-based first-stage treatment, Fenton oxidation and biological advanced treatment. The method is applied to treat wastewater from antibiotic production, works with high efficiency, ensures that the effluent quality is safe and stable and meets the requirements listed in the water quality standard GB / T18920-2002, and can achieve the purposes of beneficial cycle of water resources and green production in enterprises.

The invention provides a soil conditioner used for treating heavy metal pollution. The soil conditioner comprises the following chemical components by weight: 40 to 60% of CaO, 20 to 30% of SiO2, 3 to 10% of MgO and 10 to 30% of other non-functional mineral elements consisting of Al2O3 and Fe2O3. Polluted soil contains the following heavy metals: no more than 5 ppm of mercury, no more than 10 ppm of cadmium, no more than 10 ppm of arsenic, no more than 50 ppm of lead and no more than 50 ppm of chromium. The soil conditioner is prepared from a calcareous raw material, a magnesian raw material, a siliceous material and flux minerals through batching, raw grinding, sintering, grinding after cooking, detection and packaging after detection is passed. According to testing results, the soil conditioner can completely passivate and chelate soil containing less than 20 ppm of cadmium, enables yield to be increased by more than 30%, particularly guarantees agricultural products produced by obstructed soil reach the standard within 20 to 30 years and poses no adverse influence to the microbial populations, enzyme and granular structure of soil.

The invention relates to a drip irrigation under a film of a fruit tree and root field microenvironment regulation and controlling integrated method. The method comrpsies: firstly opening a regulation and control delve on the anterior limb projected on the fruit tree canopy ground, laying a seeding raising film on the lateral surface and the bottom part of the regulation and controlling delve, and placing filling materials on the seeding raising film; then disposing a drip irrigation pipe along the fruit tree row according to duplex tubes or three tubes; and laying the ground film along both sides of the tree row, covering the drip irrigation pipe and the regulation and controlling delve, and compacting with soil. Through the invention, the water and fertilizer integration drip irrigated under the film, watering and manuring automation as well as the water and fertilizer slow release and growth control and flower promotion regulated and controlled at the root field microenvironment are combined together, the root system range of the fruit tree is controlled at a certain volume, the nutrient is released in the delve through regulating and controlling the soil moisture percentage, ground temperature, fertilizer and the like of the root field, the growing development of hair root is promoted, vegetative growth and reproductive growth process above the ground part is regulated, and the hair root is regulated and controlled within the range of the delve to reach the function of coronal controlling and flower promotion. The method is simple, practical, economic and reasonable, and is a fruit tree root field microenvironment regulation and controlling integrated method with ecological environment protection and water and fertilizer conservation.

The invention discloses a method which applies in a PLC control system to implement calcium spraying and desulfurization inside a circulating fluidized bed boiler, comprising the steps that outsourcing desulfurizer is transported and stored; a star unloader is used for feeding, a solid flowmeter is used for measuring, and a helicoidal pump is used for transporting; powder lot is blown into the boiler for calcination and desulfurization by a lobe fan; a flue gas SO2 sampling device is arranged on a chimney, the concentration value of SO2 which is measured by a monitor is uploaded to the monitoring network of environment protecting department in a wireless way by a data collecting instrument, at the same time, the concentration value of SO2 is transmitted to the PLC control system by the on-line monitor of the SO2; the frequency conversion rotating speed of a motor of the unloader in controlled by the PLC, so that the desulfurizer can be automatically added; wherein, the instantaneous and integrated flow of the solid flowmeter is transmitted to the monitoring network of environment protecting department by the PLC for being referred in real time. The method realizes the automatic control of a desulfurization system and on-line monitoring of the usage of limestone powder in real time, at the same time, the desulfurization efficiency is improved, thus remarkably saving the usage of limestone powder, reducing the running cost, and simultaneously lightening the labor intensity of operating staffs.

The invention discloses a method for testing the cable force of a PC steel strand stay cable, which is used for testing steel strands individually stretched by the equal tension method. The method comprises the following steps of: obtaining the actual effective tension force of each steel strand based on the actual extension amount and the actual anchorage tension force before anchoring the steel strands; obtaining the linear regression equation of the steel strands according to the actual tension sequence number and the actual effective tension force of the steel strands; obtaining the effective tension force representative value of each anchored steel strand; and multiplying the effective tension representative value of the last stretched steel strand by the number of the steel strands to obtain the cable force of the stay cable. The invention also provides a method for monitoring the cable force of a PC steel strand stay cable in the construction process based on the testing method. On the basis of reasonably using the linear regression analytical method, the invention establishes a method for evaluating the stretching state of the PC steel strand stay cable, thereby effectively solving the problem that the cable force state of a stretched PC steel strand stay cable can not be evaluated by only the traditional testing method.

The invention particularly discloses a construction method for a mine shaft through multilayer goaf, which solves the problem of blankness of the construction method for the conventional mine shaft through goaf. The method comprises the following steps that: 1) the ground and the underground space of the goaf are detected; 2) mechanical analysis is performed on a rock stratum of the goaf; 3) a goaf filling range and filler mechanical property are determined; 4) bedrock is tunneled; 5) a related underground chamber which is integrally connected with a shaft is constructed; and 6) the goaf is filled and reinforced. The construction method fills the blank of the construction method for the shaft through goaf; back filling injection, filling and reinforcing technology is used during the construction of a through goaf of a vertical shaft; the construction method has an advanced, economic and rational technology; the goaf can be completely closed; return current is prevented from entering the goaf, so a coal seam of the goaf has a tendency to spontaneous combustion; thus safe and reliable use of the shaft is guaranteed.

The invention discloses a segmental hoisting process of an ultra-large-span steel truss. The process includes the following steps that (1) vertical lifting devices of the steel truss are built; (2) the whole steel truss is divided into a plurality of sections, and each section of the steel truss is assembled on the ground; (3) the sections of the steel truss are placed on the corresponding vertical lifting devices respectively; (4) each section of the steel truss is sequentially lifted to a proper elevation and is fixed through a temporary fixing supporting device; (5) after measurement and collection are carried out, the sections of the steel truss are combined to form a whole aloft. The segmental hoisting process effectively solves the problem that installation is limited by conditions, is simple and convenient to operate, safe and reliable, guarantees installation safety and quality, and meanwhile is economical, reasonable and advanced in technique. Compared with a common large hoister hanging and spare part installation process, the segmental hoisting process is safe, convenient to achieve, economical and efficient.

The invention provides a method for extracting germanium from high-impurity low-grade complex zinc oxide powder, and belongs to the technical field of hydrometallurgical processes. The method comprises the following steps of: under the process conditions that the PH value is 0.5 to 1.5 and the temperature is 55 to 75 DEG C, adding sulfite into aqueous solution of zinc sulfate which contains 8,000to 15,000mg / L iron, 300 to 1,000mg / L Fe<3>, and 30 to 135mg / L germanium so as to convert Fe<3> into Fe<2>, complexing and precipitating the germanium by adopting tannic acid to ensure that the germanium in the aqueous solution of zinc sulfate is subjected to a phase change reaction to form [GeO(C75H52O46)2<2>], pretreating, and calcining in a calcining kiln to obtain a germanium concentrate with the germanium content of between 8 and 22.36 percent which is used for producing germanium series products; and removing iron from solution of zinc sulfate obtained after the separation, and feeding into the conventional electrolytic zinc production system to recover valuable metals such as zinc, cadmium, indium and the like. By the method, the interference of the Fe<3> to a multi-metal recovery system can be effectively avoided, the production cost is reduced, and the smooth production process flow is ensured. The method has great significance for comprehensively recovering and recycling the valuable metals in low-grade high-impurity complex zinc oxide raw materials.

The invention discloses baked bricks of riverslakes sludge and municipal sludge and a production method thereof. The baked brick comprises a brick body and a cavity, and the brick body is prepared bythe following raw materials in weight percent: 40-70% of riverslakes sludge, 10-35% of municipal sludge and 13-30% of internal fuel. The production method comprises the following steps of collecting raw materials, batching, blending internal fuel, extruding, molding, drying, roasting and obtaining the products. The baked bricks in the invention have the advantages of energy conservation, heat preservation, superior performance and low cost, and can be widely used in wall body construction in building industry. The production method in the invention has advanced processing steps, economy, reasonability, high cost-performance ratio, and especially low energy consumption of the manufacturing process, thus conforming to the national requirements of environment protection and energy conservation and enabling riverslakes sludge to be in full resource utilization.

The invention relates to a housing of a large-scale liquefied natural gas storage tank and belongs to the housing of a ground liquefied natural gas storage tank, which comprises the tank wall, the tank top and the tank bottom, wherein the tank wall and the tank top are respectively constituted by inner and outer layers of steel plates and middle sandwich concrete layers, steel bars are sequentially welded in the concrete layer of the tank wall side by side along the vertical direction, and the steel bars are sequentially welded in the concrete layer of the tank top side by side along the circular arc direction. The housing of the large-scale liquefied natural gas storage tank is constituted by combining the inner and the outer layers of the steel with the middle concrete, thereby completely ensuring that the structure has good impermeability, avoiding protrusive anchor nodes on the outer surface, being smooth and tidy and being attractive in appearance.

Provided are a slant grouting control steel anchor pipe frame and a construction method thereof. A primary grouting body is poured to the peripheral space of a steel anchor pipe through a primary grouting pipe; after the primary grouting body is solidified, a secondary grouting body is poured to the outside through a secondary grouting hole in the steel anchor pipe wall in a compression mode, the secondary grouting body splits the primary grouting body through the secondary grouting hole and is diffused to a peripheral rock and earth mass and forms a mixed grouting body with the primary grouting body. A concrete beam is poured along a slope to wrap the top of the steel anchor pipe in the beam. The slant grouting control steel anchor pipe frame combines the advantages of an anchor rod frame and a grouting control technology, the steel anchor pipe is used as a protection measure and a secondary grouting channel, and by means of improvement of the strength of the peripheral rock and earth mass through the secondary grouting, a steel pipe and the peripheral rock and earth mass form a whole body to defend a slope together. A slant grouting control steel anchor pipe frame structure has the advantages of being advanced in technology, reasonable in economy, fast in construction and the like and is a novel slope reinforcing technology with good developing prospects.

The invention relates to a suspended support arch shell structure comprising a net shell, an arch, a stay bar, a radial pull rod and an annular pull cable. The arch is replaced by a part of rod members of the net shell, and the lower part of the net shell structure is provided with a vertical stay bar, the radial pull rod and the annular pull cable to form the suspended support arch shell structure. The net shell adopts a single layer of spherical net shell, a single layer of ellipse spherical shell, double layers of spherical net shell and double layers of ellipse spherical shell. The invention has the advantages of overcoming the defects of poor stability of the single layer of net shell or the double layers of net shell with thinner thickness and small spanning capability and the defects of difficult processing of horizontal push force of an arch springing support base of an arch structure by fully utilizing matured installation technology of the net shell, strong spanning capability of the arch structure and high intensity tension performance of a cable material, thereby a structure system with large spanning capability, favorable stability, reasonable economy and convenient construction is formed, and the invention is universally suitable for common industry and civil architecture, in particular to large-spanning space structure systems, such as convention centers, stadiums and the like.

The invention discloses a temperature gradient energy storage heat exchanger. The temperature gradient energy storage heat exchanger comprises a front clamping plate, a rear clamping plate and at least two sets of plates overlapped between the front clamping plate and the rear clamping plate to form fluid channels in a sealed mode in sequence. The four corners of the front clamping plate, the fourcorners of the rear clamping plate and the four corners of the plates are provided with circular fluid through holes correspondingly. The spaces inside the at least sets of the plates are filled withthe same phase change materials. The phase change temperatures of the phase change materials in the different sets of the plates decrease progressively in the fluid flowing direction. The temperaturegradient energy storage heat exchanger gives full play to the advantages of a plate heat exchanger such as high heat transfer coefficient, small occupied space, light weight and convenient manufacturing and achieves the purpose of improving the energy utilization efficiency through combination with the phase change materials with the characteristics of large heat storage capacity, environmental protection and selection diversity. The operational suitability is improved through independent cold and hot fluid channels. The temperature gradient energy storage heat exchanger has the advantages ofbeing large in energy storage density, convenient to operate and high in adaptability and can be applied to the fields of solar thermal collectors, heat pump heat collectors and industrial waste heatrecovery.

The invention relates to a method for building a tailings dam, in particular to a method for building a tailings dam through adoption of mine dumping. The method comprises the following steps that: a mine dumping yard and a tailings dam of a concentrating mill are combined; the mine dumping is adopted for directly building the tailings dam; a layered damming method or a strip damming method is implemented; after the tailings dam is formed, the inner side of the tailings dam is a tailings warehouse; and the outer side is a dumping yard. As mine dumping technology and damming technology of the tailings dam of the concentrating mill are combined, the method can greatly reduce the area occupation of the dumping yard, enlarge the utilization coefficient of the tailings warehouse and overcome the disadvantages of the prior damming construction method of the tailings warehouse and the difficult problems of sand lifting of tailings sand and the like; and meanwhile, after a mine stops production, under the condition that the mine dumping cannot be used for building the tailings dam, the concentrating mill can also utilize waste stone of the dumping yard to continue building the tailings dam. The process is suitable for the tailings warehouses of a valley type, mountain-surrounding type, flat type, cut-off river type and other types, is also suitable for building the tailings dam of the concentrating mill of other industries, is also suitable for newly building the tailings dam of the concentrating mill and is also suitable for building the tailings dam of the concentrating mill in course of production.

The invention discloses a correction and reinforcement method for a precast pile foundation of a high-rise building. The correction and reinforcement method for the precast pile foundation of the high-rise building comprises the steps that 1, the reason for settlement and inclination is analyzed; 2, a correction and reinforcement plan is made; 3, construction for reinforcement is conducted; and 4, construction for correction is conducted. The process for analyzing the reason for settlement and inclination comprises the steps that (1), settlement and inclination are monitored; (2), supplementary investigation is conducted; (3), the pile foundation is tested; and (4), the reason for settlement and inclination is analyzed. The process of making the correction and reinforcement plan comprises the steps that (1), the reinforcement and correction thought is determined; (2), a reinforcement and correction target is determined; (3), the characteristic value of the bearing capacity of an original single pile is determined; (4), a pile supplementing principle is determined; and (5), raft supplement is calculated. The process of conducting construction for reinforcement comprises the steps that (1), the foundation is dug; (2), an original soil body is compacted; (3), the position of a supplemented pile is determined; (4), a raft foundation is constructed; (5), column (wall) legs are reinforced; (6), a static pressure pile is constructed; (7), the quality is detected; and (8), pile sealing is conducted in a reinforcement area. The process of conducting construction for correction comprises the steps that (1), a limiting stopper is machined; (2), the limiting stopper is mounted; (3), seductive correction is conducted; (4), pile sealing is conducted in a seducing area; and (5), a seductive drilled portion is repaired, and correction and reinforcement are completed.

The invention relates to a treatment method of karst caves with different sizes and types applied to karst area cast-in-situ bored pile construction. Firstly, the depths and the heights of the karst caves at pile positions are obtained by adopting an advance drilling technology; treatment is conducted on non-filled karst caves and semi-filled karst caves with the cave heights being higher than 3 mby adopting a concrete pouring method; treatment is conducted on non-filled karst caves and semi-filled karst caves with the cave heights being between 1.5 m and 3 m by adopting a mortar pouring method; treatment is conducted on non-filled karst caves with the cave heights being between 0.5 m and 1.5 m and semi-filled karst caves with the cave heights being between 1 m and 1.5 m by adopting a screen pipe grouting method; and treatment is conducted on non-filled karst caves with the cave heights being lower than 0.5 m and semi-filled karst caves and full-filled karst caves with the cave heights being lower than 1 m by adopting a sleeve valve pipe grouting method. The karst cave treatment method can conduct treatment on the different types of karst caves well.

The invention relates to a process and equipment for flue gas roasting, adsorption desulfurization, dust removal and purification by adopting a combination process. Tar and dust in flue gas are gathered by a spraying tower having a cooling function and an electrical tar precipitator, and fluorine, SO2, NOX, dust and harmful substances, such as tar and dust which are not electrically gathered, in flue gas are adsorbed by using calcium hydroxide. The process disclosed by the invention has the advantages of simple process flow, small occupied area, low investment and low energy consumption; the equipment for comprehensive adsorption desulfurization, dust removal and purification by adopting a set of electric trapping dry process can be used for simultaneously removing multiple harmful substances from the flue gas, thoroughly purifying the flue gas at one step, and effectively overcoming the technical difficulty that multiple harmful substances in the flue gas cannot be removed until multiple sets of purification equipment are simultaneously used; the harmful substances in the flue gas can be removed at a distinct gradation and a high efficiency, and the emission concentration of the flue gas is superior to a national emission standard.

The invention discloses application and a remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation. Calcium polysulfide is adopted for chromium contamination remediation, and two remediation methods are particularly related. The method for remediating chromium-contaminated soil by calcium polysulfide comprises the following steps: investigating the chromium contamination degree of soil, preparing a calcium polysulfide water agent, determining the adding ratio of the calcium polysulfide water agent, adding the calcium polysulfide water agent, supplying water, carrying out remediation reaction, maintaining soil and adjusting the nature of the remediated soil. The method for remediating chromium-contaminated underground water by calcium polysulfide comprises the following steps: arranging injection points, determining the amount of a remediation agent, preparing the remediation agent, positioning the injection points, injecting the calcium polysulfide remediation agent, adjusting the positions and amounts of the injection points and the like. According to the invention, the operation process is simple; the agents are stable in source; the reaction speed is high; the remediation effect is good; the chromium-contaminated soil or underground water can be stable for a long time after remediation; the remediation method can be applied to large-scale implementation, is economic and reasonable, and is a relatively ideal chromium-contaminated soil or underground water remediation technique.

The invention discloses a ribbed prestressed pipe pile, and a manufacturing method and a drilling-planting construction process thereof. The ribbed prestressed pipe pile comprises an upper ribbed prestressed pipe pile and a plurality of lower ribbed prestressed pipe piles. The upper and lower ends of each lower ribbed prestressed pipe pile are provided with an external thread end plate and a closed end plate. Two ends of the upper ribbed prestressed pipe pile are provided with an external thread end plate and an internal thread end plate. According to the drilling-planting construction process, gravels are placed at the bottom of the pile and around the pile, grout is injected to the bottom of the pile and around the pile, and accordingly, limit bearing capacity of the single pile can be improved significantly and piles are saved. In addition, an injection pipe can be recycled after grout injection, so that fewer injection pipes are needed.

The invention discloses a recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification. The recycling device comprises a chemical decalcification system, a filter system, an electrolysis system, a membrane separation system and a desalting system, wherein the chemical decalcification system is equipped with a dosing system, and the membrane separation system is one of an ultrafiltration system and an MBR (Membrane Bio-Reactor) system. The recycling device combines a chemical decalcification technology, an electrochemical technology and a membrane technology, and 70-85% of the papermaking advanced treatment wastewater can be regenerated and recycled after treated, so that wastewater discharge is reduced; environmental pollution due to the wastewater is avoided; waste of a water resource is reduced; the cost of the regenerated circulating water can be lower than that of tap water; and the recycling device is economical and reasonable, generates better economic benefits, lowers a water consumption index and a wastewater discharge index per ton of paper greatly, and raises economic and technical indexes of an enterprise.

The invention provides a preparation method for a concrete silane paste impregnation waterproof agent, relates to a preparation method for an impregnation waterproof agent, and aims to solve the problems that the adhesion of existing liquid silane and silane emulsion is poor. The preparation method comprises the following steps: 1, weighing; 2, mixing to obtain a mixed solution; 3, performing initial reaction to obtain a reactant; 4, emulsifying to obtain the concrete silane paste impregnation waterproof agent. The preparation method has the advantages that the shortcoming of poor adhesion of liquid silane and silane emulsion is overcome, the construction is convenient, and multiple construction manners such as spraying, brushing and roll coating can be adopted for coating of vertical surfaces, so that the loss of active substances is reduced; the permeability of a pore structure of the material per se can be maintained; the waterproofness and permeability of the concrete silane paste impregnation waterproof agent are better than those of liquid silane and silane emulsion, the water absorption of a concrete structure can be reduced by 90% or above, the penetration depth of silane is increased, and silane can penetrate into the concrete surface at 3-4 mm. The method is mainly used for preparation of the concrete silane paste impregnation waterproof agent.

The invention discloses a reconstructed bearing layer control technology of large-deformation roadway surrounding rock. The method comprises the following steps of (1) performing the construction of a basic support system action zone of the roadway surrounding rock; (2) performing the construction of upper drill holes and lower drill holes in the lower portions of both sides of the roadway and enabling the horizontal depths of the upper drill holes and the lower drill holes to be lapped with the rock of elastic zones deep in both sides of the roadway; (3) laying a grouting liquid conveying system; (4) mounting upper grouting steel pipes, lower grouting steel pipes, supporting boards, fasteners and perforated seal plugs; (5) starting a grouting pump and enabling superfine cement grouting fluid or other grouting materials to be pressed around the upper drill holes and the lower drill holes in the lower portions of both sides of the road way and into the gaps between the basic support system action zone and a plastic (crack) zone of the surrounding rock through grouting hosepipes and the grout inlet holes and the liquid-flow holes of the grouting steel pipes; (6) when the grouting pressure and the grouting time both reach preset values, closing the grouting pump to stop grouting; (7) removing the grouting hosepipes and the perforated seal plugs from the external end portions of the upper grouting steel pipes and the lower grouting steel pipes and sealing up the grout inlet holes of the grouting steel pipes with solid seal plugs; and (8) performing the construction of an upper-lower reconstructed bearing layer zone on the lower portions of both sides of a next group of roadway in the same manner.

The harmless oil field mud and sand treating method and apparatus is used in treating various kinds of oily mud and sand produced in oil field production. The treating method includes pre-treating oily mud and sand into slurry, chemical pre-treatment, deposition treatment, oil-water separation treatment, and biological treatment to strip off and degrade raw oil in oily mud and sand with bacteria. The treating apparatus includes treating tank, automatic temperature controller, chemical adder, stirrer and aeration unit connected together. The present invention is simple and short in treating period and has no secondary pollution.

The invention discloses a fluoride-contained wastewater treatment method. Calcium hydroxide, sodium hydroxide and calcium chloride as well as sodium hydroxide and sodium chloride two-stage chemical precipitation reaction is adopted, meanwhile, PAM (Polyacrylamide) and PAC (Polyaluminum Chloride) flocculating settling is assisted, so that the fluorine concentration of effluent is greatly reduced; after fluoride-contained wastewater is treated by using the method, main pollution factors in the water are within the national normative standard range, and the fluorine ion content is reduced by about 3 times as comparison with the former fluorine ion content; the dosages of sodium hydroxide and calcium chloride and the wastewater treatment cost is greatly reduced. The invention also provides a fluoride-contained wastewater treatment device based on the treatment method. The fluoride-contained wastewater treatment method disclosed by the invention is simple and practical in process and capable of adapting to the changes of water quality and quantity and has a certain flexibility and adjustability; meanwhile, the treatment device is convenient to manage, operate and maintain.