69results about How to "Will not cause collapse" patented technology

The invention provides an exploitation method and a system of seabed methane hydrate. The method comprises the steps that two silos which are different in depth and not far in distance are drilled by a drilling platform to a methane hydrate layer; two communicated cavities are formed by an explosive at the bottoms of the silos; high-temperature seawater is continuously injected into the bottom of the deeper silo, so that methane is converted into a gaseous state from a solid state; gaseous methane is ejected from the other silo, pressed, cooled, subjected to moisture removal, refrigerated by a nitrogen compressor to -162 DEG C to form liquid methane or made into methane hydrate again for storage; and a part of exploited methane serves as a fuel for heating the seawater. The method and the system have the benefits that methane hydrate stops decomposition as long as the high-temperature seawater is not injected; pipelines and container tanks have heat preservation measures, so that no heat energy is wasted; a diesel generator supplies power, so that the cost is low and the operation is reliable; the method belongs to a gap permeation displacement method and cannot cause seabed landslide; emissions are only carbon dioxide; and other wastes are wholly backfilled into a seabed, and are recycled.

The invention relates to a method of preparing multiporous SiO2 film by using polyvinyl alcohol (PVA) as template. It can singly use PVA with arbitrary a degree of polymerization to prepare multiporous SiO2 film, where the aperture size and distribution can be regulated by adding in two kinds of PVA with different degrees of polymeraiztion; the main process course: preparing PVA template solution, then mixing and stirring the PVA template solution with SiO2 sol, heating and synthesizing film precursor. The multiporous SiO2 film has the characters of reguable aperture, high porosity, large specific area, large thickness, and excellent thermal stability and has a wide use in high speed IC, catalysis, separation, heat insulation and preservation, subject and object chemistry, nano composite, etc.

The invention discloses a graphene-based aerogel material with a strong and tough structure and a preparation method thereof. Through introducing polymer nano-fibers and a PVA cross-linking agent in agraphene sheet layer, the graphene-based aerogel of a novel framework-beam column-adhesive three-dimensional channel structure is finally prepared; the polymer nano-fibers for supporting the graphenesheet layer are arranged in a three-dimensional channel in an oriented manner; the flexibility and the toughness of the polymer nano-fibers endow the graphene-based aerogel with excellent compressionresilience, so that tens of thousands of compression cycles can be borne, and the defect that pure graphene aerogel has a weak structure is effectively overcome. Moreover, the graphene-based aerogelnot only has good mechanical properties, but also maintains good electrical properties, therefore, the graphene-based aerogel can be applied to a high-sensitivity and fine pressure sensor and has relatively great application potential in the frontier fields such as artificial intelligence, wearable equipment and the like.

A nitric acid powder-acid liquid system for water injection well is composed of conventional well-flushing liquid, nitric acid powder solution and hydrochloric acid solution. Its acidifying process for unblocking the oil-bearing stratum by removing heavy oil and asphalt includes such steps as flushing well, sequentially injecting leading liquid, nitric acid powder solution, isolating liquid, hydrochloric acid solution and displacing liquid, closing well, reacting for 6-12 hr, and flushing well with aerated water.

The invention belongs to the technical field of silicon dioxide, and particularly relates to a preparation method of a silicon dioxide abrasive for high-density and high-dispersion toothpaste. According to the preparation method, with a sodium sulfate solution with the mass percent of 0.5-3.0% adopted as a reaction base solution, the silicon dioxide abrasive for the high-density and high-dispersion toothpaste is prepared by adopting a four-step method at 25-50 DEG C and 50-75 DEG C in sequence. The silicon dioxide abrasive for the high-density and high-dispersion toothpaste provided by the invention is large in density, small in pore diameter, high in dispersion, large in apparent density, low in oil absorption value and low in copper consumption, and can achieve good friction performancewithout damaging enamel and influencing the performance of a toothpaste body when being applied to a toothpaste formula. Besides, the preparation method of the silicon dioxide abrasive for the high-density and high-dispersion toothpaste is simple, easy to operate and controllable in condition; paste collapse cannot be caused when the silicon dioxide abrasive is applied to the preparation process of the toothpaste; liquid-phase components absorbed by the silicon dioxide abrasive are low, so that the production cost of the toothpaste is saved, and industrial production is easy to achieve.

The invention provides a preparation method of a lithium manganate battery. A positive electrode active material of the lithium manganate battery is spinel lithium manganate, and the chemical formulaof the spinel lithium manganate is LiMn1.Co0.25Al0.05O4; a negative electrode active substance is a graphite material; the preparation method comprises the following steps: putting a positive electrode and a lithium sheet into a first electrolyte, carrying out constant-current charging and discharging circulation for a plurality of times between a first preset voltage and a second preset voltage,and adjusting the voltage to be the first preset voltage; taking out the positive electrode, assembling the positive electrode and the negative electrode into a battery, putting the battery into a shell, injecting a second electrolyte, carrying out constant-current charging to a third predetermined voltage, and carrying out constant-voltage charging at the third predetermined voltage; and carryingout constant-current charging to a charging cut-off voltage, carrying out constant-voltage charging at the charging cut-off voltage, and circulating between the charging cut-off voltage and a discharging cut-off voltage for a plurality of times to obtain the lithium manganate battery. The lithium manganate battery obtained by the method disclosed by the invention has relatively high storage performance, and the battery can be stored for a relatively long time from delivery to use, so that effective capacity attenuation does not occur.

The invention relates to a continuous posthydrolysis method for polyacrylamide. The continuous posthydrolysis method comprises the following steps: homopolymerizing aqueous solution of the acrylamide to obtain high molecular weight polyacrylamide gel blocks; after one-time granulation, adding a dispersing agent I accounting for 1-1.5 percent of the total weight of the gel blocks during passing through a double-ribbon hydrolyzer and uniformly mixing; then adding alkaline as a hydrolytic agent and uniformly mixing the alkaline and colloidal particles; after uniformly mixing, adding a dispersing agent II accounting for 0.8-1.2 percent of the total weight of the gel blocks and uniformly dispersing; finally, enabling the mixture to enter a hydrolysis tank for hydrolysis; besides, keeping the hydrolysis tank at a certain material level for avoiding the influence on continuous operation of the granulation on the next station. With the addition of the dispersing agent I, the colloidal particles are prevented from being easily bonded and aggregated; the dispersion is uniform, so that the resistance for uniform mixing of the colloid and the hydrolytic agent is reduced, and the uniform mixing time of the colloid and the hydrolytic agent is shortened; with the addition of the dispersing agent II, the colloid and the hydrolytic agent can be mixed more sufficiently, and a hydrolysis reaction is realized more thoroughly. The amount of residual monomers and the content of water insoluble matters are effectively reduced, the molecular weight and the solubility of products are improved, and the viscosity of the products is improved.

The invention relates to a method for preparing an aerogel composite thermal insulation felt through normal pressure drying. The specific steps comprise: uniformly mixing a silicon source and deionized water to obtain a silicon-containing solution, uniformly mixing the silicon-containing solution, ethanol and an acidic catalyst, and stirring to obtain a sol; placing a composite material in a container, injecting the sol into the container loaded with the composite material, heating, and carrying out thermal insulation so as to wait gelation; placing the gel composite body obtained after the gelation into an acid alcoholization solution obtained by mixing anhydrous ethanol and sulfuric acid, heating, and carrying out thermal insulation; placing the gel composite body into a modified solution obtained by mixing a hydrophobic modifier and a solvent; and carrying out normal pressure drying on the modified gel composite body to obtain the aerogel composite thermal insulation felt material.According to the present invention, the technical scheme has advantages of low cost, less steps, less gel impurities, less energy consumption, simple equipment operation, and simple equipment maintenance.

The invention belongs to the technical field of food processing equipment and particularly relates to a cake dicing device. The cake dicing device comprises a rack, wherein a working platform is arranged at the top of the rack; a tray for placing cake is arranged on the working platform; a blade mounting seat is arranged above the tray; a blade for cutting cake is mounted on the blade mounting seat; a rotatable first drive mechanism capable of driving the tray to move back and forth is arranged at the bottom of the tray; a second drive mechanism capable of driving the blade to move up and down is arranged on the blade mounting seat; the cake dicing device also comprises a controller; and the first drive mechanism and the second drive mechanism are both electrically connected with the controller. According to the invention, the collapse and damage of cake are avoided, and the cut surface is neat and complete; and the tray can automatically do back-forth motion and rotation motion to finish the rotation and positioning of any angle, labor is not involved, the cutting efficiency is high, and the cutting size and shape are consistent.

The invention discloses a sticky microstructure AGM (Absorbed Glass Mat) clapboard. In the AGM clapboard, binder particles exist on the overlap joints of glass fibers. The weight percentage of the glass fibers is 90-99 percent, wherein the weight percentage of small-diameter glass fibers of which the diameters are 0.5-1.2 microns is 65-100 percent, and the weight percentage of large-diameter glass fibers of which the diameters are 3-10 microns is 0-35 percent. The binder particles consist of polyethylene viscose, polypropylene viscose and polyester viscose, and account for 1-10 percent of the AGM clapboard, and the particle sizes are 2-15 microns. The fracture strength of two fibers bonded by the binder particles is 2,000-5,000MPa. The clapboard is stable in structure, and can endure long-term acid soaking and mechanical vibration. The mechanical strength and chemical stability of the clapboard are enhanced, and the service life of a storage battery is prolonged.

The invention provides a method and system for exploiting land combustible ice. Two vertical shafts with different depths and not far from each other are drilled to a combustible ice layer through a drilling machine. Two communicated cavities are formed in the bottoms of the vertical shafts through explosion of explosive, high-temperature fresh water is continuously injected into the bottom of the deeper vertical shaft, so that solid methane is converted into methane gas, the methane gas is ejected from the other vertical shaft, pressurization and cooling are conducted so that moisture can be removed, refrigeration is conducted on the methane gas through a nitrogen compressor until the temperature of the methane gas reaches minus 162 DEG C, so that methane liquid is obtained or the methane gas is converted into the combustible ice again for storage, and part of the exploited methane serves as fuel for heating the fresh water. The method and system for exploiting the land combustible ice have the advantages that as long as injection of the high-temperature fresh water stops, resolving of the combustible ice stops, and an insulation measure of a pipeline and a container is achieved, so that waste of heat energy is avoided; electric power is supplied by a diesel generator, so that manufacturing cost is low and operation is reliable; the method belongs to a gap permeation substitution method, and therefore underground collapse is avoided; only carbon dioxide is contained in the emission and all the other waste is backfilled underground for reuse.

The invention relates to a boring method of geology whose upper portion is a silt layer and lower portion is a moderately weathered and a slightly weathered silt strata, which relates to a construction method of pile foundation boring. The invention aims to solve the problems that prior geology whose upper portion is a silt layer and lower portion is a moderately weathered silt strata or a slightly weathered silt strata uses an electric impact drill to impact to form holes, the boring speed is slow, the efficiency is low, the construction is not done using an auger drill, mud which is used when auger construction is prepared by bentonite or clay, the manhole mud concentration is 1.15-1.25, the manhole mud viscosity is 18-24S, and the moderately weathered and the slightly weathered silt strata which are arranged on the lower portion of the pile foundation is punched by the electric impact drill. Compared with the electric impact drill is solely used to punch, the boring method has faster speed, the upper portion 40mm geology of a pile hole whose length is 50mm and diameter is 1.25m is a silt layer, the lower portion is the moderately weathered and the slightly weathered silt strata, and the boring time is only 4-5 days. Compared with the prior art, the cost of the pile hole is capable of being reduced by 50 percent.

The invention provides a cell pole piece and a lithium ion battery cell. The cell pole piece comprises a current collector and active material layers, wherein a plurality of through holes are formed in the current collector; the interior of each through hole is coated with a conductive polymer material layer; a front surface and a back surface of the current collector are coated with the active material layers; the lithium-ion battery cell comprises a positive cell pole piece, a negative cell pole piece and an isolation membrane which are wound together after lamination; the isolation membrane is located between the positive cell pole piece and the negative cell pole piece. The through holes are formed in the cell pole piece so that the weight of the current collector can be reduced; interiors of the through holes are coated with the conductive polymer material layers so that an attachment basis can be provided for the active material layers, the coating effects of the active material layers and the current collector are relatively better, the active material layers on the through holes do not collapse, the structure is stable, and the energy density is improved; the above lithium ion battery cell reduces the weight of the lithium ion battery cell and improves the energy density of the entire lithium ion battery cell.

The invention relates to a drill-buried type prefabricated pipe pile for an electric transmission line. The drill-buried type prefabricated pipe pile comprises an internal flow-guiding component, a flow-guiding steel pipe, a prefabricated miniature pipe pile, a grouting head, a grouting head top plate, a grouting hole, a grouting steel pipe, a grouting head bottom plate, reinforcing ribs, an open hole, a top plate, a pore, bolt holes, an external positioning nesting component, four fork feet, angle steel and mortar, the internal flow-guiding component and the external positioning nesting component are connected through the grouted mortar, the internal flow-guiding component comprises the flow-guiding steel pipe, the prefabricated miniature pipe pile and the grouting head, the reinforcing ribs are welded into the grouting steel pipe, the open hole is formed in the grouting steel pipe, the top plate is welded to the top of the flow-guiding steel pipe and provided with the pore, the bolt holes are formed in the four corners of the top plate, and the four fork feet are welded to the outer wall of the external positioning nesting component through the angle steel at equal distances. The drill-buried type prefabricated pipe pile has the advantages of small environmental influence, high construction efficiency, reliable quality and low cost, and is suitable for being used and promoted.

The invention relates to ecological net cages and a side slope retaining wall using the same. Each ecological net cages comprises cage body and infill in the cage body, wherein the infill is formed by stacking a plurality of ecological bags layer by layer and has a plurality of outer edge wall faces which lean against the bottom faces, top faces and side faces of grid wall faces correspondingly; the bag bodies of the ecological bags in adjacent layers are fixedly connected by a reinforcing layer, so that the ecological bags form a whole, the strength of the whole is improved obviously and the tensile performance of the whole is improved; the outer edge wall faces formed by the infill can be tightly jointed with the grid wall faces of the cage body for making the side edges flat without any dents, so that the wall can be stacked conveniently and the fixed connection layers between adjacent net cages are more uniform and the entire retaining wall is more stable, particularly the infill still retains a whole when the cage bodies are damaged; and thus, collapse is prevented and the service life of the retaining wall is prolonged effectively.

The invention discloses a combined house. The combined house comprises a plurality of frames assembled through location fixture blocks, wherein the frames on the upper and lower adjacent layers are arranged in a crisscross manner; both the frame and the location fixture block are made of reinforced concrete; the cross section of the upper segment of the location fixture block is larger than that of the lower segment; the frame has a rectangular shape and includes a top plate and a bottom plate; a first location hole matched with the lower segment of the location fixture block in shape is formed on the top plate of the frame; a second location hole matched with the upper segment of the location fixture block in shape is formed on the bottom plate of the frame; the frames on the upper and lower adjacent layers are fixedly connected through the first location hole on the top plate on the lower frame and the second location hole on the bottom plate on the upper frame; and a waterproof sealant is applied between the location fixture block and the frame and between any two frames. The combined house has good seismic performance, and can prevent the buildings from collapsing due to earthquake or external collision. In addition, the combined house provided by the invention is detachable and movable, and can be recycled.

The invention discloses a solid distillation method for making wine, belongs to the technical field of wine making, also discloses a solid distillation device for the solid distillation method and provides a solid distillation method for making wine. According to the method, the filling speed of fermented grains is high, and the fermented grains do not generate a great amount of heated collapse in the distillation process to cause influence on the yield and the quality of made wine. Meanwhile, the invention also provides the solid distillation device for the solid distillation method. According to the solid distillation method, when the fermented grains are filled from bottom to top in a layer-by-layer manner, all the layers of fermented grains are separated by a supporting structure which is arranged in a retort barrel and is provided with ventilating holes, and are mutually independent by the supporting structure; the solid distillation device comprises the retort barrel with a hole bottom plate at the bottom and also comprises at least one set of supporting structure with the ventilating holes, wherein all the supporting structures are respectively arranged above the hole bottom plate in the retort barrel in sequence.

The invention discloses a method for drainage of a long-distance tunnel through a horizontal directional drill. The method comprises the steps that: first, a first water-retaining wall is arranged close to the tunnel face of a flat guide outlet section, the lower part of the first water-retaining wall is not sealed and then forms a water outlet, surrounding rock is reinforced through anchor rods,a second water-retaining wall and a third water-retaining wall are arranged, drainage ditches are formed in the left side and the right side of a tunnel section between the first water-retaining walland the second water-retaining wall, and the left side and the right side of a transverse cave, and a drainage channel connected with a natural river ditch is constructed in an outlet of the transverse cave; second, site survey, site layout, guiding line design, and surveying and setting out are conducted; third, a drilling rig is in place and conducts test drilling; fourth, the drilling rig drills; and fifth, site clearing and recovery are quickly conducted. The method is special for quick drainage of special tunnels not suitable for drainage, wherein the tunnels are not penetrated, the length of a to-be-excavated section reaches 800 m or above, the daily water inflow is large, and residential areas or factories are located below outlets of the tunnels.

The invention discloses a hydraulic pressure-type cable tunnel cleaning device, and relates to the technical field of cable casting construction tools. The hydraulic pressure-type cable tunnel cleaning device comprises a conveying device, a water spraying device, a hard flared tube, a soft mud tube, a water pump and a driving motor; the conveying device consists of a conical cover, a conical spiral conveying sheet and a transmission shaft; the conical cover is fixedly arranged on the left end of the transmission shaft; the conical spiral conveying sheet is located behind the conical cover and is fixedly connected with the transmission shaft through support rods; the right part of the transmission shaft penetrates through the water spraying device and is in rotary hermetic match with the water spraying device; the left end of the water spraying device is a truncated cone-shaped water sprinkling cover; a cavity is arranged in the truncated cone-shaped water sprinkling cover; a soft shaft is coaxially arranged in a soft water inlet sleeve pipe; the output end on the left side of the soft shaft is connected with the right end of the transmission shaft; and the right end of the hard flared tube is in butt joint communication with the soft mud tube. The hydraulic pressure-type cable tunnel cleaning device is high in mud cleaning efficiency, small in work resistance and small in water consumption amount and can clean cleanly.

A blower has a load-carrying frame with a base plate. A fan with a fan guard is mounted on the carrier frame. The fan cover has an air inlet facing the base plate and being separated from the base plate. An air intake gap is formed between the bottom plate and the fan case. The internal combustion engine drives a fan so that working air is drawn in through the air intake and blown out through the blower duct. Provide a leaf guard to prevent leaves and debris from entering the fan guard and cover the air intake gap with the leaf guard. The leaf guards are made of coarsely porous foam to allow the entry of operating air unabated and to prevent leaves or other debris from adhering to the leaf guards.

The invention relates to a light steel structure assembly and decoration integration building which is characterized by comprising a basic disc system, a wall module system, a floor board system and aroofing system, wherein the basic disc system comprises a foundation, a water dispersion system and outdoor steps. The wall module system includes an outer wall body decorative board system, an internal wall decorative board system, a wall body steel structure system, a wall filling material, an outer wall decorative board pendant and an inner wall decorative board pendant, wherein the wall bodysteel structure system and the wall filling material are positioned between the outer wall body decorative board system and the internal wall decorative board system; the outer wall decorative board pendant is used for connecting the outer wall body decorative board system with the wall body steel structure system, and the inner wall decorative board pendant is used for connecting the internal wall decorative board system with the wall body steel structure system. Each system of the light steel structure assembly and decoration integration building can be manufactured in a factory and finallyassembled on the construction site, and the light steel structure assembly and decoration integration building is simple in structure and convenient to construct, can improve construction progress andis of a step connecting node structure suitable for industrial production.

The invention relates to a method for preparing an environmentally stable silicon dioxide porous membrane with ultra-low dielectric constant, and a process for carrying out surface hydrophobic modification treatment for an amorphous inorganic SiO2 porous membrane prepared by a wet chemical method. The amorphous inorganic SiO2 porous membrane prepared by using polyvinyl alcohol (PVA) as a template agent has the characteristics of proper porosity, high thermal stability, clear etched graphs, and good compatibility with a microelectronic process. The SiO2 porous membrane is subjected to hydroxyl removal modification treatment by adopting trimethyl chlorosilane, so the surface of the membrane has hydrophobic property, and the membrane displays the performance of ultra-low dielectric constant and has good stability for the environment.

The invention discloses a water drain structure of a deep-buried water-rich fractured zone long-distance tunnel. A water-retaining wall is arranged in the position close to a parallel adit outlet segment tunnel face, the lower portion of the first water-retaining wall is not sealed so that a water outlet can be formed, surrounding rock between the parallel adit outlet segment tunnel face and the first water-retaining wall is reinforced through anchor rods, a second water-retaining wall is arranged on the side, close to an outlet, of a transverse hole in a parallel adit, and a third water-retaining wall is arranged on the side, close to the outlet, of the transverse hole in a main hole; and drainage ditches are formed in the left and right sides of a tunnel segment between the first water-retaining wall and the second water-retaining wall and in the left and right sides of the transverse hole correspondingly, a drainage channel connected with a natural river is built in the outlet of the transverse hole, and water drain holes connecting an outlet segment with an excavated segment are drilled in a to-be-excavated segment of the parallel adit. The water drain structure is specially used for fast water draining of special tunnels with the length of non-through to-be-excavated segments reaching over 800 meters, wherein the daily water inflow is large, and resident areas or factorieswhere water drain is unfit are located below outlets.

An embodiment of the invention provides a preparation method of a rib titanium alloy hollow structural part. The method comprises the steps that an upper core plate, a lower core plate and ribs are designed, the space of the upper core plate, the lower core plate and the ribs is filled with BaCl2, after combined welding, the upper core plate, the lower core plate and the ribs are placed in the space of an upper panel and a lower panel, wherein the lower panel and the lower core plate are basically attached, and when diffusion connection between the core plates and the ribs is carried out, the upper core plate cannot collapse, and the ribs cannot be bent. Furthermore, in the superplastic forming process of the upper core plate, deformation is small, the height of the ribs can be adjusted to conveniently control the superplastic deformation amount of the upper core plate, and the circumstance that the core plates are broken due to the fact that forming limit is exceeded cannot occur, so that titanium alloy hollow structures with various heights can be formed as long as mold and equipment conditions are allowed.

The invention provides a method and system for exploiting seabed flammable ice. The method comprises the steps that two shafts are drilled through a drilling platform and reach a seabed flammable ice layer, the depths of the two shafts are different, the distance between the two shafts is small, two cavities are formed in the bottom of the shafts through explosives in an exploded mode, the two cavities are communicated, high-temperature sea water is constantly poured into the bottom of the deeper shaft, so that methane is changed into the gaseous state from the solid state, gaseous methane is jetted from the other shaft, moistures are eliminated through pressurization and cooling, the temperature is lowered to minus 162 DEG C in a refrigerating mode through a nitrogen compressor, so that liquid methane is formed, or the methane is made into flammable ice again to be stored, and part of methane is used as fuel for heating sea water. The method and system for exploiting the seabed flammable ice has the advantages that as long as pouring of the high-temperature sea water is stopped, the flammable ice can stop decomposition, insulation measures are applied to pipes and containing tanks, and therefore waste of heat energy cannot be generated; power is supplied by a diesel generator, the manufacturing cost is low, and operation is reliable; the method for exploiting the seabed flammable ice belongs to the gap permeation substitution method, and seabed collapse cannot be caused; emission only comprises carbon dioxide, and other waste is used for seabed backfilling and recycled.

The invention discloses a strontium-containing mesoporous bioglass-magnesium composite and a preparation method therefor and application of the composite. The composite consists of a magnesium matrixand strontium-containing mesoporous bioglass evenly distributed in the magnesium matrix. The preparation method for the strontium-containing mesoporous bioglass-magnesium composite comprises the stepsof firstly mixing an organic template with a raw material to obtain mixed gel, and then performing high-temperature calcination to obtain strontium-containing mesoporous bioglass microspheres; and after the mesoporous bioglass microspheres are mixed with magnesium powder, preparing the strontium-containing mesoporous bioglass-magnesium metal composite material by utilizing a selective laser melting technology. The composite obtained by the invention has excellent biological activity, can promote formation of a calcium-phosphorus protective layer on the surface to delay degradation of the magnesium matrix, and meanwhile, strontium ions are released in a sustained-and-controlled manner by utilizing highly ordered mesoporous structures of the mesoporous bioglass to achieve long-term bone-promoting effects to accelerate the bone healing process. The composite prepared by the invention is a very great potential bone tissue repair material.

The invention relates to a chassis system of a light steel structure assembly and decoration integrated building. The chassis system of the light steel structure assembly and decoration integrated building is characterized by comprising a foundation of the assembly and decoration integrated building, a water diffusion system of the assembly and decoration integrated building and outdoor stairs of the assembly and decoration integrated building. The foundation of the assembly and decoration integrated building, the marble water diffusion system of a fabricated villa and fabricated stairs all can be manufactured in a factory, and finally fabricated in the factory or in a construction site, are simple in structure, convenient in construction, can improve the construction schedule, and are suitable for industrialized production.

The invention provides an exploitation method and a system of land methane hydrate. The method comprises the steps that two silos different in depth and not far in distance are drilled by a drilling machine to a combustible ice layer; two communicated cavities are formed by an explosive at the bottoms of the silos; high-temperature fresh water is continuously injected into the bottom of the deeper silo to allow methane to be changed to a gas state from a solid state; gas state methane is sprayed out from the other silo, compressed and cooled for moisture removal, and refrigerated to -162 DEG C by a nitrogen compressor to become liquid methane or made into methane hydrate again to be stored; and a part of exploited methane serves as a fuel for heating the fresh water. The method and the system have the benefits that methane hydrate can stop decomposing once injection of the high-temperature fresh water is stopped; heat preservation measures are taken for pipelines and container tanks, so that no heat energy is wasted; a diesel generator supplies power, so that the manufacturing cost is low, and operation is reliable; the method belongs to a gap penetration displacement method, so that underground collapse cannot be caused; and carbon dioxide is the only emission, and other rejected materials are wholly backfilled to the underground and recycled.