337results about How to "Good waterproof effect" patented technology

The invention relates to a maintenance method for shield equipment and discloses a method for replacing a tail brush in a shield tunnel through liquid nitrogen freezing. The method comprises the following processing steps: 1, preparation of construction; 2, construction of freezing holes; 3, installation of a freezing system and a temperature measuring system; 4, construction of liquid nitrogen freezing; 5, construction of sealing maintenance of a shield tail; 6, construction of formation sealing of the freezing holes; 7, construction of forced thawing; and 8, construction of propulsion of shield recovery. According to the invention, stratum is frozen through a liquid nitrogen freezing method to form a frozen curtain, so that the defect of indeterminacy of a traditional grouting method for carrying out the treatment of stratum consolidation and water sealing to bearing pressure permeable stratum can be avoided; and the method has the advantages of high strength, good uniformity, good water-resisting property and the like.

The invention relates to a construction method for applying polyurea to the old flexible waterproof roof for renovation transformation, which comprises the steps of: (1) base layer cleaning; (2) field maintenance; (3) primer brush application: adopting epoxy modified polyurethane type materials with the 100 percent solid content as primer to be directly coated and brushed on the base layer; (4) polyurea waterproof layer formation through polyurea spraying and coating on the primer surface, wherein the spraying and coating construction is completed by regions, the construction overlap edge is designed into 150 to 200mm, the secondary construction is carried out, the solvent cleaning is carried out before secondary polyurea spraying and coating at time intervals more than 6h, then, the primer is coated and brushed, the polyurea is then sprayed and coated, and the thickness of the polyurea waterproof layer is not lower than 1.5mm; and (5) facing formation through finish coat brush application within 6h after the polyurea spraying and coating: the finish coat adopts aliphatic polyurethane materials, and the facing thinness is not lower than 0.2mm. Roofs after renovation transformation by the construction method have the advantages that the waterproof effect is good, and in addition, the appearance is attractive.

The invention discloses a method for simulating soil slope instability induced by groundwater. The method is characterized by comprising the following steps: a, putting a physical model on a centrifugal machine; b, raising the height of an external water tank, opening a water outlet valve and a water inlet valve, carrying out water seepage into a soil layer according to the thickness of a saturated soil layer and completing the saturation process of a soil mass; c, closing the water inlet valve, reducing the height of the external water tank, improving the centrifugal acceleration to solidifyand disperse the internal pore water pressure of the physical model; d, after the solidification is finished, opening the water inlet valve, raising the height of the external water tank to the corresponding height according to the preset water level height of an internal water tank; obtaining different infiltration capacity of the water to the slope when the water in the internal water tank seepsinto the soil layer and stays at different heights, and observing the wetting front change and the slope deformation condition of the physical model. The method disclosed by the invention has the advantages that the height of the groundwater level can be accurately adjusted in real time and washing of water current to the slope body is prevented; in the whole test process, high operability, highreliability and good test effect are realized.

The invention discloses a handheld stable balancing device, comprising a tripod head assembly, a handle component and waterproof structures, wherein the tripod head assembly comprises a first rotating part, a second rotating part, a third rotating part and a fixed part which are sequentially connected, a rotating shaft of the first rotating part, a rotating shaft of the second rotating part and a rotating shaft of the third rotating part are respectively vertical to one another two by two, and the fixed part is connected with the first rotating part; the handle component is connected with the third rotating part and is electrically connected with the tripod head assembly; the waterproof structures are respectively arranged at the connecting parts of all the parts of the handheld stable balancing device. According to the handheld stable balancing device provided by the invention, a camera is fixed on the tripod head assembly, and a handle is electrically connected with the tripod head assembly, so that the tripod head assembly can be controlled to rotate at all angles by means of the handle, and the angle of the camera is further adjusted; furthermore, the waterproof structures are respectively arranged at the connecting parts of all the parts, so that the handheld stable balancing device has a better waterproof effect.

The invention belongs to the field of water-proofing agents and discloses a fluoroalkyl-modified composite organosilicon water-proofing agent and a preparing method and application thereof. The fluoroalkyl-modified composite organosilicon water-proofing agent is prepared from, by mass, 10-15% of short-carbon-chain alkyl siloxane, 10-15% of long-carbon-chain alkyl siloxane, 40-45% of fluoroalkyl siloxane, 2-3% of complex emulsifier, 2-5% of polyvinyl alcohol, 1-5% of silane coupling agent, 1-3% of aluminum sulfate and the balance water. Short-carbon-chain alkyl siloxane, long-carbon-chain alkyl siloxane and fluoroalkyl siloxane are adopted for being used together to form a composite system, and it is ensured that the water-proofing agent has a good waterproof property and has excellent permeability and weather resistance; the water-proofing agent is W / O / W type pasty, and capable of being widely applied to the waterproof fields of concrete, bricks, mortar and the like, and the antifouling fields of glass and the like, and stability of the water-proofing agent is effectively achieved.

The invention discloses a production method for a sealing gasket, which is characterized by comprising the following steps of: 1, according to a prescription, stirring graphite powder, rubber, reinforced fibres and an antiager in a stirrer, uniformly mixing, and then discharging; 2, adding an accelerant in the mixture after discharging, uniformly mixing, then placing the mixture in a mould, and tabletting at normal temperature; 3, adding a metal layer between two tablets to form a composite tablet, and performing rolling vulcanization on the composite tablet in a vulcanization machine having a vulcanization temperature which is controlled to be 165-200 DEG C, so as to obtain a semi-finished product; and 4, stamping the semi-finished product after vulcanization into the needed sealing gasket, namely, the finished product. Compared with the prior art, the production method disclosed by the invention has the advantages that the production process is simple, and the operation is safe and convenient; natural rubber is high in elasticity, so that the produced sealing gasket is good in elasticity and plasticity, and resistant to corrosion and wear; and the sealing gasket is not easy to age via the rolling vulcanization.

The invention relates to a preparation process of water swellable rubber which relates to the technical field of waterproof materials for concrete road and bridge building and is characterized rubbery being prepared by mixing, milling and vulcanizing natural rubber, a modified starch grafted acrylate copolymer and an additive, wherein raw materials are in the following parts by weight: 10-60 parts of natural rubber, 10-40 parts of modified starch grafted acrylate copolymer, 0.3-3 parts of sulfur, 1-2 parts of vulcanization accelerator, 1-5 parts of zinc oxide and 0.5-2 parts of stearic acid. The preparation process is simple and has unique principle; and a prepared product has better elasticity, strength and extensibility, particularly has water swelling property, higher swelling rate and good water preventing and stopping effects and simultaneously has corrosion resistance to organic solvents, such as acid, alkali, salt, oil and the like, superior aging resistant performance, no flow at high temperature, no embrittlement cracking at low temperature, long service life, convenient construction, lower cost, no toxicity, no pollution and wide application range.

The invention discloses a waterproof frame of a solar cell assembly. The waterproof frame has two types. One side of the waterproof frame and an outboard frame groove of the solar cell assembly are installed together cooperatively, and the other side of the waterproof frame and a roof structure are installed together. Besides, the two types of waterproof frames are formed by direct bending of thin iron sheets. According to the invention, the waterproof frame, which is used for connection between a photovoltaic cell assembly and a roof structure, has a good waterproof effect; besides, the frame is easy to manufacture and can be installed and replaced conveniently.

The invention discloses a rainy season wet soft roadbed filling construction method. The method comprises the following steps of S1, soil filling water content testing and quicklime doping amount design; S2, test section construction; S3, material preparation; S4, lower bearing layer treatment; S5, measurement and lofting; S6, paving; S7, mixing; S8, leveling and light pressing; S9, rolling; S10,maintenance; and S11, later inspection. According to the rainy season wet soft roadbed filling construction method, during the construction, the quality of the subgrade filling can be ensured, the phenomena of subgrade deformation, subgrade bed frost boiling and mud pouring can be reduced, the roadbed construction efficiency can be accelerated, the construction period and cost can be saved, and the construction quality and efficiency of rainy season roadbeds are guaranteed; and meanwhile, the roadbed filling quality is guaranteed, the roadbed filling construction progress is accelerated, the construction site personnel and machinery idling phenomenon is reduced, and the time for waiting for passing along the vehicles is reduced.

The invention discloses a steel cylinder pile or steel sheet pile with sealing grooves and occlusion structures. The steel cylinder pile or steel sheet pile is provided with the waterproof sealing grooves; at least one groove used for sealing is formed in the connecting positions of steel sheet piles or steel cylinder piles; the cross section of each groove is convex-arc-shaped, concave or polygonal; pipes with the same sectional area are inlaid in the grooves; the steel sheet piles or the steel cylinder piles and the pipes inside the grooves are rammed into a stratum together or separately; and after the steel pipes are pulled out, waterproof sealing materials are reserved in or injected into cavities inside the grooves so as to form waterproof sealing layers at the connecting positions of the steel sheet piles or the steel cylinder piles. The steel cylinder pile or steel sheet pile has the advantages that in the application of a steel structure continuous wall, a foundation and a foundation pit, particularly, the sealing structural steel cylinder pile is a rectangular steel cylinder pile, and rectangular steel cylinders are tightly arranged.

The invention discloses a soil moisture meter embedding device and embedding method. The device comprises a mounting cylinder, a ramming plate and an operation rod, which can be mounted on the mounting cylinder and can be also mounted on the ramming plate, wherein the operation rod is mounted right above the mounting cylinder so as to form a mounting device; and the operation rod is mounted right above the ramming plate so as to form a rammer; and the method comprises the following steps of: (1) drilling of an embedding hole; (2) water-proof treatment of a data wire joint; (3) mounting of a soil moisture meter: feeding the soil moisture meter to the bottom of the embedding hole by the mounting device and then inserting a probe into a detected soil body downward by using the operation rod; and (4) backfilling of the embedding hole: backfilling the embedding hole in a layered way; and after each layer is backfilled, ramming the backfilled soil body by the rammer. The soil moisture meter embedding device disclosed by the invention has the advantages of simple structure, simplicity and convenience in operation, good use effect and convenience in promotion and application; the soil moisture meter can be accurately mounted to the detected soil layer through drilling the hole; and the real moisture content variation situation of the detected soil layer can be accurately reflected by the soil moisture meter.

The invention relates to a freezing isolation and in-situ thermal desorption integrated system and a treatment method for contaminated soil. The system comprises a plurality of freezing wells uniformly distributed along the edge of a repairing area at equal intervals, a cooling system communicating with the cooling wells, heating wells located in the repairing region, a heating system communicating with the heating wells, extraction wells located in the repairing region and a suction system connected to a suction system; the space between two adjacent freezing wells is smaller than 1m and the distance between each of the heating wells and each of the freezing wells is greater than 2m; the cooling system comprises freezing circulating pipes put in the freezing wells and a frozen fluid injection system, the outlet of the frozen fluid injection system communicates with the freezing wells, and flow pressure gauges are arranged on the inner side and the outer side of each of the freezing wells; and the heating system heating pipes put in the heating wells and a hot steam injection system, and the outlet of the hot steam injection system communicates with the heating wells. By combining a freezing isolation barrier technology with a soil thermal desorption technology, the freezing isolation and in-situ thermal desorption integrated system for the contaminated soil is designed.

The invention belongs to the technical field of grain storage, and in particular relates to an underground bionic honeycomb granary and a grain storage method. The granary is designed through the reference and absorption of the original ecological honeycomb structure principle and comprises a granary body positioned below the ground surface, wherein the granary body consists of a plurality of rows of honeycomb silos among which gaps are formed in the transverse direction; each row of honeycomb silo comprises a plurality of silos which are tightly arranged along the longitudinal direction in turn; a silo upper opening is formed at the upper end of each silo and is provided with a closed cover; each silo comprises a reinforced concrete layer or a brick-concrete masonry layer; a polyethylenefilm layer is arranged in each silo; a spodosol layer is backfilled in an outer wall gap of each silo; and soil or sandstone or a soil and sandstone mixed material is backfilled among the spodosol layers. Grain is stored in the polyethylene film layers and isolated from outside, so that four ecological factors such as moisture, temperature, oxygen and light rays which can cause the deterioration of the stored grain are inhibited from the source, the stored grain is free from insects, mildew, rat damage, fires, floods and earthquakes, and the shelf life of the stored grain is prolonged by morethan one time.

The invention discloses a physical model for simulating soil slope instability induced by groundwater and belongs to the field of physical model tests. The physical model comprises a model case and ischaracterized by further comprising an external water tank and a lifter, wherein a base is fixedly arranged on the inner bottom wall of the model case; an impervious layer is fixedly arranged on thebase; a soil layer is arranged on the impervious layer; a pore-water pressure sensor, a soil pressure sensor and a differential displacement sensor are arranged in the soil layer; an internal water tank is arranged on one side of the base; water level scales are etched on one side wall of the internal water tank; a plurality of water seeping holes are formed in the other side wall of the internalwater tank; porous stones and geotechnical cloth are sequentially arranged between the water seeping holes and the soil layer; a stainless steel hose is connected to the internal water tank; a water flow sensor is fixedly arranged on the stainless steel flexible hose. According to the physical model disclosed by the invention, underground water level height can be accurately adjusted in real time;in addition, the infiltration capacity of a slope body at certain water level height can be maintained, scouring to a soil model can be effectively avoided, and a good test effect is realized.

The invention relates to a prefabricated pipe gallery and cast-in-place pipe gallery connection waterproof structure. The prefabricated pipe gallery and cast-in-place pipe gallery connection waterproof structure comprises a step type tongue-and-groove, low-modulus polyurethane sealants, copper plate water stop belts, a water collection box, a slip casting main pipe, slip casting guide pipes and slip casting holes. The upper portion of a prefabricated pipe gallery is provided with a top plate, the lower portion of the prefabricated pipe gallery is provided with a bottom plate, and the middle portion of the prefabricated pipe gallery is provided with a side wall. The side wall of the connection fracture surface of the prefabricated pipe gallery and the cast-in-place pipe gallery is providedwith the step type tongue-and-groove. The surfaces of the pipe galleries are provided with grooves, the slip casting main pipe is embedded into the grooves, the two ends of the slip casting main pipeare provided with the slip casting guide pipes, and pipe body of the slip casting main pipe is provided with the slip casting holes which are distributed at equal intervals. The end openings of the inner side and the outer side of a construction joint are provided with the low-modulus polyurethane sealants, and the construction joint is internally provided with the copper plate water stop belts. The prefabricated pipe gallery and cast-in-place pipe gallery connection waterproof structure and the construction method have the beneficial effects that the multi-waterproof structure is good in water isolation effect; the strength at the joint position is higher, and differential settlement is reduced; construction of the waterproof structure is easy, time and labor are saved, and the cost is low; and when the deformation joint leaks, double guarantees of rescuing and repairing are achieved.

The invention provides well-cementing waterproof gel which comprises, by weight parts, 0.5-1 part of crosslinking glue, 0.001-0.1 part of crosslinking agent, and the balance water. The crosslinking glue comprises xanthan gum. The crosslinking glue comprising the xanthan gum is taken as a raw material; and through an effect of the crosslinking agent, the obtained well-cementing waterproof gel is good in waterproof performance and has very good compatibility with cement paste. Experimental results indicate that the water filter loss of the well-cementing waterproof gel under the pressure of 3.5 MPa for 5 min is 0, and the well-cementing waterproof gel has no influence on densification time and strength of the cement paste after being mixed with the cement paste according to different proportions.

The invention discloses a waterproof down coat which comprises a coat body and coat liner. The coat body is provided with an outer layer made of high-density water-repellent fabric and an inner layer made of warp-weft high-density coated fabric. The down liner comprises 80-85% of white goose down and 15-20% of white duck down. The outer layer of the down coat is made of the high-density water-repellent fabric, so that the waterproof down coat is highly waterproof and breathable. In addition, the down liner is subjected to waterproofing coating, so that waterproofing is improved further. The waterproof down coat is resistant to damp-induced deformation even in rainy days, and using effect and wearing comfort are totally unaffected.

The invention discloses an embedded-module solar photovoltaic system. The system comprises a plurality of photovoltaic modules, wherein the photovoltaic module comprise photovoltaic components, longitudinal brackets and transverse brackets; the photovoltaic components are embedded in a grid consisting of the longitudinal brackets and the transverse brackets and are connected with the longitudinal brackets through self-tapping screws; longitudinal directions of the photovoltaic modules are connected with one another through a radial flow groove, and transverse directions of the photovoltaic modules are connected with one another through a pressure plate; the tail ends of the photovoltaic modules are sealed by an edge sealing plate; the photovoltaic components comprise solar cell panels and component frames; the upper surfaces of the component frames are partially provided with convex marks; one side of each component frame is provided with an extending oblique part on which a vertical eave is arranged, and the other side of each component frame is provided with a cavity and a groove; the solar cell panels are arranged in the groove; and the component frames are fastened by frame corner connector. The embedded-module solar photovoltaic system realizes modular installation, brings convenience to the maintenance and replacement of the photovoltaic components, has good water resisting effect, can replace a conventional building enclosing member and realize the integration of photovoltaic buildings.

The invention relates to a static pressure layering water intaking system which comprises a plurality of sections of water pumping pipes which are connected together; the lower ends of the water pumping pipes are connected with a water intaking device; the upper ports of the water pumping pipes are sealed by sealing pieces; the upper part of each water pumping pipe is provided with a water pumping device one end of which extends into the water pumping pipe after passing through the sealing piece. By using the sealed steel pipe, the preset water intaking depth can be reached at one time, and multilayer water intaking at different depth at a planar water intake position can be realized continually. The influences generated by being contacted with air and the human pollution on the obtained water sample can be avoided, so as to ensure the quality of the water sample, and the veracity of physics and chemical assaying for the water sample. The system of the invention is characterized in that the operation is convenient, the water intaking efficiency is high, the quality of the water sample is high, the cost is low and the water proof effect is good.

The invention belongs to the field of photovoltaic materials, and in particular to a doped perovskite solar cell and a method for preparing the same. The doped perovskite solar cell successively includes a FTO conductive glass substrate, a NiOx cavity transmission layer, a perovskite absorption layer, an electronic transmission layer, a buffering layer and a metal electrode layer which are successively laminated from bottom to top. The perovskite absorption layer is doped with MoS2 which has strong hydrophobic property and high charge transmission property, which can effectively increase the photoelectric property and stability of the solar cell. The doped perovskite solar cell has the characteristics of simple components, easy preparation, excellent repeatability, no hysteresis effects, and suitability for industrial production.

The invention discloses a new type material integrating decoration, waterproof and heat insulation and the preparation method, which is characterized in that: the new type material comprises a heat preservation and insulation layer; an anti-crack and protective waterproof layer is combined between the heat preservation and insulation layer and a decoration waterproof layer; the invention adopts the preparation steps that: the heat preservation and insulation layer is combined with the anti-crack and protective waterproof layer, and the anti-crack and protective waterproof layer is combined with the decoration waterproof layer. The invention has the advantages that: two waterproof layers and one heat insulation layer are provided; the first waterproof layer is made of one of the metal plate, polymerization cement mortar or the anti-crack and waterproof powder crack sealer; the decoration waterproof layer is coated on the metal plate, polymerization cement mortar or anti-crack and waterproof powder crack sealer, which forms the second waterproof layer; a color sand finish is formed by an external surface, integrating three functions of beautification and decoration, crack resistance and waterproof and heat insulation; the wall surface or the house surface has good waterproof, anti corrosive and anti-crack effects; the color sand facing is a flexible waterproof layer, and the house surface or the wall surface with high strength is wholly crack resistant.

The invention discloses an electrode boiler heating electrode rod device which comprises a conductive rod and an insulating sleeve. The conductive rod is arranged in the insulating sleeve, the electrode boiler heating electrode rod device also comprises an electrode head, the electrode head is a solid-core electrode head, and the electrode head is directly or indirectly fixedly connected with theconductive rod. The electrode boiler heating electrode rod device has the following beneficial effects that the solid-core electrode head is adopted as the electrode head, no space exists in the electrode head, no residual substance is accumulated in the electrode head, and stable operation parameters of an electric boiler during operation are guaranteed; and meanwhile, grooves are formed in the outer wall surface of the electrode head, so that the contact area between the electrode head and water is enlarged, the resistance between the electrode head and water is increased, the surface current of the electrode head is reduced, and the safety factor of the electrode head is increased.

The invention provides a home decoration toilet pipe-side floor drain treatment process. The treatment process comprises the steps of S1, digging out a groove in the concrete floor around the root of a pipeline, removing residue in the groove and cleaning the groove by use of water, S2, coating the groove with an interface waterproof agent once or twice under the condition of moist, S3, evenly mixing a multifunctional emulsion with quick-setting cement in the weight ratio of (0.3-0.5): 1 into a paste, applying the paste into the groove, and compacting and trowelling, S4, after the filler in the groove is solidified, coating the root and the four sides of the pipeline with a secondary pipe fixation waterproof glue. According to the home decoration toilet pipe-side floor drain treatment process, at least three waterproof layers, namely the interface waterproof agent layer, the mixed layer of the multifunctional emulsion and the quick-setting cement, and the waterproof layer of the pipe fixation waterproof glue are provided. Due to triple waterproofing operations, the waterproof effect is excellent and the service life is long.

The invention discloses a preparation method of an environment-friendly biodegradable PBAT foaming material, and belongs to the technical field of degradable foaming materials. The preparation method of the environment-friendly biodegradable PBAT foaming material comprises the following steps: putting 30-60 parts of a butylene adipate polymer and 10-40 parts of polylactic acid into a screw extruder I, adding 1-5 parts of organic modified montmorillonite, and melting to form a hot melt I with fluidity; putting 1-30 parts of a molecular chain modifier and 1-10 parts of a degradation agent into a screw extruder II, and melting to form a hot melt II with flowability; putting 5-10 parts of thermoplastic starch and 1-3 parts of plant fibers into a stirrer, and stirring; feeding the hot melt I, the hot melt II and the mixture into a screw reactor, and then adding 1-10 parts of a chain extender; the reaction melt discharged from the outlet of the screw reactor is pumped into a screw extruder III; according to the invention, the reduction of rigidity and heat resistance of the material caused by PBAT is compensated, and good water-proof and heat-insulation functions are maintained while the degradation capability is ensured.

The invention discloses a corrosion-resistant waterproof coating for environmental protection equipment and a preparation method of the corrosion-resistant waterproof coating. The coating is prepared from the components as follows: epoxy resin, polyvinyl alcohol, polyether polysiloxane copolymer, silane coupling agent, graphene, boron nitride, ultrafine mica powder, glass fibers, aluminium oxide, nano titanium dioxide, paste attapulgite, filler and anti-foaming agent. The preparation method comprises the following steps: firstly, carrying out reaction among the epoxy resin, the polyvinyl alcohol, the polyether polysiloxane copolymer and the graphene; then adding the boron nitride, the aluminium oxide, the nano titanium dioxide and the ultrafine mica powder which are ground; adding the silane coupling agent again to carry out reaction; mixing with the paste attapulgite, the filler, the glass fiber and the anti-foaming agent after the reaction is completed so as to obtain the coating; then spraying the coating on a surface of the environmental protection equipment. The coating has a preferable waterproof effect and also has preferable corrosion resistance performance and abrasion resistance performance; moreover, the service life of the equipment is prolonged, and the using cost of the equipment is reduced.

The invention discloses a laser cutting die processing method and particularly discloses a processing method for a laminated composite cutting die plate. The processing method comprises the steps of rotary cutting for obtaining a veneer, grinding the veneer in a beveled way, splicing the veneer in a beveled way, soaking the veneer, soaking a glass fiber cloth, drying, gluing onto PVC, assembling and thermally pressing, reconditioning and the like. Aiming at solving the problems of poor weather resistance, poor corrosion resistance, easy deformation at high temperature and the like existing in a wooden laser cutting die plate, a product obtained through the processing method disclosed by the invention comprises an upper surface layer and a lower surface layer which are both PVC thin layers, a secondary outer layer which is the bevel connection veneer, and other layers which are formed by laminating the glass fiber cloth and wooden layers in a staggered manner. The obtained product by adopting the method provided by the invention has the advantages of light weight, high strength, strong thermal stability, difficulty in deformation and the like and has significant economic benefit and market value.

The invention discloses a pond field experimentation device and a using method thereof and relates to a device for experimental study of pond water area ecology and a using method thereof. The problems that the water oxygenation effect is bad, the water inlet and drainage are inconvenient, fishes are difficult to escape and the requirements of experimental study of pond water area ecology cannot be met in the conventional field experimentation enclosure ecosystem are solved. The pond field experimentation device comprises waterproof cloth, a U-shaped pipe, an oxygenation aeration device, an anti-escape net, two filtering nets, two straight pipes, four upright rods and four transverse rods, wherein the four upright rods are arranged in an array; a cross rod is connected between two upright rods; and the four upright rods and four transverse rods form a square frame. The field enclosure experimentation method mainly comprises the following steps: 1, inserting the upright rods on the square frame into the bottom of the pond; 2, injecting water into the square frame with the waterproof cloth; 3, oxygenating and aerating in water; and 4, draining water in the square frame. The pond field experimentation device is used for research of pond water area ecology.

The invention discloses a mothproof waterproof magnesium oxide refractory slab. The refractory slab is prepared by mixing the following mixed raw materials in parts by weight: 72-98 parts of light calcined magnesia, 25-35 parts of magnesium chloride, 5-8 parts of perlite, 8-20 parts of wood bits, 4-8 parts of talcum powder, 1-8 parts of wollastonite powder, 1-10 parts of camphor, 0.1-1 parts of mothproof essential oil, and 2-5 parts of neoprene latex. The mothproof waterproof magnesium oxide refractory slab disclosed by the invention is quite good in halogen resistance, less in warping, deformation and cracking possibility, mothproof and quite long in service life.

The invention provides a cave type prefabricated assembly comprehensive pipe rack and a method for mounting the same. The cave type prefabricated assembly comprehensive pipe rack comprises arc-shapedroofs, partition plates, bottom plates and groove-shaped supports. The arc-shaped roofs, the partition plates, the bottom plates and the groove-shaped supports are prefabricated of waterproof concrete; free ends of the arc-shaped roofs are lapped in grooves formed in the tops of the corresponding partition plates and are fixed by the aid of waterproof concrete by means of pouring; the bottoms of the partition plates are inserted in the groove-shaped supports and are fixed by the aid of waterproof concrete by means of pouring; the groove-shaped supports are arranged at the upper ends of the bottom plates, and integral components are formed by the groove-shaped supports and the bottom plates; each pipe section is enclosed by the upper portion, two sides and the lower portion of an integral component which is formed by the corresponding arc-shaped roofs, the corresponding partition plates, the corresponding bottom plates and the corresponding groove-shaped supports, and the pipe sectionsare sequentially connected with one another to form a pipe rack. The cave type prefabricated assembly comprehensive pipe rack and the method have the advantages that the cave type prefabricated assembly comprehensive pipe rack can be conveniently prefabricated in factories and is convenient to transport; the cave type prefabricated assembly comprehensive pipe rack with the excellent integrity andstability can be excellent in performance in the aspects such as waterproof effects.