166results about How to "Improve crack resistance" patented technology

The invention relates to a non-preheat welding method of high-strength steel whose tensile strength 800MPa, wherein it comprises (1), the connector has V-shape slope cut; (2), cleaning the slope before welding; (3), using impulse welding power source to weld in Ar+CO2 mixed gas or CO2 gas, while the welding voltage is 30-34V, the welding current is 200-240A, the welding speed is 0.4cm/s-0.6cm/s, the welding heat input is 10kJ/cm-20kJ/cm, and the protect gas flux is 15L/min-25L/min;(4), using 600MPa or 700MPa drug welding or solid welding wire to weld bottom, while other welding channels use 800MPa drug welding wire to multilayer weld, without intermission; (5), using alumina silicate plate to cover the welding head, to cool. The invention can avoid preheat and following thermal treatment, with low cost, while the welding seam has high flexibility.

The invention discloses a welding wire and a method for applying the welding wire on aluminum and aluminum alloy to be welded with steel. The welding wire (3) takes Al-Si solder as matrix, and then alloying elements of Cu, Mn, Zn and microelements of B, Zr and La are added to form a dedicated welding wire. The method comprises the following steps: K-shaped divided edges are formed on both ends of the aluminum and aluminum alloy (5); the angle of the divided edges is 50 plus or minus 5DEG C; a divided edge of 30 plus or minus 5 and a truncated edge of 1.0-2.0mm are formed on the side of a steel piece (4); the steel piece (4) is fixed on a chucking tool with a cooling device; the butt clearance between the aluminum and aluminum alloy (5) and the steel piece (4) is 1.0-2.0mm; a small-scaled pulse AC TIG welding method is adopted for single-side welding to realize double side shaping; a tungsten electrode (2) is hemispherical; the nozzle (1) of a welding gun is inclined to the aluminum side; and the welding wire (3) is continuously fed. The method can successfully realize the effective and fine quality connection of the aluminum and the dissimilar steel material by electric arc braze welding without clad layer, and has the advantages of simple operation, low welding cost, and stable and reliable welding process.

The invention discloses an elastic epoxy resin waterproof coating which comprises components A and B, wherein the component A comprises the following components in parts by weight: 65-85 parts of epoxy resin, 5-10 parts of activity diluent, 5-10 parts of reaction type plasticizer, 5-20 parts of functional additive and 280-500 parts of functional filling agent; the component B comprises the following components in parts by weight: 20-30 parts of modified amine hardener, 1-2 parts of coupling agent and 1-2 parts of prompting agent. The waterproof coating disclosed by the invention can be directly firmly adhered to the surface of a cement substrate when used on the surface of concrete, and 20% of deformation, cracking and the like on the surface of the cement substrate is overcome.

The invention relates to the field of metal welding materials, especially a high-efficiency flux-cored wire for master cable energy forced shaping, and a preparation and application method thereof. The flux-cored wire comprises an outer steel belt sheath and a filling and welding flux, wherein the filling and welding flux is prepared from the following components in percentage by mass: 0.03-0.06% of C, 0.25-0.70% of Si, 1.3-2.0% of Mn, 0.1-0.7% of Ni, 0.1-0.4% of Mo, 0.01-0.1% of Ti, 0.003-0.01% of B, 0.01-1.1% of Mg, at most 0.1% of Al, 5-10% of slag former, and the balance of Fe and inevitable impurities; and the filling and welding flux in the flux-cored wire accounts for 15-25% of the total mass of the flux-cored wire. The flux-cored wire has the advantages of strong adaptability, wide range of adoptable welding technology, adjustable composition, high melting rate, smooth welding process, less dust, favorable slag detachability, favorable flowability and fewer generated bubbles; and due to the reasonable addition of iron powder, the flux-cored wire enhances the welding deposition efficiency, ensures the low-temperature toughness of the welding seam, and obtains excellent comprehensive mechanical properties.

The invention relates to anti-crack concrete for a wharf surface layer and a preparation method for the anti-crack concrete for the wharf surface layer. The raw material of the anti-crack concrete for the wharf surface layer comprises the following components in weight ratio: 300-360kg/m<3> of binding material, 670-760kg/m<3> of fine aggregate, 1120-1210kg/m<3> of coarse aggregate, 3-5kg/m<3> of water reducing agent, 0.9-1.0kg/m<3> of polypropylene fibre and 145-165kg/m<3> of water. The anti-crack concrete for the wharf surface layer is good in working performance, is wide in concrete crushing strength (C25-C40) and is higher in crack resistance; plastic shrinkage shows that no cracks are generated; the shrinkage is small after the concrete is dried for 80 days; 20-day splitting tensile strength and 90-day splitting tensile strength are higher. Concrete cracks of the wharf surface layer can be effectively controlled by adopting the anti-crack concrete and a proper construction process, and thereby, the appearance, the strength and the durability of the wharf surface layer are ensured.

The invention discloses a hydration heat suppression type expansion fiber composite anti-cracking agent, which comprises, by mass, 93.5%-98% of an expansion component, 1.5-6% of a hydration heat suppression component, and 0.5-1.5% of basalt fiber, wherein the expansion component is prepared by compounding a light burning magnesium-based expansion agent and a calcium-based expansion agent accordingto a mass ratio of 1:10-10:1, and the hydration heat suppression component is prepared by compounding an ester compound and a retarder according to a mass ratio of 1:1-5:1. The preparation method ofthe hydration heat suppression type expansion fiber composite anti-cracking agent comprises: pre-mixing the light burning magnesium-based expansion agent, the calcium-based expansion agent and the basalt fiber, adding the hydration heat suppression component, and completely mixing. According to the present invention, the prepared hydration heat suppression type expansion fiber composite anti-cracking agent can effectively reduce the temperature increase of the concrete hydration reaction, and can compensate the shrinkage from the early stage and the middle-late stages of the concrete so as tosignificantly reduce the temperature crack of the concrete and enhance the crack resistance of the concrete; and the preparation method is simple, can be widely applied, and has the production cost.

The invention discloses an ultra-high performance concrete material containing coarse aggregates and a preparation method of the ultra-high performance concrete material. The material is mainly prepared from cement, water, a water reducing agent, admixture, sand, the coarse aggregates and steel fibers. The ultra-high performance concrete material containing the coarse aggregates is prepared according to the following steps: firstly, weighing all the raw materials according to the proportions; secondly, adding the cement and the admixture into a mixer, uniformly stirring, then adding the sand and the coarse aggregates, and carrying out dry mixing to obtain a mortar mixture; thirdly, uniformly stirring part of water and all the water reducing agent in advance, then adding the mixture into the mortar mixture for stirring, and adding residual water to obtain mixed slurry; fourthly, spreading the steel fibers into the mixed slurry, and uniformly stirring to obtain the ultra-high performance concrete material containing the coarse aggregates. The ultra-high performance concrete material containing the coarse aggregates has the advantages of good flowing property, high strength, high elastic modulus, high bending resistance and excellent fatigue property.

The invention relates to a ''composite waterproof adhesive layer and a preparation method thereof'', and belongs to the technical field of road construction. The composite waterproof adhesive layer comprises the following three structural layers from bottom to top: a glass fiber geogrid layer, a rubber asphalt layer and a single grain diameter gravel layer; the glass fiber geogrid is formed by bidirectional warp knitting, the longitudinal and transverse tensile strength at break in each linear meter is not less than 25kN/m, and the longitudinal and transverse elongation at break is not more than 4 percent; the rubber asphalt is high-viscosity asphalt, and the spray value is 2.0 to 2.6kg/m<2>; and the grain diameter range of the single grain diameter gravel is 13.2 to 19 millimeters, the single grain diameter gravel exceeding the grain diameter range is not more than 10 percent, and the spread area is 60 to 85 percent. The composite waterproof adhesive layer has strong bonding capacity with an upper bearing layer or a lower bearing layer, can integrally improve the adhesion and the waterproof performance among pavement structure layers, and obviously improves the integral cracking resistance of the pavement structure.

A self-adjusting release bearing in the form of a tapered rolling bearing for a separating clutch disposed between an internal combustion engine and a gearbox of a motor vehicle, includes a non-rotating first bearing ring, a revolving second bearing ring, and a plurality of rolling elements guided between the first and second bearing rings. Supported upon a calotte-shaped section of one of the first and second bearing rings in a contact zone is an adjustment ring having a complementary calotte-shaped section to thereby allow pivoting of the release bearing, whereby a sliding element made of thermoplastic material is disposed in the contact zone.

Provided are an antifouling coating composition containing a hydrolyzable resin having a specific silicon-containing group and a triorganosilyl oxycarbonyl group, an antifouling film, a composite film and an in-water structure such as a ship using the same. The hydrolyzable resin may further have a specific metal-atom-containing group containing a divalent metal atom. By the antifouling coating composition, it is possible to form a coating film having excellent crack resistance, while exerting an excellent antifouling property for a long period of time even when no or a small amount of antifouling agent is contained.

The invention discloses an important component of a crack-resistant insulated flame-retardant building material coating. The important component is characterized in that nanosilicon dioxide and a graphene microchip are added to an insulated flame-retardant coating, wherein the nanosilicon dioxide accounts for 1%-5% of the weight of basic components of the insulated flame-retardant coating; the graphene microchip accounts for 0.5%-5% of the weight of the basic components; the crack resistance of the coating is improved by adding two inorganic non-metallic materials, namely the nanosilicon dioxide and the graphene microchip; crystal is grown and generated from the graphene microchip in a three-dimensional cellular way (same as a diamond mine); four valence electrons of each carbon atom form covalent bonds to be bound, cannot form electron flow in directional movement, and cannot conduct electricity; generated graphite carbon crystal is ground in a single direction in a wet nano-grinding manner, so as to generate the graphene microchip of which the thickness is in a nanometer scale and the area is in a micron scale; due to the addition of the graphene microchip into the coating, the fusion performance of the coating can be greatly improved; and the coating has good crack resistance.

High-flexibility leakage-resistant waterproof mortar is prepared from component in weight ratio as follows: 300-500 parts of cement, 100-300 parts of sawdust, 0.5-4 parts of a water-retaining thickener, 5-30 parts of polymer powder, 20-40 parts of bentonite, 0.2-2 parts of a rheological agent, 5-30 parts of an active compound, 1-3 parts of a water repellent, 30-60 parts of ultrafine powder, 0.5-2 parts of an early strength agent and 300-500 parts of sand. A continuous closed polymer film can be formed in the prepared mortar, and the active compound in the mortar can be crystalized and expanded to block capillary channels, so that the mortar has the characteristics of high binding strength, good flexibility, high strength, good leakage resistance, simple preparation process and low cost, can be applied widely to waterproofing and damp proofing of basements, waterproofing of roofs and external walls of buildings, waterproofing of underground garages, integral waterproofing of water tanks and water towers and the like and has large market space and high practicability.

The invention discloses a composite anti-cracking agent for super-long mass concrete and a preparation method of the composite anti-cracking agent. The composite anti-cracking agent is prepared from the following raw materials: 60%-70% of an expansion component, 10%-20% of a hydration heat regulating component, 10%-20% of a composite admixture, 5%-10% of a water reducing component and 0.5%-1.0% of anti-cracking fibers. The expansion component is formed by mixing a calcium expansion component and a magnesium expansion component, and the composite admixture is prepared from the following raw materials: calcined diatomite, active zeolite powder and phosphorus slag powder. The hydration heat regulating and controlling component is prepared by modifying beta-cyclodextrin. The invention also provides a preparation method of the composite anti-cracking agent. The concrete shrinkage can be effectively compensated in the whole course, the concrete temperature rise rate is reduced, the concrete cracking risk is reduced, the impervious performance and durability of the concrete are improved, the influence on the setting time is small, and the later strength of the concrete is not influenced; and the composite anti-cracking agent is especially suitable for building engineering with high cracking risk, such as mass concrete, side wall and bottom plate concrete and high-strength concrete.

The invention discloses cement-based floor self-leveling mortar comprising the following components according to weight ratio: 35-45 parts of high alumina cement, 40-50 parts of Portland cement, 8-10 parts of quartz sand, 3-5 parts of talcum powder, 4-5 parts of anhydrous gypsum, 0.5-1.5 parts of redispersible whey powder, 0.65-1 part of casein, 0.5-1.2 parts of defoaming agent, 0.8-1 part of retarding and water reducing agent, 1.5-2.2 parts of hydroxypropyl methyl cellulose and 0.1-0.3 part of nanometer titanium dioxide. A small amount of nanometer titanium dioxide is added in the cement-basec floor self-leveling mortar disclosed by the invention to improve the crystallinity and accelerate the condensation rate. The redispersible whey powder can effectively improve the bending strength and crack resistance of the mortar and avoid the shrinkage and crack of the mortar. The quartz sand with low fineness modulus is selected to effectively improve the floor wearing resistance of the mortar. The surface of the cement-based floor self-leveling mortar disclosed by the invention is unlikely to crack and the condensation rate is high, so that the mortar is suitable for leveling a new floor and renovating an old floor.

The invention discloses composite thermal insulation mortar which solves the problem that the thermal insulation property of existing thermal insulation mortar is not good and achieves recycling of crop straws. The composite thermal insulation mortar is composed of, by weight, 70-80 parts of cement, 10-15 parts of coal ash, 5-20 parts of calcium hydroxide, 10-20 parts of rice straw fibers, 30-40 parts of glass beads, 0.5-0.8 part of cellulose ether, 0.1-0.2 part of starch ether, 0.01-0.05 part of air entraining agents, 1-4 parts of emulsion powder and 150-190 parts of water, wherein the cement, the coal ash and the calcium hydroxide account for 100 parts. According to the composite thermal insulation mortar, the crop straws are fully utilized and recycled; meanwhile, the rice straw fibers of agricultural waste and the coal ash of industrial waste can be utilized, and the composite thermal insulation mortar is environmentally friendly, low in energy consumption and capable of being widely applied to thermal insulation of internal walls and external walls of buildings.

The invention discloses a waterproof sealing system for a high-speed railway bridge deck in a severe cold area and a construction method of waterproof sealing system. The waterproof sealing system comprises a protecting wall outside cable duct waterproof system and a between-cable waterproof system and is characterized in that the protecting wall outside cable duct waterproof system comprises a waterproof coating layer and a fiber reinforced concrete protecting layer; the between-cable waterproof system comprises a waterproof coil layer and a fiber reinforced concrete protecting layer. The waterproof sealing system has the advantages that the waterproof coil and C40 fine-stone fiber reinforced concrete are composited to serve as the structure waterproof sealing layer, and the crack resistance and freezing resistance of the concrete are increased; a self-made paving machine is used to perform coil paving to guarantee coil adhering density and increase the effect; a vibration platform isused to perform deck ultrathin glass fiber waterproof concrete pouring, a drainage slope is formed in one step, and cracking after construction is prevented effectively.

A method for manufacturing the electric transmission line post without pull cable A high-strength antiwear composite wood-plastics board is composed of an artificial core board with two adhesive layers on its both surface, and two veneers adhered respectively onto said two adhesive layers. Said veneer is chosen from high-density plywood, polyhydroamine solution immersed paperboard, and PCC plate. Said adhesive is chosen from MVF adhesive, high-adhesion emulsion adhesive and universal adhesive. Proportionally mixing cement, water, sand, broken stone and steel fibers, binding a skeleton with reinforcing bars, loading the skeleton in a mould, pouring said mixture in said mould, closing the mould, centrifugal shaping at a gradually increased rotation speed, and ordinary-pressure steam curing. Its product has no cracking.

A sipe blade for forming a sipe with one end opened and the other end closed in a land portion on a tread surface of a tire includes a front-end portion that forms the closed end of the sipe and a connection-end portion that forms the open end of the sipe being connected to a rib that forms a groove. A first thickness of the front-end portion is larger than a second thickness of a thinnest portion. A third thickness of the connection-end portion is 3 mm or less and is the largest thickness in a portion between the front-end portion and the connection-end portion, and the ratio of the third thickness with respect to the second thickness; i.e., the third thickness/the second thickness is 1.2 to 3.0.

The invention belongs to the technical field of welding materials, and particularly relates to welding wire powder, flux-cored wire and preparation and application. The welding wire powder comprises,by mass, 15-18% of metal chromium, 3-5% of metal nickel, 6-8% of manganese metal, 0.6-1% of rare earth ferrosilicon, 2-4% of aluminum iron, 0.8%-1.5% of ferrotitanium, 25-28% of rutile, 1-2% of zirconsand, 6-9% of quartz, 3-5% of aluminum oxide, 3-5% of magnetite, 3-6% of potassium titanate, 1-2% of sodium fluoride, 3-4.5% of dehydrated potash feldspar, 0.15-0.3% of bismuth oxide, 0.5-1% of rareearth fluoride, and the balance iron powder. The invention further provides the flux-cored wire containing the powder. The flux-cored wire is good in welding process, small in splashing, good in spreading and fusing performance, stable in arc, easy to deslag, attractive in forming, and excellent in mechanical property.

The invention provides a solid golf ball having a core and a cover. The core is formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber contains polybutadiene, a styrene-butadiene rubber and, optionally, an isoprene rubber. The co-crosslinking agent is methacrylic acid, and the rubber composition includes a specific waste material in the form of a powder. The core deflection and the cover material are optimized. Utilizing a waste material in a solid golf ball conserves resources and thus is beneficial to the global environment. Even during prolonged use, the golf ball maintains its basic performance attributes (feel, flight, durability) at a high level.

The invention provides a prestressed composite superimposed large-diameter tube pile and a manufacturing method thereof. The tube pile is characterized in that tube sections adopt an ultra high performance fiber reinforced cementitious composite (UHPFRC) as a substrate; ultra high toughness cementitious composite (UHTCC) crack-control protective layers are arranged outside the UHPFRC; a steel plate hoop is arranged on the periphery of the top of the tube section at the top of the pile; a flange plate is arranged at the bottom end of the tube section at the bottom of the pile; spiral stirrups are arranged in tube walls and preserved ducts are arranged in the tube walls; the tube sections are spliced into a whole by tensioning longitudinal prestressed tendons passing through the preserved ducts; the preserved ducts are densely filled by injecting cement paste after the longitudinal prestressed tendons are tensioned; steel tube pile tips are connected with the flange plate of the tube section at the bottom of the pile by welding; and stiffening plates are arranged at the intersections of the steel tube pile tips and the flange plate. According to the invention, the ductility, impact toughness and durability of the tube pile are fully improved.

The invention discloses recycled concrete and a preparation method thereof. The recycled concrete comprises construction waste recycled coarse aggregate, stones, cement, a mineral admixture, an excitant, a water reducing agent, fibers and water, wherein the fibers comprise modified polypropylene fibers and plant fibers, and the modified polypropylene fiber modification process comprises the following steps: adding polypropylene fibers into an oxidant, mixing, soaking, washing to obtain a first intermediate product, adding the first intermediate product into a coating material, and uniformly mixing to obtain modified polypropylene fibers. The preparation method of the recycled concrete comprises: uniformly mixing a mineral admixture, cement and an excitant, adding water accounting for 1/3-1/2 of the total weight, and uniformly mixing to obtain a first intermediate product; uniformly mixing construction waste recycled coarse aggregate, the modified polypropylene fiber and plant fiber toobtain a second intermediate product; and uniformly mixing a water reducing agent, the first intermediate product, the second intermediate product, stones and the balance of water to obtain the recycled concrete. The anti-cracking performance of the recycled concrete is good.

The invention provides a coated electrode which can obtain a weld metal with excellent cracking resistance and low-temperature toughness in welding of a high-tensile steel with a yield strength of 690 MPa class or more, and which ensures good weldability in all position welding. A coating ratio of a coating flux is 25 to 45 % by mass. A steel core wire contains 0.06 % by mass or less of C relative to the total mass of the steel core wire. The coating flux contains, relative to the total mass of the coating flux, 14.7 to 22.4 % by mass of metal carbonate (in terms of CO2 ), 13.1 to 24.8 % by mass of CaF2, 0 to 8 % by mass of TiO2, 0 to 8 % by mass of ZrO2, 1.1 to 3.0 % by mass of SiO2, 0 to 0.8 % by mass of Al2O3, 0.01 to 0.05 % by mass of C, 2.5 to 6.0 % by mass of Si, 2.2 to 8.0 % by mass of Mn, 1.8 to 7.0 % by mass of Ni, and 0.2 to 3.7 % by mass of Cr + Mo, and the balance including Fe, alkali metal fluoride, alkali metal oxide, alkali-earth metal fluoride (except for CaF2), alkali-earth metal oxide, B, Al, and Mg, and inevitable impurities (P, S, V, Nb, Sn). The following formula is satisfied: D=8.42-0.18CO2+0.05CaF2+0.50TiO 2-1.36SiO2-4.36Al2O3+0.71ZrO2<=3.8.

The invention discloses a special compacting agent for anti-permeability and anti-cracking concrete, and belongs to the technical field of building materials. According to the compacting agent, calcium nitrate solution, chitosan liquid, a modifying addition agent, urea and bacillus pasteurii liquid are stirred and mixed, sodium sulfate solution is added, then stirred and mixed, cooling is conducted, glutaraldehyde solution is dropwisely added, then stirred and mixed, pH is adjusted, and filtering and drying are conducted to obtain modified microcapsules; 20-30 parts of modified sodium alginatesolution, 20-30 parts of calcium bicarbonate solution, 30-40 parts of basic phenolic resin, 20-30 parts of the modified microcapsules, 20-30 parts of gelatin solution, 8-10 parts of phospholipid and8-10 parts of plant essential oil, by weight, are placed in a mixing machine, and stirred and mixed at a speed of 300-500 r/min for 40-60 min to obtain the special compacting agent for the anti-permeability and anti-cracking concrete. The special compacting agent prepared by the above technical scheme has the advantages that the crack resistance, mechanical properties and anti-permeability performance of the concrete are significantly improved.

Provided is a resin composition which gives a cured product of a photocurable resin having excellent crack resistance even when formed into a thick film, and capable of maintaining a low coefficient of linear thermal expansion, low thermal weight loss, and a low cure shrinkage. This photosensitive silicone resin composition comprises (A) a silica particle-containing condensation reaction product and (B) a photopolymerization initiator, and is characterized in that the silica particle-containing condensation reaction product (A) is a condensation reaction product of a polysiloxane compound (a) comprising a hydrolytic condensation product of one or more silane compounds represented by the following general formula (1): R¹_n1SiX¹_4-n1 (wherein R¹, n1 and X¹ are defined in the claims) and/or the silane compound, and silica particles (b), and has a terminal structure Si—O—Y (wherein Y is defined in the claims) which satisfies the following formula (2): 0<[Si—O—SiR³₃]/([Si—O—R²]+[Si—O—SiR³₃])≦1 (wherein, R² and R³ are defined in the claims), and has a photopolymerizable functional group.

The invention relates to the technical field of a thermosetting composite, in particular to a preparation method for the thermosetting composite. The preparation method comprises the following steps: preparing a resin glue solution, an reinforcing material and a release agent; coating a mould with the obtained release agent; brushing the obtained resin glue solution on the release agent twice to form a glue coating layer, as well as laying the obtained reinforcing material on the glue coating layer, carrying out compression with a press roll, and pouring unsaturated polyester resin onto the surface of the reinforcing material to form a surface layer; coating the surface of the surface layer with cellophane, carrying out hot-pressure moulding, and then carrying out demoulding.

The invention provides a high-property concrete for preparing the panel of panel rock-fill dam, and relative preparation process, for overcoming the defect of prior concrete which volume is instable. The inventive concrete is made from gelatinizing material, skeleton material, water and additive, wherein the gelatinizing material consumption is 280-390Kg/m3 concrete, the additive is water reducer, which consumption is 0.7-3.5% of the gelatinizing material, the ratio between water and gel is 0.30-0.45. The preparation comprises that adds skeleton material (sand and stone), gelatinizing material (cement and coal ash), water reducer and water into a mixer in turn, and mixes for 90-120s, to prepare panel concrete which apparent density is 2400-2600Kg/m3. The high-property panel concrete prepared by the inventive formula and method has high volume stability, high crack resistance, barrier property, freezing resistance, corrosion resistance, and carbonation resistance.

The invention provides a special foam concrete for exterior wall external thermal insulation system engineering. The special foam concrete comprises the following components in parts by weight: 100 parts of a cementing material, 0-50 parts of an admixture, 2-10 parts of a high polymer, 0.5-2 parts of fiber, 2-10 parts of a foaming agent and 2-15 parts of an additive. According to the special foamconcrete provided by the invention, other components are introduced into the common foam concrete, so that the special foam concrete has the characteristics of good fluidity, crack resistance, light weight, good affinity with a thermal insulation material, high bonding strength, adjustable setting time, function of repairing defects of a base wall, and the like, and the special foam concrete is filled between the insulation board and the base wall to play the role of bonding and repairing.

The invention discloses a mounting method of a double-layer paper surface gypsum board ceiling. The mounting method mainly comprises the following steps: firstly, surveying and setting out; secondly, composing and dividing meshes; thirdly, mounting side keels; fourthly, mounting hanging bars; fifthly, mounting main keels; sixthly, mounting minor keels; seventhly, mounting a base-layer paper surface gypsum board; eighthly, mounting a surface-layer paper surface gypsum board; ninthly, dotting antirust paint, and repairing and sticking a special paper tape. According to the mounting method disclosed by the invention, by means of the mode, the firmness and the flatness of the double-layer paper surface gypsum board can be improved, and cracks are reduced.

The invention provides a method for filling a hinge joint of a fabricated prestressed hollow beam slab, and belongs to the technical field of bridge engineering. The method comprises the steps as follows: inserting a screw type blocking strip into a bottom gap of the hinge joint, wherein the top surface of the screw type blocking strip comprises two split parts, one part is lapped on the other part, the length of the lapping position is 3-5 cm, and rubber strips are arranged on wing plates on the two sides of the screw type blocking strip; filling the middle of the hinge joint with micro-expansion concrete; when the concrete of the hinge joint reaches enough age period, filling the top of the hinge joint with bituminous grout; and when the bituminous grout reaches the design performance, pouring a pavement layer on the top surface of the hollow beam slab. When the micro-expansion concrete is poured, the top surface of the screw type blocking strip is open, so that the space of a vertical column is communicated with that of the hinge joint and the screw type blocking strip is stabilized by the rubber strips on the wing plates and the self weight of the concrete of the hinge joint; and the middle of the hinge joint is filled with the micro-expansion concrete, so that the space of the hinge joint is closed for a long time and the problem of water seepage due to premature failure of the hinge joint is solved.