265results about How to "Improve structural durability" patented technology

An LED tube light includes a glass tube, a base, a light emitting unit, and two lateral cover assemblies. The base has a length larger than the length of the glass tube, wherein two opposite end portions of the base are arranged out of a region defined by orthographically projecting from the glass tube to the base. The light emitting unit is fixed on the base and is used for emitting light, passing through the glass tube to illuminate. The two lateral cover assemblies are respectively covered around the two end portions of the glass tube, wherein the two lateral cover assemblies are respectively installed on the two end portions of the base for maintaining the relative position between the cover assemblies and the base.

The invention relates to a corrugated steel webplate combined box girder floor system for a cable-stayed bridge and a construction method thereof, and belongs to the technical field of bridge structures. The corrugated steel webplate combined box girder floor system comprises a precast concrete plank and a cast-in-place concrete seam, wherein the precast concrete plank is positioned on a steel box girder and is integrated with the steel box girder into a whole; the steel box girder is formed by welding a top flange steel plate, a corrugated steel webplate and a steel plate at the bottom of the box girder; a box girder baseplate stiffening rib and a diaphragm plate are welded in the steel box girder; the diaphragm plate comprises a top flange steel plate of the diaphragm plate and a steel webplate of the diaphragm plate; a toggle pin connecting piece is welded on the top flange steel plate and the top flange steel plate of the diaphragm plate; and a steel anchor pulling plate and a steel sleeve are welded on the top flange steel plate. The corrugated steel webplate combined box girder floor system simplifies the manufacturing process for the precast concrete plank, gives full play to the superior mechanical property of the corrugated steel webplate and the release action of the corrugated steel webplate on the creep effect of concrete shrinkage, improves the bearing capacity, stiffness and crack resistance of the structure, and improves the durability of the structure.

A method for continuous tone imaging on a mat product having a web material with a three dimensional open structure provides a mat product with a sufficiently clear image. Moreover, it is a specific aspect of the present method to provide a clear image on such a three dimensional structure without negatively affecting the characteristics of the web material having the three dimensional structure. More specifically, the present invention is directed to a method for imaging a flexible high loft matting material which can be used in providing a floor covering mat product. The present invention is also directed to the imaged mat product produced in accordance with this method.

The invention relates to a bridge composite beam structure, in particular to a corrugated steel ventral shield preflex composite beam and a construction method thereof. The corrugated steel ventral shield preflex composite beam consists of an I-shaped girder provided with a corrugated steel ventral shield, and reinforced concrete boards coated outside the margin plates of the upper and the lower wings of the I-shaped girder. The corrugated steel ventral shield preflex composite beam can be applied to urban interchange engineering and high-speed railway bridge engineering. As the rigidity of the longitudinal bridge direction of the corrugated steel ventral shield is very small, which can not absorb preflex force when preflexing the girder, the loss of prestress of the structure under shrinkage and creep effects can be reduced; the excellent shear resistance bearing capacity of the corrugated steel ventral shield avoids cracks of the ventral shield, and the durableness of the structure is good; moreover, the invention also provides the construction method of the corrugated steel ventral shield preflex composite beam.

The invention relates to a structure of a building member and a material, particularly relates to a high-strength reinforced and functionally-graded concrete beam and belongs to the technical field of building materials. The high-strength reinforced and functionally-graded concrete beam is mainly characterized in that common concrete and a high-toughness fiber-enhanced cement-based composite material are combined in a layering manner; the common concrete is adopted for the pressed area of the concrete beam; the high-toughness fiber-enhanced cement-based composite material is cast in a pulled area in the whole longitudinal-length range of the beam or the specific beam section; and interface-area treatment is adopted for a combined area of the common concrete and the high-toughness fiber-enhanced cement-based composite material. The high-strength reinforced and functionally-graded concrete beam has the advantages that uniform transition of the material system on performance is realized, discontinuous weak areas on the interface are eliminated, the bearing capability of the structure is effectively improved and the completeness and the stability of the whole structure are ensured.

The invention provides a production method of a matrix pit type two-way pre-tensioned prestressed concrete track plate. The pre-tensioned process is different from a traditional pre-tensioned method that prestressed reinforcements are required to be exposed in air to generate rust; fixed-length reinforcements are adopted, and are additionally provided with anchor plates at the ends, so that the prestressed reinforcements can be closed through a seal anchoring mode, and the structural durability of the track plate is improved. The track plate adopts a matrix pit type tensioned pit structure. The invention discloses key equipment for production, technical parameters of key technological tools and structural principles or technical requirements of the key equipment.

The invention relates to a composite anchoring structure on the guyed tower end of a cable-stayed bridge. A plurality of steel anchor boxes with end box chambers are overlapped, and cast concrete with reinforcing bars penetrating through pinholes is arranged on the end box chambers. The box chambers are arranged on both ends of a steel anchor box and share the same end plate, a faceplate is arranged correspondingly opposite to the end plate, the end plate and the faceplate are connected by lateral plates on both sides to form a box chamber structure, the lateral plates are provided with a plurality of pinholes, and through holes are arranged on the lower part of the faceplate so that guyed sleeves can penetrate through. The invention accelerates the construction speed of a bridge tower, is convenient to manufacture, and has favorable durability.

The invention discloses a locally uncombined suspension bridge steel-concrete combined bridge deck system and a construction method of the combined bridge deck system, and belongs to the technical field of bridge structures. The bridge deck system consists of concrete slabs, longitudinal steel beams, cross steel beams, air nozzles and toggle pin connectors; and a suspension bridge section steel-concrete combined bridge deck system is prefabricated in a factory. The prefabricated concrete slabs and section steel main beams form a whole through concrete wet joints and the toggle pin connectors. The prefabricated concrete slabs and cast-in-place concrete joints are only connected with the cross steel beams to form a whole through the toggle pin connectors, the longitudinal steel beams are not provided with the toggle pin connectors, and meanwhile, the toggle pin connectors are not arranged in a certain area of the ends of the cross steel beams at hoisting points. The problems of cracking, complex structures of toothed grooves at the slab ends of the prefabricated concrete slabs and the like due to the factors of temperature, contraction, creep and the like of the concrete slabs of the traditional suspension bridge combined bridge deck system are solved by adopting a locally uncombined technology on the premise of keeping the consumption of steel, the manufacturing process of the prefabricated slabs is simplified, the bearing capacity, the rigidity and the cracking resistance of the structure are improved, and the durability of the structure is improved.

The invention discloses a self-compacting mass concrete construction method. The self-compaction mass concrete constructing method includes the steps of preparing self-compacting concrete, transporting the self-compacting concrete, pouring the self-compacting concrete, conducting curing and temperature control on the self-compacting concrete, and the like. The self-compacting concrete is composed of cement, aggregate, coal ash, additives, silica fume and a compound type WK expansion fiber anti-crack agent. According to the self-compacting mass concrete construction method, proportioning of the self-compacting concrete and the construction process are improved, so that it is guaranteed that the concrete has high fluidity, high anti-separating performance, high gap passing capacity and high filling ability simultaneously, and the mechanical property and durability of a structure are improved.

The invention belongs to the technical field of Portland cements, and discloses a high-anticorrosion composite Portland cement and a production method thereof. The high-anticorrosion composite Portland cement is mainly comprises, by volume, 0.5-8% of a sub-nanometer cementing material, 20-35% of a high-fineness auxiliary cementing materials, 30-55% of a medium-fineness Portland cement clinker, 20-45% of a low-fineness auxiliary cementing material or an inert filler and 3-8% of gypsum. The composite Portland cement has a good compressive strength and a high corrosion resistance, for example, the 28 d compressive strength is 45-65 MPa, the sulfate corrosion resisting coefficient is 1.1-1.3, the seawater erosion resisting coefficient is 1.2-1.4, and the chloride ion diffusion coefficient is 0.4 * 10<-12> to 0.8 * 10<-12> m<2>/s. The composite Portland cement is applied to fields with high requirements of the corrosion resistance.

The invention discloses a corrugated steel web pre-flex assembled groove shape beam and a manufacturing method thereof. The assembled groove shape beam comprises a corrugated steel webs (1) located at two sides of the assembled groove shape beam, primary concrete bad plate (5) cast at the periphery of a lower flange steel plate (3), and a secondary concrete cast at the periphery of an upper flange steel plate (2) or connected with the upper flange steel plate (2) by a shear connecting piece (4), the upper parts of the corrugated steel webs (1) are connected with the upper flange steel plate (2), the lower parts of the corrugated steel webs (1) are connected with the lower flange steel plate (3), and the formed cross section is a groove shape structural beam. The assembled groove shape beam solves the problems of the complex stress condition of plate-beam joint position of common prestress concrete groove shape beam, the easy cracking of concrete, the complex structure of reinforcing bars of the plate-beam joint position and high construction difficulty, high requirements for construction technology and condition, the large occupied area of on-site casting construction, the long construction period, etc.

The invention belongs to the field of engineering structures, and particularly relates to a novel FRP (fiber reinforced plastic)-steel tube-epoxy resin-sea sand concrete compression member. The member is characterized in that an epoxy resin layer is coated on the inner surface of a steel tube, and the steel tube is internally filled with sea sand concrete; an FRP material layer is overwrapped on the outer surface of the steel tube; because the FRP material layer is overwrapped outside the steel tube, and the steel tube is prevented from being in direct contact with the external environment, so that the durability of the steel tube is improved obviously; meanwhile the epoxy resin layer is coated on the inner surface of the steel tube, so that the sea sand concrete and the steel tube are isolated, and the corrosion effect of chloride ions in sea sand on the steel tube is avoided; and the potential safety hazards of the sea sand concrete are reduced, and the application of the sea sand concrete is promoted. The member is applied to high-corrosion coastal and offshore areas and the like, bears the load mainly focused on axle load, and has favorable economical and environmental benefits.

The invention relates to a self-healing cement-based material containing bacterial spores and a preparation method thereof. The self-healing cement-based material consists of cement, water, calcium lactate and bacterial spores, wherein the mass ratio of the water to cement is 0.3-0.5, the mass of calcium lactate accounts for 1%- 5% of the mass of cement, 10<6>-10<9> spores are added into 1cm<3> of cement-based material. The preparation method comprises the steps of: inoculating alkali-resistant Bacillus, culturing to obtain strain solution having a high spore forming rate, heating the strain solution in a 80 DEG C water bath for 20min, centrifugally cleaning to obtain a spore suspension; weighing the required cement, proportionally weighing and adding calcium lactate, stirring until calcium lactate is evenly distributed in the cement; mixing the spores suspension which is used for replacing a part of mixing water with the rest water evenly in a shaking manner and pouring into the cement and calcium lactate, and stirring evenly, and pouring into a mold for forming.

The invention relates to a composite rubber particle pad for shock absorbing and noise reduction of a track. The composite rubber particle pad comprises a surface non-woven fabric layer 1, a bottom face non-woven fabric layer 2 and a composite rubber particle layer 3. The composite rubber particle layer 3 comprises a mixture which is composed of two parts of rubber particles which are produced by crushing of waste automobile tires and one part of a polyurethane adhesion agent, diameters of rubber particles are no more than 3mm, and the thickness of the composite rubber particle pad is within a range of 6mm-8mm. The invention also discloses a method for producing the composite rubber particle pad. The method comprises the steps of material preparation, material feeding, material sealing and the like. The invention further discloses a plate type ballastless track structure in which the composite rubber particle pad is arranged. The structure comprises a steel rail assembly, a track plate 5, a quick-setting motor layer 6, the composite rubber particle pad 7, a cement asphalt (CA) motor layer 8 and a base 9. The composite rubber particle pad has the advantages of being low in cost, convenient to manufacture and good in structure durability, and the manufacturing method has the advantages of being simple in process and capable of achieving quick production.

A preparing method of a viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates is disclosed. The viscosity modifying material is prepared by fully mixing fumed silica, calcium carbonate, low-viscosity hydroxyethyl cellulose, high-viscosity hydroxyethyl cellulose, a thixotropy modifier and water-soluble polymer rubber powder. The viscosity modifying material comprises 45-55% by mass of the fumed silica, 43-55% by mass of nanometer calcium carbonate, 0-0.5% by mass of the low-viscosity hydroxyethyl cellulose, 0-0.5% by mass of the high-viscosity hydroxyethyl cellulose, 0-2% by mass of the thixotropy modifier and 2-4% by mass of the water-soluble polymer rubber powder.

The invention relates to a building material and particularly relates to a liquid waterborne waterproof agent and a preparation method thereof. The liquid waterborne waterproof agent disclosed by the invention contains aluminum silicate, an expanding agent, aluminum sulfate, sodium hydroxide and water. The liquid waterborne waterproof agent disclosed by the invention has the advantages of no organic solvent, no toxicity, no pollution to the environment, favorable flame-retardant performance, compact crystallization, water resistance, hydrophobility and aging resistance, capabilities of greatly improving the durability of a concrete structure and improving the compression strength and low cost; and the liquid waterborne waterproof agent is more ideal waterborne waterproof coating.

The invention relates to a non-earthing composite structure for a waterproof pavement layer of a top plate for a road tunnel. The structure comprises the following structural layers from top to bottom: a rubber pitch protective layer, a waterproof layer, an epoxy resin priming coat and a cement concrete top plate. The invention provides a composite structure for a waterproof pavement layer of a top plate capable of efficiently resisting drying and watering cycle and impact load of the surface load. The composite structure for a waterproof pavement layer of a top plate has superior waterproof performance and capacity of resisting the impact load, greatly improves the integrity and effectiveness of the waterproof system of the road tunnel, enhances the structural durability and satisfies the waterproof requirement of the top plate of the road tunnel.

A reinforcing structure for a building and a reinforcing member used for the structure, where the structure has excellent anti-vibration characteristics and quake resistance. The reinforcing structure and member for a building are capable of reducing the deformation of structural members of the building caused by vibration and removing the deformation so that the original form is restored. A reinforcing member (1) is provided and fixed at a corner portion where structural members (11, 12) of a building intersect. The reinforcing member (1) is formed such that a first spring member (third leaf 33) and a second spring member (layered leaf (5)) are combined, and a damper (4) and a synthetic resin foam body (2a) are arranged in a space between the first and second spring members. A synthetic resin foam body (2b) is filled in a space surrounded by the structural members (11, 12) and the reinforcing member (1).

The invention discloses a prestressed concrete constructing process for a curved shape memory alloy tendon. The constructing process specifically comprises the following steps: a plurality of curved shape memory alloy tendons are embedded into a template along the length direction of the concrete, and two ends of each tendon are allowed to respectively penetrate through and extend out of the template; the concrete is poured in the template and integrally formed along with the curved shape memory alloy tendons; after the concrete strength reaches above 75%, the shape memory alloy tendons are in batches or gradually heated by adopting an electrothermal method, after the shape memory alloy tendons are gradually heated to appointed temperature, the shape memory alloy tendons generate the one-way shape memory effect, so that the lengths of the shape memory alloy tendons trend to be reduced to a primary memory alloy tendon shape, and the concrete generates a certain constraining force so as to generate the prestress. According to the constructing process, the crack resistance, rigidity, durability and application scope of a prestressed structure is improved, and thus the purpose of applying the prestress to the concrete can be achieved, the constructing process is simple, convenient to operate, and safe and reliable in effect.

An ice making apparatus which includes an ice making tray to produce ice and an ejector rotatably disposed at the ice making tray, comprising a plurality of ice making cells formed in the ice making tray, wherein each of the ice making cells includes a freezing portion in which ice is produced and a buffering portion which is formed as a specified space at one side of the freezing portion to prevent water of the freezing portion from flowing out of the ice making tray. Accordingly, even in a refrigerator having the ice making apparatus installed on a rear surface of the door, the ice making apparatus can permanently provide an effect of preventing water inside the ice making cells from flowing out of the ice making tray due to an opening/closing operation of the door.

A sun visor for a vehicle has a sun visor body including a first shell and a second shell. The first shell includes a pin, and the second shell includes a boss having an insert hole. Further, a first reinforcing portion that extends in a given direction from at least one of the pin and the boss and a second reinforcing portion that extends in a direction intersecting with the direction of extension of the first reinforcing portion are provided.

The invention discloses a surface pre-coating method for crack self-repairing of a cement-based material. The method comprises the following steps: (1) preparing bacteria liquid from nutrient immobilized bacillus mucilaginosus powder; (2) adding a hydrophilic thickening agent into the bacteria liquid to obtain repairing liquid; (3) preparing weak-acid pretreatment liquid; and before spraying the repairing liquid, spraying the weak-acid pretreatment liquid to the surface of the cement-based material; and (4) after spraying the weak-acid pretreatment liquid to the surface of the cement-based material for 10min, spraying the repairing liquid. The repairing test result indicates that calcium carbonate can be precipitated at the crack of the cement-based material within 7d; and after 30d of continuous repairing, microcracks with average crack width below 0.4mm can be completely repaired.

The invention discloses a whole-span prefabricated H-steel-concrete composite beam bridge and a construction method. The whole-span prefabricated H-steel-concrete composite beam bridge comprises an H-steel combination and a concrete bridge plate which is poured on the H-steel combination; the H-steel combination comprises H-steels placed in parallel in the bridge width direction; and the whole-span length is the length direction of the H-steels. The whole-span prefabricated H-steel-concrete composite beam bridge has the advantages that the construction of a bridge deck slab is simple and the hoisting weight of the bridge deck slab is light; during making, factory machining and manufacturing procedure does not exist and the later mounting and erecting difficulty is reduced; and meanwhile, as the H-steels can avoid adverse effects such as welding residual stress, more stable mechanical property, better bearing capacity and better durability are obtained; and the making cost can be greatly reduced. Compared with the steel plate girder in the prior art, the whole-span prefabricated H-steel-concrete composite beam bridge has the advantages that the welding or bolting process can be eliminated; construction processes uneasy to control, such as prestressed structure steel strand tensioning and grouting, hollow slab girder hinge joint connection and so on do not exist; the quality of aprofiled-steel composite beam can be effectively guaranteed; and requirements on equipment and technical skills of workers can be reduced.

The invention provides a preparation method of a protection and repair system for the surface of a concrete base, convenient construction is achieved, and a systematic concrete protection and repair system with high adhesive force and durability is provided. The preparation method comprises the steps that the protection and repair system comprises a primer layer, polyurethane mortar layer and a polyurethane weather-proof finish paint layer, wherein the primer layer, the polyurethane mortar layer and the polyurethane weather-proof finish paint layer cover the surface of the concrete base from inside to outside, and the primer layer is obtained by solidifying monoisocyanate-terminated polyurethane prepolymers and a catalyst; the preparation method of the primer layer comprises the steps thatpolyester polyols and first isocyanates are subjected to a thermostatic reaction for 2-3h, a first part of dihydromethyl propionic acid is added to continue the thermostatic reaction for 1.5-2.5h, when the content of isocyanato reaches 16%-23%, cooling is carried out, the catalyst is added, and discharging can be carried out after stirring for 15-20 minutes and standing; and the polyester polyolsare linear or branched polyester polyols, and the mass ratio of the first isocyanate to the polyester polyols is (2.2-4.6) : 1.