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213results about How to "Prevent durability" patented technology

Corrugated steel webplate combined box girder floor system for cable-stayed bridge and construction method thereof

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.
Owner:TSINGHUA UNIV

Method of preparing baking-free load-bearing bricks through steam curing of semidry desulfurization residues

The invention discloses a method of preparing baking-free load-bearing bricks through steam curing of semidry desulfurization residues, belonging to the technical fields of environmental engineering and preparation of construction material. According to the invention, a gelling agent is prepared from semidry desulfurization slag and multi-component powder and is uniformly mixed with inert sandy aggregate in a mixer, water accounting for 10 to 46% of the mass of solid powder is added and uniformly mixed with the solid powder, an obtained mixture undergoes pressure forming and demolding so as to obtain green bricks, and the green bricks are subjected to steam curing at a temperature of 40 to 90 DEG C for 1 to 7 d so as to obtain baking-free bricks with sufficient strength; the baking-free bricks can meet different strength requirements for load-bearing bricks of a model number in a range of MU10 to MU30, have excellent water resistance and can be used as exterior wall tiles. According to the invention, the problem that comprehensive utilization of semidry desulfurization gypsum is not easy due to complex composition of the semidry desulfurization gypsum is overcome; effective usage of solid waste in production of the baking-free bricks which cost less than conventional sintered clay bricks do has great significance to energy conservation and environmental protection.
Owner:HUNAN UNIV OF SCI & TECH

Locally uncombined suspension bridge steel-concrete combined bridge deck system and construction method of combined bridge deck system

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.
Owner:TSINGHUA UNIV

Semi-assembly type retaining wall of soil filling slope and construction method for semi-assembly type retaining wall

The invention relates to the technical field of retaining walls of soil filling slopes, and discloses a semi-assembly type retaining wall of a soil filling slope. The semi-assembly type retaining wall of the soil filling slope comprises a plurality of reinforced concrete piles, pile top tie beams and upright columns, wherein the pile top tie beams are arranged at the upper ends of the reinforced concrete piles; intercolumnar tie beams are arranged in the middles of the upright columns; an intercolumnar gap is formed between each two adjacent upright columns; a balancing beam is arranged on the back side of each upright column; an inter-beam gap is formed between each two adjacent balancing beams; a retaining vertical plate is inserted in each intercolumnar gap; and a balancing flat plate is paved in each inter-beam gap. The retaining wall is provided with the reinforced concrete piles, and is well-adapted to geological conditions; balancing beam and slab structures are arranged on the back sides of the upright columns, so that the stress of the whole retaining wall is reasonable, the construction cost for the retaining wall is saved, and the applicable height of the retaining wall is increased; and moreover, the retaining wall has a semi-assembly structure, the curing period of pouring baffles is avoided, the construction speed is increased, and anchor cables are not required in the retaining wall, so that potential safety hazards caused by the reason that the anchor cables are easy to corrode and poor in durability are avoided.
Owner:SHENZHEN GONGKAN GEOTECHN GRP

Anti-bacterium antivirus guanidine salt star-shaped polymer, preparation method and applications thereof

The invention discloses an anti-bacterium antivirus guanidine salt star-shaped polymer, a preparation method and applications thereof, and the arm number, structure and molecular weight of the star-shaped polymer are controllable. The polymer is prepared by the following steps: adopting a core-first method, taking brominated beta-cyclodextrin as an initiator, guanidine salt oligomer containing carbon-carbon double bonds as the functional monomers, and then carrying out atom transfer radical polymerization so as to obtain the target product, wherein the structure and molecular weight of the polymer can be modulated according to the application needs. The polymer and the preparation method thereof improve the molecular weight of the polymer, achieve chain amplification effect, increase the density of effective functional groups having an anti-bacterium effect, effectively solve the problems of contamination on other products caused by leakage of anti-bacterium agents and nondurable anti-bacterium effect, and eliminate the potential dangers caused by leaked anti-bacterium agents on human health. Furthermore, the polymer has a prominent function, which other guanidine salt polymers do not have, of killing wild type viruses and bacteria such as gland virus, influenza virus, and the like.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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