126 results about "Proof construction" patented technology

The invention relates to quake-proof construction steel with lamellar tearing resistance and excellent performance and a production method thereof. The steel is suitable for steel plates of which the thicknesses are between 20 and 100 millimeters and comprises the following chemical components: less than or equal to 0.015 percent of C, less than or equal to 0.015 percent of Si, less than or equal to 0.015 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.02 to 0.04 percent of Nb, 0.005 to 0.020 percent of Ti, 0.010 to 0.060 percent of Als and the balance of Fe. The method comprises the following steps of: performing the pretreatment of molten iron; performing desulfuration treatment; controlling target components of a smelting terminal point, wherein the target components comprise 0.05 to 0.07 percent of [C] and less than or equal to 0.015 percent of [P]; refining through a ladle furnace, and feeding aluminum wires and blasting argon; performing relative humidity (RH) vacuum treatment, and introducing the argon before the treatment; adding SiCa wires; casting continuously and performing the pouring of full-process protection; heating casting blanks; performing rough rolling; performing precision rolling; and cooling. The steel of the invention has the excellent quake-proof performance (ReH/Rm is less than or equal to 0.77); and the contractibility rate of a cross section in the full-thickness direction is between 40 and 70 percent, so the steel meets the requirements of key stressed points of major constructions such as steel structure work and the like fully.

The invention relates to a 690MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel which comprises the following components in percentage by weight: 0.051-0.155% of C, 0.20-0.60% of Si, 1.82-2.55% of Mn, at most 0.008% of P, at most 0.002% of S, 0.081-0.090% of Nb, 0.010-0.025% of Ti, 0.41-0.60% of Mo, 0.08-0.10% of W, 0.0071-0.0095% of Mg and at most 0.0010% of O. The production method comprises the following steps: desulfurizing molten iron; smelting in a converter; carrying out vacuum treatment, and adding the Mg element; carrying out conventional continuous casting, and heating the casting blank; carrying out sectional rolling; and carrying out finish rolling, and cooling for later use. The steel has the following advantages: the chemical components and technique are simple, the yield strength of the steel plate is 690-850MPa, the earthquake-proof property is good (the yield-tensile ratio is at most 0.83), the fire resistance is favorable (the yield strength at 600 DEG C is not lower than 2/3 of that at room temperature), and the corrosion resistance is better than CortenB. Besides, the steel grade has excellent impact toughness and weldability.

The invention relates to a 550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel which comprises the following components in percentage by weight: 0.041-0.125% of C, 0.31-0.62% of Si, 1.81-2.40% of Mn, at most 0.008% of P, at most 0.002% of S, 0.041-0.065% of Nb, 0.007-0.020% of Ti, 0.41-0.63% of Mo, 0.07-0.10% of W, 0.0071-0.0098% of Mg and at most 0.0012% of O. The production method comprises the following steps: desulfurizing molten iron; smelting in a converter; carrying out vacuum treatment, and adding the Mg element; carrying out conventional continuous casting, and heating the casting blank; carrying out sectional rolling; and carrying out finish rolling, and cooling for later use. The steel has the following advantages: the chemical components and technique are simple, the yield strength of the steel plate is 550-700MPa, the earthquake-proof property is good (the yield-tensile ratio is at most 0.83), the fire resistance is favorable (the yield strength at 600 DEG C is not lower than 2/3 of that at room temperature), and the corrosion resistance is better than CortenB. Besides, the steel grade has excellent impact toughness and weldability.

A scope unit 2 including a control unit 3 and an insertion portion 4 is attached to a main unit 1 via a scope connector 5. An optical adaptor 8 is attached to a tip of the insertion portion 4. The CCD 31, HICs 32, 33, and the thermistor 34 are attached to the tip of the insertion portion 4. A liquid crystal module 36 is attached to the optical adaptor 8. A barrier circuit 64 limits energy supplied to these components in a circuit disposed in the scope unit 2. By disposing the barrier circuit 64 in the scope connector 5, the portion extending from the barrier circuit 64 to, i.e., the control unit 3, the insertion portion 4, and the optical adaptor 8 are of the explosion-proof construction. Thus, these can be used in a hazardous explosive location. Thus, an endoscope apparatus that can be used in combustible gas or dust can be provided.

The invention relates to a manufacturing method of steel pipes, in particular to a manufacturing method of a thick wall steel pipe with a small radius-thickness ratio used for a building structure. The manufacturing method comprises the following steps of: with a Q345GJ-B-level steel pipe as a mother blank, blanking, heating, rolling into a circle, welding, correcting distortion, carrying out heat treatment and the like to obtain the thick wall steel pipe with the small radius-thickness ratio. The steel pipe is suitable for requirement of earthquake proof construction of the building structure and has lower manufacturing cost.

A system and method for cryptographically checking the correctness of outsourced set operations performed by an untrusted server over a dynamic collection of sets that are owned (and updated) by a trusted source is disclosed. The system and method provides new authentication mechanisms that allow any entity to publicly verify a proof attesting the correctness of primitive set operations such as intersection, union, subset and set difference. Based on a novel extension of the security properties of bilinear-map accumulators as well as on a primitive called accumulation tree, the system and method achieves optimal verification and proof complexity, as well as optimal update complexity, while incurring no extra asymptotic space overhead. The method provides an efficient proof construction, adding a logarithmic overhead to the computation of the answer of a set-operation query. Applications of interest include efficient verification of keyword search and database queries.

The invention discloses a leakage-proof construction method for building roofs. For the cracks at the building roof of prefabricated plate or cast-in-place structure, the method comprises the following steps of: cleaning the cracks by water; pouring an absorbent resin in the cracks by a high-pressure pump or mixing a sodium methane-siliconic alkoxide and a polyethylene by the weight ratio of 8:1 uniformly and filling the mixture in the cracks; coating a polyisobutene on the upper surface of the absorbent resin till the thickness being of 2-3mm; and covering the upper surface by a fiberglass cloth. For the leakage at the top of the building due to missing edge or corner and unevenness on the roof surface, the method comprises the following steps of cleaning up the roof surface, using a polyvinyl alcohol cement mortar, mixing the sodium methane-siliconic alkoxide as well as a water (8 weight parts) uniformly and spraying the mixed solution on the roof surface; mixing the sodium methane-siliconic alkoxide and water by the weight ratio of 1:8 uniformly and mixing the mixed solution with the cement mortar material by the weight ratio of 1:2 uniformly, and smearing the mixture on the roof surface till the thickness being of 8-12mm. The method has the advantages that the roof with the leakage supplemented has long service life ranging from 15 years to 25 years generally.

The invention discloses quake-proof construction steel with the yield strength of 160MPa and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.002 to 0.005 percent of C, less than or equal to 0.03 percent of Si, 0.10 to 0.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.002 to 0.007 percent of Mg, 0.020 to 0.070 percent of Ti, 0.010 to 0.030 percent of Nb, 0.001 to 0.003 percent of N, less than or equal to 0.050 percent of Al, and the balance of Fe and inevitable impurities. The production method thereof comprises the steps of desulfuration of molten iron, converter blowing, vacuum treatment, continuous casting, hot rolling, cooling and the like. When the yield strength of steel products exceeds 180Mpa, an annealing treatment step is added after the cooling step. Experiments prove that the quake-proof construction steel with the yield strength of 160MPa has the characteristics of low yield strength, high elongation and excellent impact toughness; and the production method of the steel has the advantages of simple process flow and low production cost.

The invention belongs to a water-proofing constructing method for junctions between pipelines and floors of buildings, smearing adhesive watertight material on the junction between outer surface of pipeline or floor drain and floor seam, compacting the watertight material with shaping disc, and after the watertight material is solidified, obtaining a watertight component compounded of watertight material and shaping disc. And the standard shape of the shaping disc becomes a standard shape of the watertight component. And it has advantages of: raising yield of watertight finished products, raising construction efficiency, etc.

The invention discloses a production method of four-segment high-strength aseismic reinforcement, and belongs to the technical field of steel for earthquake proof construction. Controlled rolling and controlled cooling processes are low-temperature initial rolling of a heating furnace, water cooling before pre-segmentation, four-line pre-segmentation, four-line segmentation, finally rolling, and two-stage control cooling after rolling. The production method has the advantages that minimization of micro-alloy elements of four-line segmentation of phi12mm and phi14mm under the condition that the edge organization of a basic circle is P+F is achieved; and the problems of low-temperature phase change organization, four-line line difference, poor mechanical property and the like caused by bending and water cooling in the four-line low temperature segmentation and water cooling processes are avoided.

A rubber plug (40) is provided with a stable sealing property while reducing frictional resistance when the rubber plug (40) is inserted into a cavity. In a cross section including axis lines of the rubber plug (40), a cavity (11) and a wire (30), areas of outer lips (44A, 44B) not resiliently deformed radially outward of a virtual line (12L) corresponding to the inner circumferential surface of the cavity (11) are specified as outer virtual deforming portions (45A, 45B), areas of inner lips (46A, 46B and 46C) not resiliently deformed radially inward of a virtual line (31L) corresponding to the outer circumferential surface of the wire (30) are specified as inner virtual deforming portions (47A, 47B, and 47C) and at least parts of the inner virtual deforming portions (47A, 47B and 47C) correspond to only parts of the outer virtual deforming portions (45A, 45B).

A lithium battery electric core explosion prevention and power-off protection device and a producing method. The device comprises an electric core casing, a metal top cover, a metal rupture disc, a metal vent hole plate, an annular insulation spacer, an annular sealed ring and an electric core tab. The explosion-proof construction are arranged on the rupture disc and the vent hole plate and comprises a V-shaped ring groove on the vent hole plate and a ring groove on the rupture disc. The rupture disc and the vent hole are connected through multi-point connection mode. The method comprises: stamping molding of top cover, rupture disc, vent hole plate and insulation spacer, injection moulding of sealing ring at high temperature, edging of rupture disc and laser welding of rupture disc and vent hole plate and sealing connection of parts and with the electric core. When the inner pressure of the electric core is higher than the preset value, an upward pressure through the vent hole lifts the recess of the rupture disc and cuts off the V-shaped ring groove of the vent hole plate and switches out the circuit by separating from the rupture disc. If the inner pressure enhances continuously, the ring groove of the rupture disc is cut off for pressure relief.

The invention discloses a constructional method for preventing water seepage longitudinal cross flow between composite lining layers in an underwater tunnel. The steps of the constructional method are as follows: A cleaning dust and impurities on the surface of a primary support; B. spraying water to wet the dry surface of the primary support; C. mechanically and uniformly stirring cement and water into grout for further use; D. bouncing out coiled materials from a base layer of the primary support to pave and paste control lines and Bondsure BAC double-faced self-adhere type water resistant coiled materials, paving and pasting the grout on the base layer, and rolling and paving the coiled materials forward along a datum line; E. welding the Bondsure BAC double-faced self-adhere type water resistant coiled materials with a composite water resistant layer after the grout begins to have strength; F. adopting a steel moulding plate trolley pump to cast a secondary lining after the construction of the composite water resistant layer is finished. The method is simple, convenient in construction, and solves the problem of the water seepage longitudinal cross flow between the primary support and the composite water resistant layer in the underwater tunnel. The method effectively prevents the water seepage at the back of a water pressure resistant lining from crosswise flowing to a water pressure nonresistant lining, and has good application value for underwater tunnels built by a drilling and blasting method.

A vibration-proof construction method for preventing and reducing vibration around a structure which generates vibration or receives vibration includes construction work wherein a hard member having higher stiffness than the surrounding ground and a rubber elastic member are adjacently laid underground, around or directly underneath the building structure, thereby forming a hard layer and an elastic layer. The hard member is preferably concrete, hardening-treated soil, or iron material, and the rubber elastic member is preferably scrap tires or pulverized scrap tire material. Thus, a practical and excellent vibration-proof construction method is provided, whereby even better vibration-proof effects can be obtained, and which contributes to reduction in construction costs.

The invention discloses a leakage-proof construction method combining a tower crane foundation and a basement floor. The method comprises the following steps: excavating an earthwork groove and building a brick membrane along an inner wall of the earthwork groove, laying a waterproof material, distributing a foundation reinforcement cage, mounting supporting feet of a tower crane, mounting a grounding device, pouring concrete, mounting standard sections of the tower crane and the like. The leakage-proof construction method has the advantages that problems in a utilization process of the tower crane that the standard sections of a tower body are immersed in water for a long period to cause potential safety hazards including rusting and the like and the water is deposited in an installation position of the tower crane for a long period are effectively avoided, a dismounting procedure of the tower crane is simplified and the stability of connection between the earthwork groove and the basement floor is increased after the concrete is poured into the earthwork groove; and the leakage-proof construction method has very good leakage-proof effect and is suitable for being applied to a tower crane construction process of various types of mid-rise buildings and high-rise buildings.

The invention belongs to the field of metal plate strip production, and in particular, relates to a hot-continuous-rolled steel strip for a 500 MPa-grade earthquake-proof construction structure and aproduction method thereof. The hot-continuous-rolled steel strip for the 500 MPa-grade earthquake-proof construction structure comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 0.15-0.30% of Si, 1.20-1.60% of Mn, 0.05-0.10% of V, 0.010-0.035% of Ti, P not more than 0.020%, S not more than 0.015%, 0.020-0.060% of Als, and the balance of Fe and inevitable impurities. In the hot-continuous-rolled steel strip for the 500 MPa-grade earthquake-proof construction structure, the yield strength is 500-630 MPa, the tensile strength is 610-770 MPa, the yield ratio is not more than 0.81, the ductility is not less than 24%, the 0-DEG C impact power is not less than 54 J, the yield platform length is not less than 2.2%, the carbon equivalent Ceq is not more than 0.45%, and the welding crack sensitivity index Pcm is not more than 0.28%.

The invention relates to a halogen-free inflaming retarding water-proof construction sheet of a weldable elastomer; TPO is taken as a matrix resin; the matrix resin is mixed with flame retardants according to a proportion; the mixed material is plasticated by two rollers under the temperature of 130 to 150 DEG C and is shaped in a hot-press way by a flat vulcanizing machine under the temperature of 160 to 170 DEG C to obtain the sheet; wherein, the flame retardants are divided into an inorganic flame retardant and an expansion flame retardant; the inorganic flame retardant is modified magnesium hydrate; expansion flame retardant is mixed and compositely prepared by monoammonium phosphate, faecula and magnesium hydrate. The halogen-free inflaming retarding water-proof construction sheet of the weldable elastomer has the advantages of effective flame retardation and excellent comprehensive mechanical property as well as being capable of improving the durability and the weatherability.

The invention discloses a water-proof construction method for connected nodes of a foundation slab and a ground wall in a composite surround system, and relates to the technical field of underground engineering water-proof construction. The water-proof construction method aims at the problems that the interface of a new concrete structure and an old concrete structure and the chiseled portion of a bored cast-in-place pile are prone to forming underground water seepage path, and the construction quality of the foundation slab is influenced. The water-proof construction method comprises that 1, a sunken portion is dug on the edge of a foundation pit, a concrete base layer is constructed, a first geosynthetic clay liner is laid to the bored cast-in-place pile, and closing up is carried out; 2, the foundation slab to be poured and a reinforcing steel bar bracket to be turned downwards are erected and bond, and a space on the edge of the foundation slab to be poured is reserved; the foundation slab is poured, and the bracket is turned downwards; 3, the portions, over the bottom elevation of the foundation slab, of the bored cast-in-place pile and a high-pressure jet grouting pile are chiseled away, and a depth D is dug downwards along the bottom elevation of the foundation slab continuously; a base layer is poured on the chiseled portion and coated by a second geosynthetic clay liner, and closing up is carried out; and 4, after a pouring belt is poured, the pouring belt and the foundation slab are fixedly connected into a whole.