40results about How to "Reduce cracking damage" patented technology

The invention belongs to the field of building materials, and in particular relates to a functional concrete material and a preparation method thereof. The invention relates to novel heat accumulation concrete for a solar thermal power station. 1 square meter of heat accumulation concrete is characterized by being prepared from the following raw materials by weight: 380 to 450 kilograms/meter<3> of metakaolin, 220 to 310 kilograms/meter<3> of modified sodium silicate solution, 5 to 10 kilograms/meter<3> of water reducing agent, 900 to 1,200 kilograms/meter<3> of basalt, 590 to 710 kilograms/meter<3> of fine aggregates, 10 to 20 kilograms/meter<3> of steel fibers, 0.5 to 1 kilogram/meter<3> of organic fibers and 10 to 20 kilograms/meter<3> of graphite powder, wherein a liquid-solid ratio of the modified sodium silicate solution to the metakaolin is (0.60-0.70):1; and the fine aggregates comprise ordinary sand, copper ores and steel slag sand. The high-temperature heat accumulation material prepared by the method has the characteristics of low cost, stable performance, high coefficients of heat conductivity, high durability and the like, and is easy to prepare on site.

The invention discloses a novel earthquake damage control system for a thin-wall hollow pier. The novel earthquake damage control system comprises a pier base, a thin-wall hollow pier, high-tenacity fiber-enhanced cement-based composite material expanded sections, an unbonded prestressed tendon and steel energy consumption elements, wherein the thin-wall hollow pier is arranged on the upper end surface of the pier base, so that the torsional strength and the energy-dissipating capacity of the thin-wall pier are improved. The high-tenacity fiber-enhanced cement-based composite material expanded sections are arranged on the inner side and the outer side of the lower part of thin-wall hollow pier; a series of steel energy consumption elements are arranged in the thin-wall hollow pier along the pier height; the lower part of the unbonded prestressed tendon is anchored on the pier base; and the upper part of the unbonded prestressed tendon is anchored at the center of the first steel energy consumption element from bottom to top. By virtue of the unbonded prestressed tendon, the self-resetting capacity of the pier after the earthquake is provided; and the crack width of the pier after the earthquake is reduced. By virtue of the high-tenacity fiber-enhanced cement-based composite material expanded sections, the axis-compression ratio of the bottom section of the thin-wall hollow pier is reduced; the shear-bearing capacity and the anti-bending capacity of the thin-wall hollow pier are increased; and the steel energy consumption elements can be arranged as rapid exchange components, so that the repairability after the earthquake is increased.

The invention provides a reinforcing and repairing structure for a purlin and a beam node of a historic building. The two ends of the purlin are erected above a beam head; pillow-shaped timbers are arranged on the left and right sides of the beam head; the pillow-shaped timbers are arranged between the purlin and a purlin frame; the bottom surfaces of the pillow-shaped timbers are ejected above the purlin frame; the heights of the pillow-shaped timbers are greater than the height of the beam head; the widths of the pillow-shaped timbers are greater than the diameter of the purlin; and on the basis of not changing raw materials and a construction process, the purlin and the beam node of the historic building are reinforced.

The invention relates to a self-repairing cyanate ester resin system and a preparation method of the self-repairing cyanate ester resin system. The preparation method comprises the steps of adding vinyl terminated poly-p-phenylene oxide (PPO) resin with low molecular weight into a cyanate ester (CE) resin system, and using 4,4 phi-diamino diphenyl sulfone (DDS) as a catalyst to treat the CE/PPO resin system through low-temperature process to obtain the self-repairing cyanate ester resin system with high performance. According to the technical scheme, the vinyl terminated PPO is utilized for maintaining thermoplasticity of the CE during forming; after the cured CE resin system is damaged, the PPO ingredients can be melted and flow to fill a crack to realize material repairing through a heating system, therefore, the vinyl terminated PPO has positive effects on prolonging the service life of the material and improving the safety of the material; the resin system can be used for preparing high-performance composite materials, electronic devices and the like for aerospace construction.

The invention relates to the technical field of fixed buildings, in particular to a gravity type damping filling wall which comprises a frame structure, two brickworks arranged in the frame structure side by side, and prestress ribs located on the two sides of the two brickworks and crossed at the diagonal position of the frame structure. A steel groove support is arranged below each brickwork. The two ends of each steel groove support are connected with the ground through opposite supporting legs respectively. Slide grooves are formed in the supporting legs. V-shaped supports are arranged between every two opposite supporting legs. The two ends of each V-shaped support are arranged in the slide grooves of the corresponding supporting legs on the two sides. Slide wheels are arranged at the bottom ends of frame columns of the frame structure. The top ends of the prestress ribs are fixed to the upper portion of the frame structure. The bottom ends of the prestress ribs are wound around the slide wheels and fixed to the middles of the V-shaped supports on the corresponding sides. By stretching or releasing the prestress ribs, the field angles of the V-shaped supports are changed. The two brickworks in the frame structure deform in the lateral direction of the frame structure so as to vertically and oppositely move, and therefore energy consumption happens to a damping medium in the filling wall, and the risks of cracking breakage and plane outward collapse of the filling wall are reduced.

The invention discloses a semiconductor device with a conductive lug and a method for preparing the same, wherein the method mainly is that: a first metal layer electrically connected with the welding pad is formed on a semiconductor base material with a welding pad and a protective layer and is covered with and partially exposed from a second covering layer; and a second metal layer which is in electric connection with the first metal layer form the exposed part is formed on the second covering layer, and is covered with and is exposed partially from an opening of a third covering layer, and a conductive bump having a metal column and a soldering tin material is formed on the second metal layer in the opening accordingly, thereby providing a buffer effect by means of the covering layers and the metal layers and avoiding the problem of layer separation because the prior under bump metallurgy of a welding block formed on the welding pad directly withstands the stress transmitted by the metal column.

The invention provides a train wheel and a train. The train wheel comprises a hub and a rim, wherein the hub is connected with the rim through wheel disks, the thickness of the rim is 6%-7% of the diameter of a rolling circle of the wheel, and the thickness of the hub is 5%-6% of the diameter of the rolling circle of the wheel; the thickness of each wheel disk close to the rim is 2%-3% of the diameter of the rolling circle of the wheel; the thickness of each wheel disk close to the hub is 4%-5% of the diameter of the rolling circle of the wheel. According to the train wheel and the train, sizes of various parts of the wheel are optimized, stress distribution of the various parts can be even under the circumstance that the wheel is subjected to alternating stress, and the probability of the phenomena of cracking and damage to the wheel due to deformation and uneven stress is reduced.

The invention discloses a laser cladding device and a laser cladding method for a long and thin workpiece. The laser cladding device comprises a clamping jaw, an ejector pin, a telescopic preheating sleeve, a laser cladding nozzle, a first guide rail and a second guide rail, wherein the clamping jaw and the ejector pin clamp the two ends of the workpiece; the laser cladding nozzle slides on the first guide rail; the telescopic preheating sleeve comprises a plurality of sections of heating cylinders of which the diameters are sequentially reduced from the clamping jaw to the ejector pin; the heating cylinder with the maximum diameter is connected to the first guide rail through a first bracket in a sliding manner; the heating cylinder with the minimum diameter is connected to the second guide rail through a second bracket in a sliding manner; the telescopic preheating sleeve synchronously moves and contracts along with the movement of the laser cladding nozzle, so that the workpiece isalways kept in a preheating state before laser cladding; after the laser cladding of the workpiece is finished, the telescopic preheating sleeve reversely moves and stretches, so that the workpiece issubjected to heat treatment; the workpiece is clamped and then preheated, so that the safety of a worker in the operation process is protected; and the workpiece is preheated and subjected to heat treatment, so that the residual stress of a cladding layer can be effectively controlled, the crack damage is reduced, and the laser cladding quality is improved.

When a domain inversion part is produced by means of electric field polling process, damage in the vicinity of the forward end of a comb electrode and deviation of width of each domain inversion part are to be reduced. A polarization domain inversion structure has polarization domain inversion parts is produced by electric field poling process using a comb electrode formed on one surface of a substrate of a ferroelectric single crystal and of a single domain, and the comb electrode has a plurality of electrode portions and feeding portion. Each of the electrode portions corresponds with each domain inversion part of the domain inversion structure. The electrode portion has a plurality of low resistance pieces arranged in a direction “F” intersecting the longitudinal direction “E” of the electrode portion and spaced apart with each other.

The invention relates to a bicycle fork body device. The bicycle fork body device comprises a bifurcated rod, a connecting rod and an accessory, wherein the bifurcated rod comprises two hollow supports and a base portion for connecting one ends of the two supports, and a combined hole which runs through the top end of the base portion to the bottom end of the base portion is formed in the base portion; the accessory arranged in the combined hole comprises a pipe casing part and a long pipe fitting, wherein the pipe casing part is arranged in the combined hole in an assembling manner; a set of holes are additionally formed and run through the pipe casing part; the long pipe fitting penetrates through the set of holes; an annual retaining part extends outward on the peripheral side of the long pipe fitting at one end close to the bifurcated rod; an insertion space is formed between an outer wall surface of the long pipe fitting and an inner wall surface of the pipe casing part; the connecting rod is sheathed in the long pipe fitting and enters the insertion space towards the direction of the bifurcated rod. According to the device, the accessory is set, so that the connecting rod can be quickly connected with the bifurcated rod, a fork body can maintain the existing strength, the overall weight can be lightened, and the occurrence of cracks and damages can be reduced.

The invention belongs to the technical field of electric vehicles, and specifically relates to a battery pack box body and a battery pack. A first skirt edge is arranged on the periphery of an upper box cover, a second skirt edge is arranged on the periphery of the top of a lower box body, the upper box cover and the lower box body are combined together in a matched mode in the mode that the firstskirt edge and the second skirt edge are overlapped and fixed together, and a sealing strip is arranged between the first skirt edge and the second skirt edge. The module mounting beam is mounted onthe inner upper side of the lower box body and provided with a fixing part for fixing a battery module, L-shaped fixing lugs are arranged at the two ends of the module pressing strip, and a block-shaped reinforcing rib and a strip-shaped reinforcing rib are formed on the inner bottom face of the lower box body in a punching mode. The pressing strip structure fixing mode is high in strength, good in stability, simple in installation process, light in weight and high in efficiency, and the safety performance of a system is improved. Installation process is simple, weight is light, and efficiencyis high. The battery pack box body adopts an enveloping structure, the height of the side keel is designed at the height of the gravity center horizontal plane of the battery pack cell, the lower boxbody strength is increased, the battery module fixed horizontal plane moment arm is zero, and the tension fracture damage of the moment to the battery pack box body is reduced.

The invention relates to a battery box body, which comprises an upper cover, a sealing strip, modules and a lower box body, wherein upper bosses and lower bosses are arranged on the upper surface andthe lower surface of the sealing strip separately; mounting angles are arranged on two opposite side surfaces of each module; the mounting angles on two side surfaces of the module are horizontally arranged in a staggered manner; the horizontal heights of the mounting angles and the gravity center of each module are located in the same horizontal plane; support keels and mounting brackets of a structure shaped like a Chinese character ''ji'' are arranged in the lower box body; each module is hoisted between two adjacent mounting brackets in the lower box body; the mounting angles of two adjacent modules are horizontally arranged on the corresponding mounting brackets in a staggered manner; and the sealing strip is arranged between the upper cover and the lower box body and seals the uppercover and the lower box body through bolts. According to the battery box body, tensile breakage of torque to the box body is reduced, the volume density of the battery box body is improved by adoptingstaggered installation, the airtightness of the battery box body is improved through designing the bosses on the sealing strip; and the structure strength of the battery box body is strengthened through coordination design of the keels and the mounting brackets.

The invention discloses a negative-pressure casting sealed tank for an aluminum impeller. The negative-pressure casting sealed tank comprises a shell, wherein an upper cover is arranged at the upper end of the shell; a circular hole is formed in the center of the upper cover; a sealing groove is annularly formed in the bottom surface of the upper cover corresponding to upper end face of the shell; a sealing ring is arranged in the sealing groove; a groove is formed in the bottom in the shell; a piece of active cold iron is arranged in the groove; a gypsum mold shell is arranged on the active cold iron in the shell; the upper part of the gypsum mold shell passes through the circular hole in the center of the upper cover; a sealing ring is arranged between the edge of the circular hole in the center of the upper cover and the gypsum mold shell; a suction opening is formed in the side wall of the shell; a pipe joint for vacuumizing is arranged on the suction opening. The negative-pressure casting sealed tank has the advantages of simple structure, convenience in operation and the like. A double-layer structure consisting of a tank body and the upper cover is adopted, and the upper cover and the tank body are sealed movably, thereby reducing the impact of mold clamping force on a gypsum mold, lowering the cracking proportion of the gypsum mold, adapting to negative-pressure casting of a booster impeller, and reducing crack damages to the gypsum mold during sealing.

The invention discloses a high-toughness functionally graded material slide-resistant pile. The high-toughness functionally graded material slide-resistant pile comprises a PVA-ECC material protection layer, tensile area small-particle-size coarse aggregate concrete and a compression area large-particle-size coarse aggregate concrete layer. The PVA-ECC material protection layer, the tensile area small-particle-size coarse aggregate concrete layer and the compression area large-particle-size coarse aggregate concrete layer are sequentially arranged from inside to outside in the landslide thrust direction, and different subareas are poured at the same time. Functional division is carried out according to different stress characteristics of the section of the slide-resistant pile, different material designs are carried out according to a gradient structure, and the prepared functionally graded material slide-resistant pile has high toughness, better deformation ductility and bending and shearing bearing capacity. Steel strands and the small-particle-size coarse aggregate concrete in the tension area can keep deformation coordination, meanwhile, the PVA-ECC protection layer with excellent ductile deformation is arranged on the portion bearing the landslide thrust, cracking damage is reduced, and the toughness and the bending resistance of the whole pile body are improved.

The invention discloses a steel bar surface type connecting joint adopting a nodular cast iron member. The steel bar surface type connecting joint comprises a shield segment and a subway station wall column, the shield segment and the subway station wall column are connected through the nodular cast iron member, a tooth groove shear-resistant member and a non-bonding section prestressed steel bar, and the nodular cast iron member comprises a belly part, an upper wing and a lower wing. The belly part is connected with the tooth groove shear-resistant member, a longitudinal tensile steel bar is arranged in the shield segment, the non-bonding section prestressed steel bar is arranged in the subway station wall column, and the longitudinal tensile steel bar and the non-bonding section prestressed steel bar are connected through a longitudinal steel bar connecting sleeve. The steel bar surface type connecting joint has high connection strength and energy dissipation performance, is suitable for complex underground engineering construction, can bear large bending moment and shearing force at the same time, and is good in anti-seismic performance; and the duct piece section embedded nodular cast iron member is adopted, so that an embedded member is coordinated with concrete deformation, concentrated stress of longitudinal connecting steel bars is avoided, the integrity of the longitudinal connecting steel bars is enhanced, and a surface type connecting mode of the steel bars is formed.