34results about How to "Increased mechanical occlusion" patented technology

The invention provides a steel tube concrete and sprayed concrete stiff combined structure tunnel support system and a construction method. Multiple steel tube concrete arch frames are arranged and are sequentially arranged in the longitudinal direction of a tunnel, and each steel tube concrete arch frame comprises multiple spliced square steel segments and fine aggregate concrete materials injected in steel tubes. After splicing of each steel tube concrete arch frame is completed, injection and filling are carried out in a segmented manner. Multiple cotter shearing force parts are fixed to the longitudinal inner and outer tube faces of each steel tube concrete arch frame. The left side and the right side of each transverse partition plate are connected with L-shaped embedded plates, and the L-shaped embedded plates are fixed to the longitudinal tube faces of the steel tube concrete arch frames. Multiple ring steel bars are welded to each transverse partition plate in a penetrating manner. The space between the steel tube concrete arch frames is filled with sprayed concrete, and the thickness of the sprayed concrete is flushed with the steel tube concrete arch frames. By means of the system, the bearing force and corrosion resistance of the square steel arch frames are enhanced, and the bonding capacity of the support system and the sprayed concrete is improved.

The invention discloses a preparation method of a carbon fiber and metal composite structure, which comprises the following steps: 1. carrying out shot blasting or shot penning treatment on the bonding surface of metal at least once to form roughened metal; 2, spraying an acetone resin solution on the surface of the rough metal, and carrying out pretreatment; 3, coating the surface of the pretreated rough metal with a binder; 4, carrying out infiltration treatment on an aramid short fiber film by using an acetone resin solution, and placing the aramid short fiber film on the rough metal surface; and 5, carrying out infiltration treatment on carbon fiber cloth by using an acetone resin solution, coating the surface of the carbon fiber cloth with a binder, covering the rough metal surface treated in the step 4 with the carbon fiber cloth, and carrying out static pressing until the carbon fiber and metal composite structure is cured and molded. Joint reinforcement of two interface layersbetween metal and a binder and between carbon fibers and the binder and a binder layer is realized.

The invention belongs to the technical field of road engineering materials, and discloses a road base material and a preparation method thereof, the road base material comprises the following raw materials by weight: 24-58 parts of modified coal gangue, 10-36 parts of cement, 5-9 parts of silicon powder, 10-23 parts of gravel, and 2-3 parts of a water reducer. The invention also provides a preparation method of the road base material and a stirring device for preparing the road base material. The coal gangue can be effectively utilized, harm to the ecological environment is reduced, and the performance of the road base material is improved.

The invention relates to an injectable vertebra repairing device for treating a spinal vertebral fracture.The injectable vertebra repairing device comprises an injectable chain and a filling tool; the injectable chain is in the shape of a cylinder with the rough surface, a central through hole is formed in the injectable chain, multiple grooves are formed in the upper portion and the lower portion of the chain, and the grooves are communicated with the central through hole; the filling tool comprises a filling casing pipe and a push rod casing pipe, and the tail end of the filling casing pipe and the tail end of the push rod casing pipe are provided with grab handles respectively; the front end of the push rod casing pipe and the near end of the injectable chain are designed to be of a tapper thread structure.When the device is operated, the top end of the filling casing pipe stretches into the lesion part, and the chain is filled into the damaged vertebra through the push rod casing pipe; bone cement is injected into the central through hole of the chain through the push rod casing pipe; the central through hole and the grooves are sequentially fully filled with the bone cement, solidification is performed to complete repairing, pressure exerting on the lesion part can be uniform and be reduced, and therefore the effect of effectively repairing the vertebra is achieved.The injectable vertebra repairing device is applied to the field of medical instruments and mainly used for achieving the purposes of stabilizing the fracture, recovering the vertebral mechanical strength and relieving pain.

The invention belongs to the technical field of surface engineering and relates to a plating of a high-volume-fraction silicon carbide particle reinforced aluminum-based composite and preparation method thereof. The high-volume-fraction silicon carbide particle reinforced aluminum-based composite is hereinafter called high-volume-fraction SiCp / Al composite. By means of plating on the surface of the high-volume-fraction SiCp / Al composite, the electric conduction function, the microwave transmission function, the welding function and the like of the high-volume-fraction SiCp / Al composite can be guaranteed. The plating is mainly applied to high-volume-fraction SiCp / Al composite load structure products such as spacecraft high-power microwave products, phased-array antennas and aerospace power sources.

The invention relates to a prefabricated sandwich wall panel utilizing loose heat insulating materials and a manufacturing process thereof, belonging to the technical field of building energy-saving materials. The invention aims at the problems of poor thermal insulation effect and poor fire resistance of the sandwich wallboard, changes the internal structure and manufacturing process, optimizes the stress mode of the sandwich wallboard, and has the advantages of light weight, good integrity, high thermal insulation efficiency, It has the advantages of strong fire resistance, durability and good economic benefits. Splice one side of the foam plate and the foam web into one, fill the loose insulation material in the cavity formed by the foam web, splice the other side of the foam plate, and wrap the FRP material on the outer surface of the foam plate and the foam web After the FRP shell is solidified, the fiber braided mesh is laid on both sides of the insulation layer and in the channel reserved to accommodate the cross-shaped web, and the foam web and the fiber braided mesh in the two foam flat plates are connected as one by sewing technology , impregnated with epoxy resin, then poured high-performance concrete, and removed the formwork after 14 days of curing.

The invention provides a microbial repairing agent for self-repairing of marine concrete cracks, which belongs to the technical field of concrete self-repairing, and comprises Bacillus kirsi, regulator, calcium lactate, and coral reef calcareous sand, and uses polyoxyethylene, vinyl methyl ether After the coral reef calcareous sand is treated, the Bacillus colii, regulator and calcium lactate are immobilized on the coral reef calcareous sand. The invention can increase the surface roughness of coral reef calcareous sand, improve the bonding strength of the interface transition zone, reduce gaps, and suppress SO 4 2‑ Enter the interior of the concrete to reduce the increase of expansive erosion products; the calcium carbonate particles that can regulate the formation of Bacillus kirsi are mainly stable calcite type, and can form a dense and structurally stable sealing layer in the cracks.

The invention belongs to the technical field of building materials, and proposes a fast-hardening and early-strength composite repair mortar, which is composed of the following components in weight percent: 5% to 10% of water, 20% to 30% of cement, and 1% to 5% of silica fume. %, fly ash 1% to 5%, quartz sand 50% to 70%, composite early strength agent 0.4% to 0.5%, water reducing agent 0.06% to 0.1%, rubber powder 1% to 5%, mixed fiber 0.06% ~0.8%, the composite early strength agent is composed of A component and B component, the A component is nano-calcium carbonate whiskers, and the B component is a mixture of triisopropanolamine and aluminum sulfate, so The quartz sand is composed of coarse sand, medium sand and fine sand, and the hybrid fiber is composed of basalt fiber and polypropylene fiber. The invention solves the problems in the prior art that the strength of the repair mortar shrinks back, the dry shrinkage rate is large, and the bonding strength is low.

The invention discloses a stone aggregate wrapped by a microfine fibre polymer mortar thin layer and a preparation method thereof; the stone aggregate is formed by stone aggregate inner cores, an adhesive inner wrapping layer, a polymer cement mortar outer wrapping layer and an adhesive microfine fibre hair layer, wherein the adhesive inner wrapping layer and the stone aggregate are adhered firmly; microfine fibre filaments are anchored and rooted on the adhesive inner wrapping layer; and the polymer cement mortar outer wrapping layer and the adhesive inner wrapping layer are soluble mutuallyand can effectively form a whole body. Active powder in the polymer cement mortar outer wrapping layer contains silica fume, zeolite powder, finely-ground mineral slag, pulverized coal ash and the like, and can generate volcanic ash reaction with Ca(OH)2 crystal at the interface position of the set cement so as to generate gelled materials, and further carry out improved treatment on the weakest interfaces of set cement and the stone aggregate in concrete. The modified stone aggregate of the invention has good affinity with the set cement, and has higher binding power with the set cement.

The invention relates to an injectable vertebra repairing device for treating a spinal vertebral fracture.The injectable vertebra repairing device comprises an injectable chain and a filling tool; the injectable chain is in the shape of a cylinder with the rough surface, a central through hole is formed in the injectable chain, multiple grooves are formed in the upper portion and the lower portion of the chain, and the grooves are communicated with the central through hole; the filling tool comprises a filling casing pipe and a push rod casing pipe, and the tail end of the filling casing pipe and the tail end of the push rod casing pipe are provided with grab handles respectively; the front end of the push rod casing pipe and the near end of the injectable chain are designed to be of a tapper thread structure.When the device is operated, the top end of the filling casing pipe stretches into the lesion part, and the chain is filled into the damaged vertebra through the push rod casing pipe; bone cement is injected into the central through hole of the chain through the push rod casing pipe; the central through hole and the grooves are sequentially fully filled with the bone cement, solidification is performed to complete repairing, pressure exerting on the lesion part can be uniform and be reduced, and therefore the effect of effectively repairing the vertebra is achieved.The injectable vertebra repairing device is applied to the field of medical instruments and mainly used for achieving the purposes of stabilizing the fracture, recovering the vertebral mechanical strength and relieving pain.

The invention relates to a construction method of a built-in hollow steel fiber reinforced concrete protective layer, in which steel fiber hollowed steel fiber reinforced concrete is arranged on the outer side of a steel filled concrete structural column for protection; and the durability of the structural components is improved. The thickness 2f of the protective layer is not less than 70 mm. The wall thickness e2 of the thin-walled hollow steel pipe is not less than 5mm. The hollow steel pipe is in the middle of the protective layer. The protective layer is poured with steel fiber concrete. The amount of steel fiber added is 1-1.5% of the concrete volume. The 50mm round hole forms a hollow structure. The net spacing of the circular holes is the same as the diameter d, both are 50mm. Due to the anti-corrosion effect of steel fibers and the restraint effect of hollow steel pipes on the protective layer, the internal steel pipe concrete structural columns are protected in corrosive environments, and the hollow steel pipes also have auxiliary load-bearing capacity. It can be used in harsh environments with corrosive environments such as artificial islands, river courses, port projects, and offshore platforms.