905 results about "Shear resistance" patented technology

The invention belongs to the technical field of gate shaft construction, and particularly relates to a one-time forming pouring system and a one-time forming pouring method. The gate groove formwork and the vertical shaft sliding formwork assembly in the one-time forming pouring system can move in the depth direction of the gate shaft and jointly define a pouring ring, and when the strength of hydraulic concrete structures corresponding to the vertical shaft sliding formwork assembly and the gate groove formwork reaches the demolding strength, the gate groove formwork and the vertical shaft sliding formwork assembly are separated. The positions of the vertical shaft sliding formwork assembly and the gate groove formwork can be adjusted through the lifting device and the hoisting device, so that the pouring space rises in the depth direction of the gate shaft, continuous pouring of the hydraulic concrete structure is met, pouring of the hydraulic concrete structure does not need to be conducted step by step, joints are avoided, and the construction efficiency is improved. The integrity and shear strength of the hydraulic concrete structure are improved, so that the construction quality of the hydraulic concrete structure in the gate shaft is ensured, and meanwhile, the construction difficulty is reduced.

The invention provides a system and method for testing the shear resistance of an anchoring structural plane under water-force coupling, and the system comprises a prestress loading device which provides a prestress for an anchoring body sample, so that the structural plane is provided with a water flow channel with controllable opening degree; the shearing device is used for applying shearing force to the anchoring body sample to enable the structural surface to slide so as to damage the mortar protective layer; the high-pressure corrosion device is used for providing an osmotic pressure environment for the anchoring body sample so that a corrosion solution permeates into the structural surface to corrode the anchor cable, and the data acquisition device is used for monitoring sliding displacement, shearing force, pulling force, water pressure and ion concentration of the structural surface; the anchor cable corrosion damage coefficient calculation device is used for obtaining an anchor cable corrosion damage coefficient in the anchoring structure surface; the residual shear strength calculating device is used for obtaining the residual shear strength of the anchored structural surface after corrosion; and the anchoring body safety evaluation device is used for evaluating the safety state of the anchoring body. The method solves the problem of testing the residual shear strength of the anchoring structural surface considering the corrosion damage of the anchor cable under the synergistic effect of multiple factors.

Disclosed in the present application is a cast-in-place prefabricated building formwork component suitable for columns or beams, comprising a columnar formwork and stirrups fixed to the formwork; the upper and lower ends of the formwork are provided with connection fitting parts that fit adjacent formworks; the formwork is defined by steel plates; the stirrups are jointly formed by the steel plates and rod-shaped members fixedly connected to inner side surfaces of the steel plates. In addition, further disclosed in the present application are a cast-in-place prefabricated building shear wall component and a cast-in-place prefabricated building floor slab component. A stress test result proves that structures such as columns and beams formed by the cast-in-place prefabricated building formwork component in the present application can have a better constraint effect on concrete cast inside, and particularly increase a constraint area, thereby improving the overall shear resistance and bearing capacity of buildings, and having great significance for seismic resistance of the buildings in earthquakes.

The invention relates to a construction method and construction equipment for a high-pressure jet grouting pedestal pile. The construction method comprises the steps that S1, the equipment enters a site; s2, taking a fixed pile cylinder, and pressing the fixed pile cylinder to a bearing stratum at a pile position; s3, the soil body in the hollow part of the fixed pile cylinder is taken out; s4, jet grouting cutting or expanding cutting is carried out in the undisturbed soil body at the bottom of the fixed pile cylinder to form an expanded pit; s5, molded concrete is fed into the expanded pit in a pressed mode, the molded concrete is limited to upwelling in the hollow part of the fixed pile barrel, and cemented soil in the expanded pit is extruded into the undisturbed soil body on the peripheral side of the expanded pit and the gap between the fixed pile barrel and the pile hole; an expanding body, a lower surrounding body, a reinforcing body and an upper surrounding body are respectively formed; and S6, concrete is poured into the hollow part of the fixed pile cylinder to form a pile body. During construction, surrounding soil is basically not disturbed, noise is low, the pile can be exploded, the upper surrounding body and the lower surrounding body which are integrally solidified and formed wrap and protect the joint part between the pile body and the expansion body, and the anti-shearing capacity of the joint part of the pile body and the expansion body can be greatly improved.

An internal and external coupling shear resistance locking control system and monitoring method of tunnel surrounding rocks, comprises an internal shear resistance and monitoring system of tunnel surrounding rocks, an external shear resistance and monitoring system of tunnel surrounding rocks, a relative shear displacement monitoring system of the tunnel walls and the roof and floor layers, and an anchor agent installation system; holes are expanded in the anchor cable drilling holes passing through coal-rock interface areas of the coal walls and roof and floor rock layers to form shear misalignment tolerance cavities; monitoring pressure values of measuring bags and liquid discharge in the shear misalignment tolerance cavities to determine shear deformations of the shear misalignment tolerance cavities, monitoring forces on anchor cables, compensating pull rods and shear resistance steel strips, and adjusting the shear resistance of the anchor cable and steel belt through the compensation rod structure.

The invention discloses a gabion gabion net cage system for reinforcing a high-fill embankment of an expressway, belongs to the technical field of gabion gabion net cages, and solves the problems that in the prior art, external loads are resisted only through self-strength, and the gabion gabion net cage system and a filling body are difficult to form a synergistic deformation whole, so that the structure is cracked and fails. The system comprises an excavation roadbed, at least one group of filling slope foundations, gabion gabion gabion net cages and backfill discrete materials, according to the gabion gabion gabion grid net cage, through the synergistic effect of tensile resistance of the steel wire mesh and shear resistance of the block stones, the gabion gabion gabion grid net cage and the filling discrete material form a flexible-rigid composite structure, so that the high tensile property of the steel wire mesh can effectively restrain horizontal displacement and deep slippage of the filling material, and deformation of a side slope along a potential slippage face is restrained; and the gradation matching performance of the block stone filling structure and the backfill discrete materials enhances the occlusion effect between the materials, and the shear strength and the overall rigidity of the slope are remarkably improved.

The invention discloses an angle steel connecting piece shear strength prediction method and system based on a physical information neural network, electronic equipment and a storage medium thereof. The method comprises the following steps: establishing a database containing a plurality of groups of test data based on a numerical simulation result of an angle steel connecting piece finite element model verified by a push-out test; embedding an angle steel connecting piece shear bearing capacity physical constraint condition based on an elastic foundation beam theory into a loss function of the data-driven neural network model DNN; training the neural network embedded with the physical constraint condition by using a database, and adjusting and selecting a physical item weight factor and a model learning rate so as to construct a shear bearing capacity prediction model of a physical information neural network (PINN); predicting the shear strength of the angle steel connecting piece by using the trained physical information neural network (PINN) shear capacity prediction model; according to the prediction method and system, the electronic equipment and the storage medium thereof provided by the invention, the accuracy and reliability of the shear resistance prediction of the angle steel connecting piece can be improved.

The invention particularly discloses a rock-soil body interface torsional shear characteristic and toughness parameter unit body test device which comprises a unit body sample blank manufacturing device, a centering device, a special drilling tool, a rib body and a torque load.The rock-soil body interface torsional shear characteristic and toughness parameter unit body test device has the beneficial effects that traditional direct shear / drawing shear is replaced with torsional shear loading; the problem that the interface contact area is reduced in the shearing process is thoroughly solved, it is ensured that the interface contact area of an anchor / pile and a rock-soil body is constant, a pressure water bag is arranged at the top of a test box unit body, the original overlying and confining pressure environment of a stratum is accurately simulated, a test anchor hole / pile hole is directly manufactured through a drilling technology, and the natural roughness characteristic of the hole wall is reserved to the maximum extent; the smooth wall surface limitation of traditional mold pore forming is broken through, the basic toughness concept of the anchor / pile-rock-soil body interface is defined for the first time, the nature of the basic toughness can be quantitatively represented by the robustness of the shear resistance of the interface, a matched toughness testing technology and evaluation method are developed, and a theoretical model and a calculation tool are provided for the toughness design of anchoring engineering and pile foundation engineering.

The invention discloses a method for evaluating damage evolution of an underground structure under the action of a sudden explosion load, and relates to the technical field of civil engineering and engineering disaster prevention, and the method is characterized by comprising the following steps: S1, simulating the underground structure based on an explosion load, a geometric boundary and material parameters, and constructing a unified constitutive model; and S2, introducing a pressure-related strength criterion of a Dwark-Prasugrel criterion into the unified constitutive model so as to describe the influence of confining pressure on the shear strength. The technical problem to be solved by the invention is to provide the method for evaluating the damage evolution of the underground structure under the action of the burst explosion load, so that the key pain points such as pressure correlation, high strain rate effect, material random discreteness, damage softening energy consistency and the like are difficult to consider at the same time in the existing analysis method. A set of damage evolution evaluation method and implementation system which can be implemented from the material level to the structure level is established, and quantitative prediction and engineering grading judgment of the whole process of crack initiation, expansion to instability failure of the underground structure are supported.

The invention belongs to the technical field of mining construction, and particularly relates to an artificial roof structure and a construction process thereof. The construction process comprises the steps that S1, anchor rod holes are constructed in the positions, 1 m away from a bottom plate, of two sides of a stope, S2, ore cushion layers with the thickness of 200 mm are laid and leveled, S3, I-shaped steel bottom beams are erected and fixed through round steel anchoring parts and welding base plates, S4, a reinforcing mesh is laid, main ribs and auxiliary ribs are bound in a crossed mode and welded to anchor rods, according to the composite structure design of the double-layer reinforcing mesh, the steel wire mesh and the hanging bar system, a three-dimensional stress system is formed, the bending resistance and the shearing resistance of the false roof are remarkably improved, the problem that a traditional false roof is prone to cracking and sinking is solved, and the false roof has the advantages of being simple in structure, convenient to use, economical and practical. Due to the layered matching design of the full-tailing cemented filling body, the bearing strength is guaranteed, seamless roof contact is achieved, the risk of roof hollowing is reduced, the pressure of stope operation circulation is relieved, the ore removal efficiency is improved, and the mining cost is reduced.

The present invention discloses a low-temperature resistant perfluoroether rubber and a preparation method thereof. In parts by weight, the raw material components include: 80-120 parts of perfluoroether rubber polymer, 1-5 parts of additives, 10-30 parts of fillers, 1-3 parts of cross-linking agents, 1-4 parts of accelerators, 1-3 parts of processing aids, and 1-3 parts of acid absorbers. The present invention prepares a perfluoroether rubber polymer by a two-step polymerization method, and then prepares a low-temperature resistant perfluoroether rubber by mixing the perfluoroether rubber polymer with all mixed auxiliary materials. The perfluoroether rubber provided by the present invention not only has higher hardness, tensile strength, anti-extrusion deformation, shear resistance and low-temperature resistance, can meet the use demand of perfluoroether rubber at 40°C, and also has excellent plasma etching resistance, and can be applied to the semiconductor industry.

The invention discloses a prefabricated shear wall, a building module, a modular building system and an assembly method. The prefabricated shear wall comprises a wall body, at least two steel pipes and at least two bearing grooves. The wall body is used for being vertically placed, the steel pipes are embedded in the wall body, the steel pipes vertically extend and are spaced in the horizontal direction, and the steel pipes downwards extend out of the wall body by a preset length. The bearing grooves are formed in the wall body, the bearing grooves and the steel pipes are correspondingly arranged in the height direction of the wall body, the bearing grooves are located above the corresponding steel pipes, and openings of the bearing grooves face upwards and vertically extend downwards by a preset depth. The prefabricated shear wall can be prefabricated in a factory and cast-in-place, connected and fixed, operation is easy, and the building efficiency is high. The prefabricated shear wall can be stacked up and down for construction, the upper-layer wall body and the lower-layer wall body are connected through the steel pipes, compared with traditional steel bar connection, higher shear resistance is provided for a building structure, and the requirement for modular or fabricated construction of a super high-rise building can be met.

The invention discloses a magnet structure based on the mortise and tenon principle and an assembling method, the magnet structure comprises magnets, a plurality of magnets are connected end to end to form a ring, and mortise and tenon connection sections are processed at the head and tail ends of the magnets; when every two magnets in the tenon-and-mortise connection section are connected end to end, mechanical interlocking can be formed by assembling according to the tenon-and-mortise principle and meshing assembling between the grooves and the bosses, so that the stability of the magnets is greatly improved, and the assembling efficiency is improved. The overall mechanical stability is effectively improved, and the anti-shearing force is improved by about 18.7% through the mortise and tenon joint structure (compared with plane structure bonding). The magnetic performance is that the surface magnetic field of the magnetic ring assembled by the tenon-and-mortise structure is almost unchanged (compared with plane structure bonding). And the qualified rate of the product is increased to 90% from the original 50% in the process of producing, manufacturing and processing the magnetic ring.

The invention relates to the technical field of embankment reinforcing and widening, and provides an embankment widening construction method based on biomineralization and reinforcement cooperation. The microcosmic cementation effect of calcium carbonate precipitation in the inclusion is induced by the enzyme and is combined with the macroscopic constraint of the geogrid, so that a friction-cementation composite interface is formed, and the shear resistance and impermeability of the new and old roadbed combined surface are greatly improved. Meanwhile, the synergistic enhancement transition area serves as a rigidity coordination layer, loads can be effectively homogenized, differential deformation can be effectively absorbed, and therefore differential settlement is restrained, and reflection cracks are prevented. According to the method, the microcosmic cementation strengthening capacity of enzyme-induced calcium carbonate precipitation and the macroscopic reinforcement restraining capacity of the geotechnical reinforcement material are subjected to space coupling and function cooperation, the weak area of the widened embankment is fundamentally improved, and the integrity and long-term stability of the widened embankment are remarkably improved.

The invention discloses an automatic assembly method and an automatic assembly line for a high-shear-resistance rivet. The automatic assembly method comprises the following steps that S1, a core rod feeding unit is started; s2, a ring feeding unit is started; s3, a rivet body feeding and tightening unit is started; s4, product detection; and S5, a finished product discharging unit is started, a discharging mechanical arm is used for clamping the qualified high-shear-resistance rivet products and placing the qualified high-shear-resistance rivet products in a collecting material frame, the products are manually taken away after the collecting material frame is full, and automatic assembling of the high-shear-resistance rivet products is completed. According to the automatic assembly method and the automatic assembly line, the intelligent assembly technology is applied, the automatic design and the PLC automatic control technology are adopted, high-shear-resistance rivet product assembly automation is achieved, manual production is replaced with automatic equipment, the productivity utilization rate of existing equipment is effectively increased, the labor condition is improved, and the production efficiency is improved. The labor intensity is reduced, the stability and consistency of the product assembly quality are improved, the product production efficiency is improved, and the requirement for high-quality delivery of products is met.

The invention provides high-toughness chitosan hydrogel and a preparation method thereof, and belongs to the technical field of chitosan materials. Under a specific electric field driving condition, a chitosan solution realizes molecular chain oriented migration and in-situ deposition in an acid environment, and a three-dimensional network with dense arrangement and a gradient structure is constructed. The chitosan hydrogel disclosed by the invention has excellent performance in the aspects of tensile strength, elongation at break, toughness, shear resistance and the like which exceed those of chitosan hydrogel prepared by most methods, and has good biocompatibility and application potential. The programmable regulation and control of the structure and performance of the chitosan hydrogel can be realized by regulating and controlling the pH value, the electric field intensity, the current density, the deposition time and the like of the system. The high-toughness chitosan hydrogel prepared by the method is suitable for various biomedical scenes, such as bionic soft tissues, bone repair scaffolds, flexible electronic devices and other wet application scenes with high mechanical property requirements.

The invention discloses a method for calculating the shear strength of a weak structural plane based on a Barton formula, and relates to the field of shear strength calculation, and the method comprises the following steps: introducing a reduction coefficient into a traditional Barton formula, and constructing an improved Barton formula; the shear strength of the weak structural plane is calculated through an improved Barton formula; the improved calculation model is regressed into an original Barton formula when no filler exists, theoretical continuity is guaranteed, compatibility with a traditional model is achieved, meanwhile, the defects of the traditional model are well overcome, and an important theoretical basis is provided for prediction of the shear strength of the weak structural plane. An improved Barton formula is utilized, the weakening effect of the soft filler on the rock mass structural surface can be reflected, the relation between the thickness of the soft filler and rock wall roughness attenuation can be accurately quantified, and compatibility with a traditional model is achieved; and the applicability, reliability and precision of prediction of the shear strength of the weak structural plane are effectively improved.

To provide an anchoring structure between a non-ferrous reinforcement of a cast-in-place wall balustrade and a floor slab, which has required shear resistance at a joint portion, which prevents stress from concentrating on a bent portion, and which achieves dynamically efficient bar arrangement.SOLUTION: In an anchoring structure between a non-ferrous reinforcement of a cast-in-place wall balustrade 2 and a floor slab (PC floor slab 2), the non-ferrous reinforcement has a diameter equal to or larger than a nominal diameter of a reinforcing bar required in structural design, a bending inner radius of the non-ferrous reinforcement is 2.5 times or more of the bending inner radius of the reinforcing bar, and an anchoring length of the non-ferrous reinforcement is 12 times or more of a diameter of the non-ferrous reinforcement.SELECTED DRAWING: Figure 1

The invention relates to the field of buildings, and discloses a prefabricated pipe pile stand column steel supporting node and a construction method thereof.The prefabricated pipe pile stand column steel supporting node comprises a prefabricated pipe pile stand column, a pile head is arranged at the top of the prefabricated pipe pile stand column, a micro-expansion concrete filling core is arranged in the prefabricated pipe pile stand column, and the bottom end of the micro-expansion concrete filling core is fixedly connected with a round thin steel plate through anchor bars; the top ends of the anchor bars are fixedly connected with anchor plates, overflow holes are formed in the anchor plates, and the top faces of the anchor plates are exposed out of the pile head. Longitudinal steel reinforcement frameworks and transverse stirrups are arranged in the pile head to form a steel reinforcement mesh cage, a micro-expansion concrete filling core is poured by adopting a layered pouring and layered vibrating process, and end hook type steel fibers are doped, so that concrete shrinkage can be compensated, cracks are inhibited, and meanwhile, the bending strength and the shearing strength of the pile head are enhanced; and the load of the steel support can be uniformly transmitted to the prefabricated tubular pile stand column through the anchor plate, so that the node has reliable bearing capacity and crack resistance.

The invention discloses a slope structural surface roughness coefficient testing method. The method comprises the core steps of structural surface pretreatment, rebound detection, contour curve drawing, roughness measurement and the like. Measuring areas are divided and identified, an average rebound value is obtained by using a rebound apparatus, a surface profile is drawn in combination with a profile curvimeter, and a roughness coefficient JRCn is read by using a multi-range roughness ruler and an electronic subdivision technology; in addition, parameters such as rock wall strength and normal stress can be obtained through a point load instrument, a vibrating wire strain gauge and the like, shear strength is calculated in combination with a Barton-Bandis mode, data of multiple measuring areas are integrated, and dynamic correction results of environmental parameters are associated. According to the method, the test precision and efficiency are improved, data integration and full-period management are realized, and a reliable basis is provided for slope stability evaluation.

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a method for testing the degradation characteristic of the bearing performance of a recyclable anchor rod under cyclic loading. The method comprises the following steps: preparing a unit body sample anchor-rock interface unit body sample, simulating weathered soft rock according to a specific ratio, pouring a self-compacting concrete anchoring body, and curing and forming; setting a combined parameter of a reference load ratio and a load cycle index, applying a triangular wave cyclic load to simulate a traffic condition, and executing a pull-out test to collect load-displacement data; constructing a two-parameter coupled shear strength degradation model based on test data, and proposing a shear stress-displacement curve model; an anchor rod load transfer control equation is established in combination with the Poisson effect, and shear stress distribution of the anchoring section is iteratively solved by adopting a discrete recursion method; the model is verified through a foundation pit engineering case, the ultimate bearing capacity degradation law of the anchor rod under long-term cyclic loading is predicted, and it is proved that the model can guide engineering safety design. According to the method, the coupling characterization of the cyclic load parameter and the interface degradation mechanism is realized.

The invention relates to a UHPC-NC interface mechanical property prediction method and system considering a size effect, and the method comprises the steps: preparing a target test piece, collecting original data through a direct shear test and a pull-out test, and obtaining a shear stress-displacement curve and a tensile stress-displacement curve according to the original data; extracting shear performance parameters and a linear relation according to the curve, carrying out fitting analysis on the shear performance parameters to obtain a shear size effect law, further defining a shear macroscopic constitutive model, and carrying out fracture mechanical quantitative evaluation on the shear performance parameters to obtain a shear macroscopic constitutive model. Deriving and constructing a prediction expression of shear resistance and a shear-displacement constitutive model according to a quantitative evaluation result; extracting tensile property parameters according to the curve, performing series analysis on the tensile property parameters to obtain an interface tensile relationship, performing probability distribution analysis on the tensile property parameters to obtain a tensile size effect law, and performing derivation according to the interface tensile relationship and the tensile size effect law to obtain a tensile property prediction expression and a tensile-fracture constitutive model.

The invention relates to the technical field of lubricating grease, in particular to RV speed reducer lubricating grease. The RV speed reducer lubricating grease prepared by the invention has excellent low friction coefficient, high conduction efficiency, low running temperature rise, load resistance, low-temperature fluidity, startability, shear resistance and protective property. The RV speed reducer lubricating grease plays a crucial role in the service life of grease and the lubrication protection of all transmission parts in a speed reducer, provides a powerful guarantee for prolonging the service life of the RV speed reducer, and has a wide application prospect.

The invention discloses an anchor rod or anchor cable mounting device and method for inhibiting failure of an anchoring interface, and relates to the technical field of roadway supporting. The device comprises an annular body, a conical protrusion structure, a pulse press-in device, a fluid flushing system and a guide stabilizer, and is suitable for various hole diameters and different surrounding rock types. The construction method using the device comprises the following steps: drilling a hole by a drilling machine to mount an anchor rod or an anchor cable, evaluating the drilling hole, determining a test environment and boundary conditions, performing a drilling hole compression test to simulate confining pressure to obtain a stress deformation response curve, and determining the bonding performance and the shear strength through a pull-out test. The size of the conical protrusion is determined by combining lithology and crustal stress characteristics, the device is installed to a drilling target section, the pulse pressing-in device is started, the conical protrusion structure is pressed into the hole wall of a drilling hole to form a continuous groove, and when a fluid washing system is started to remove dust and chippings, a guiding stabilizer is connected, so that the drilling target section is formed. It is ensured that the device retreats from a drill hole at a constant speed, cleaning operation in the hole is completed, and finally the prefabricated anchor rod is inserted to form a high-adhesion and high-shear-resistance complete anchoring structure.

The utility model relates to the technical field of building construction, and discloses a prefabricated laminated slab inter-slab abutted seam structure which comprises prefabricated slabs, the top of the right side of the prefabricated slab on the left side is fixedly connected with a plurality of through reinforcing steel bars, the outer walls of the through reinforcing steel bars are provided with locking reinforcing steel bars, and the right side of the top of each prefabricated slab is fixedly connected with a plurality of hoisting reinforcing steel bars. The top of the hoisting steel bar is fixedly connected with a steel bar sleeve, the inner wall of the steel bar sleeve is fixedly connected with a butt joint steel bar, and the edge of the right side of the top of the prefabricated slab is fixedly connected with a plurality of stabilizing steel bars. According to the utility model, the reinforcing steel bars are hoisted to fix the prefabricated slab, the through reinforcing steel bars are distributed at the abutted seams, the concrete mixed liquid is uniformly poured by using a fine aggregate concrete pump, the reinforcing steel bars and the reinforcing steel bar sleeves are locked to be inserted with the butt-joint reinforcing steel bars, the reinforcing steel bars are stabilized to increase the connection area, and the inclined plane of the prefabricated slab forms an inverted V-shaped space and is provided with tooth grooves, so that the shear strength, integrity and durability of the structure are enhanced; and requirements are met.

The invention relates to the technical field of brake pads, in particular to a brake pad adaptive to a carbon-ceramic brake disc and a preparation process thereof.The brake pad comprises, by weight, 25%-57% of reinforced fibers, 22%-49% of a lubricant, 7%-17% of a binder, 7.2%-28.1% of a friction modifier and 3%-23% of filler; the reinforced fiber is at least one of nano silicon nitride modified ceramic fiber, carbon fiber and aramid fiber. Through cooperation of the components, the prepared brake pad has the advantages of being good in heat conduction, resistant to shearing and abrasion, good in toughness, capable of reducing noise, stable in friction coefficient, reliable at low temperature, high in high-temperature braking force, stable in braking and the like.

The invention discloses motor controller circuit board manufacturing and processing equipment, and belongs to the field of circuit board manufacturing and processing. The electric track is assembled on the top of the base; the air exhaust assembly is assembled on the top of the base; the electric sliding block is assembled on the inner wall of the electric track; the heating cover is assembled at the bottom of the electric sliding block; an elastic telescopic rod is assembled at the top of the electric sliding block, a pressing plate is fixedly connected to the bottom of the elastic telescopic rod, and a moving block is slidably connected to the bottom of the inner wall of the base. Through the synergistic effect of the electric sliding block, the elastic telescopic rod, the pressing plate and other structures, it is ensured that the pressing plate evenly applies pressure to the circuit board at the downward pressing moment, the problems of small interlayer friction force and poor shearing force resistance are solved, therefore, movement of the top layer circuit board is avoided, it is ensured that prepregs can be fully melted before being heated, even heating of resin is ensured, and the service life of the circuit board is prolonged. And the production efficiency and the quality of the circuit board are improved.

The invention provides a rapid evaluation method for shear strength of a rock structural plane under normal disturbance, and belongs to the technical field of geotechnical engineering and rock mechanics, the method comprises the following steps: S1, sample preparation and initial parameter acquisition; s2, normal disturbance direct shear test; s3, fitting test data and establishing an empirical model; and S4, rapidly evaluating the shear strength. According to the method, by introducing a normal disturbance stress parameter, an empirical calculation formula capable of rapidly predicting the shear strength after disturbance is established, and key parameters are provided for engineering design and stability analysis.

The invention discloses a hybrid control method and device for a shear strength test of a rock mass structural plane, and relates to the technical field of physical property analys.The hybrid control method comprises the steps that the stress accumulation state before shear failure is simulated by controlling shear force to be increased or kept according to a preset function relation; judging whether a first condition for converting from the first mode to the second mode is met or not in real time, switching to the second mode when the first condition is met, controlling the position of the sample to remain unchanged, and simulating a stress release state during shear failure; judging whether a second condition for converting from the second mode to the third mode is met or not in real time; when a second condition is met, switching to a third mode, controlling the sample to slide at a constant rate, and simulating a stress retention state after shear failure; and when the accumulated slippage distance of the sample reaches a preset limit value, ending the test. According to the method, full-stage mechanical behaviors from the moment before damage to the moment after damage are reproduced, and accurate data support is provided for slope stability analysis and anti-sliding design.

The invention provides a super-smooth antifouling surface with photo-thermal self-repairing performance as well as a preparation method and application of the super-smooth antifouling surface. The super-lubricity antifouling surface comprises a light response substrate and a lubricating layer formed on the light response substrate. Wherein the photoresponse substrate can trigger the photothermal conversion performance under the irradiation of near-infrared light, so that the temperature of the super-lubricity antifouling surface is rapidly increased, polyethylene wax and C12-C16 long-chain alkane in the lubricating layer can be in a molten state, the position, with defects, of the surface of coastal or marine common mechanical equipment is filled up, and after cooling, the surface of the mechanical equipment is not damaged. And a self-repairing function is realized. Compared with the prior art, by compounding the polyethylene wax and the C12-C16 long-chain alkane, a novel solid-state phase-change super-smooth surface can be provided, the stability and the antifouling property of the super-smooth antifouling surface are remarkably improved, and the problem that the antifouling property fails due to the fact that a traditional liquid-state super-smooth surface lubricating layer is poor in shear resistance is remarkably solved.