381 results about "Large deformation" patented technology

The embodiment of the invention relates to the technical field of data modeling analysis, and discloses a tunnel rock stratum large deformation analysis method and system based on three-dimensional modeling, and the method comprises the steps: collecting initial three-dimensional point cloud data through three-dimensional laser scanning; constructing an initial three-dimensional geologic model containing spatial morphological characteristics and a rock stratum interface geometric topological relation through space coordinate matching and curved surface reconstruction; finite element unstructured mesh generation is carried out on the model, and a rock stratum mechanical analysis model is established in combination with physical and mechanical parameters; inputting construction parameters and process information, activating unit nodes in sequence, and solving a force balance equation to simulate stress distribution; identifying a potential deformation area through iterative calculation, and adjusting boundary conditions to predict a deformation trend; the three-dimensional space distribution cloud atlas, the time evolution curve and the position marks are fused to generate multi-view deformation early warning information, the accuracy and the visualization degree of tunnel rock stratum deformation analysis are improved, and support is provided for construction safety.

The invention discloses a tunnel construction method for a large deformation section of soft rock, and relates to the technical field of tunnel construction for the large deformation section of the soft rock, and the tunnel construction method for the large deformation section of the soft rock comprises the following steps: drilling shallow large-aperture stress release holes and deep small-aperture stress release holes to form a layered release system; differential pressure grouting is conducted around the stress release holes, and a deep reinforcing ring and a shallow coupling ring are formed; a steel frame is erected, and a three-stage stretching locking bottom supporting assembly is installed to form a closed supporting ring; the bottoms of the adjacent steel frames are crossly connected through prestressed pull rods to form an integral rigid grid; a secondary lining is constructed after the longitudinal attenuation conduction period is judged according to the surrounding rock deformation spatial-temporal characteristics; inverted arch first and then arch wall segmented pouring is adopted, and a delayed expanding agent is doped into arch wall concrete. The method can effectively control surrounding rock deformation in the tunnel construction process of the large deformation section of the soft rock, improves the overall rigidity and stability of a supporting system, ensures that the lining is tightly attached to the surrounding rock, and reduces the construction risk.

The invention discloses an invasion limit surrounding rock excavation method for a large deformation section of soft rock, and relates to the technical field of invasion limit surrounding rock excavation construction for the large deformation section of the soft rock. The invasion limit surrounding rock excavation method for the large deformation section of the soft rock comprises the steps that refined partitioning of an invasion limit body is achieved through dense scanning and loose circle testing; dividing the invasion limiting body into a core pressure-bearing area and a peripheral stress relaxation area; a main stress diversion arch crossing an invasion limit section is constructed through full-ring radial grouting reinforcement and erection of a strong profile steel temporary cover arch, and effective stress transfer is achieved; the mode of subarea gradual type dismantling and chiseling and instant supporting is adopted, a peripheral stress relaxation area is treated firstly, then a core pressure-bearing area is treated, and surrounding rock disturbance is reduced; the circumferential stress equalization is realized by compensating grouting in stages and dynamically adjusting the grouting pressure according to real-time monitoring data. According to the method, the excavation construction safety of the invasion limit surrounding rock of the large deformation section of the soft rock can be improved, surrounding rock disturbance is reduced, stress distribution is optimized, and the treatment efficiency of the invasion limit surrounding rock is improved.

The invention discloses a soft rock waterproof layer construction method for a soft rock large-deformation section tunnel, and relates to the technical field of soft rock waterproof layer construction of the soft rock large-deformation section tunnel. The construction method of the soft rock waterproof layer for the tunnel at the large deformation section of the soft rock comprises the steps that a sprayed concrete layer is constructed, a full-ring-shaped steel arch frame is erected, system anchor rods are constructed, concrete is sprayed again after full-length grouting is conducted, and a primary supporting layer containing a grouting reinforcing ring is formed; locking anchor pipe grouting is carried out on the arch springing part to form a local reinforced waterproof bearing body; based on deformation monitoring data, dynamic judgment is carried out, and radial reinforcing grouting is carried out on the obvious deformation part; and after deformation is stable, a waterproof layer is laid, a secondary lining is poured, and a composite waterproof system is formed. The waterproof reliability and the structural durability of the soft rock waterproof layer of the tunnel at the large deformation section of the soft rock can be improved.

The preparation method of the A1-grade nondestructive inspection high-impact-toughness TC4 titanium alloy large-size bar comprises the steps that a secondary finished product cast ingot is subjected to a multi-heating-number high-temperature single-phase beta-region large-deformation forging process in the cogging stage, and as-cast grains are fully crushed and refined in the modes of axial upsetting, lateral upsetting, diagonal upsetting and the like; then, high-low-high-low repeated forging is conducted at the temperature above and below the phase transformation point, grain homogenization is achieved through high-temperature dynamic recrystallization, an original grain boundary is eliminated, and deformation dead zones of a corner angle area are effectively reduced in combination with multi-heating-number diagonal drawing-out forging; and finally, multi-heating-number forging is conducted in the two-phase region, a heat treatment process is combined, the microstructure form is further optimized, and a lamellar alpha structure is controlled to guarantee the low-temperature impact performance. According to the method, the structure uniformity of the TC4 alloy bar can be remarkably improved, the A1-level nondestructive testing requirement is met, and the method has excellent axial and chordwise mechanical properties and is suitable for ocean equipment and other high-end application fields with strict requirements for the comprehensive performance of materials.

The invention discloses a deep learning-based large deformation prediction method for a high ground stress soft rock tunnel, and belongs to the field of tunnel engineering geological disaster prediction. By constructing a double-branch network architecture of'geological mode identification-deep learning prediction ', accurate prediction of large deformation of the tunnel is realized. The method comprises the following steps: firstly, collecting six qualitative indexes such as a rock mass structure, a weathering degree and an underground water condition and three quantitative indexes such as a strength-stress ratio, support rigidity and an equivalent hole diameter, performing encoding and normalization preprocessing, and respectively inputting the indexes into an upper-layer network and a lower-layer network; outputting probability distribution of six types of modes prone to large deformation, such as a weak homogeneous type mode and a block crack structure type mode; and the lower layer predicts the deformation and divides risk levels through a full-connection neural network based on the geological mode identification result and the quantitative index. According to the method, the complex coupling mechanism of large deformation of the high-crustal-stress soft rock tunnel can be fully reflected; adaptability prediction is realized for different geological modes.

The invention discloses a side face direct-insertion wiring terminal block structure and an elastic piece simulation design method of the side face direct-insertion wiring terminal block structure. Comprising an insulating shell, a conducting strip, a first elastic piece, a second elastic piece and a push block abutting against the elastic pieces, a wire can be inserted along the side face and clamped by a wire clamping block, and electricity conduction and disengagement prevention are achieved; the elastic piece is made of a metal material with resilience, and the elastic piece is bent to form a mounting part and a camber beam structure so as to provide stable clamping force. In order to optimize the performance of the elastic sheet, a simulation design method is adopted to establish an elastic sheet finite element model, set material attributes and constraint and loading conditions, carry out mesh refinement on a bending area and a wire clamping opening, start large deformation analysis and draw a force-displacement curve, so that the equivalent stiffness, the maximum stress and the deformation of the elastic sheet are obtained. Through simulation comparison of different design schemes, the optimal structure meeting the strength and resilience requirements can be determined. According to the invention, the stable conduction of the side plugging terminal and the predictable design of the performance of the elastic sheet are realized, and the assembly reliability and the design efficiency are improved.

The invention provides a grouting support reinforcement method and system for a gob-side entry retaining large-deformation roadway, and relates to the technical field of coal mine roadway surrounding rock control and grouting reinforcement. According to the method, mining-induced stress and deformation characteristics are analyzed by constructing a numerical simulation model, a plastic zone range is recorded in combination with a monitoring section, and a reinforcement area and grouting opportunity are determined based on dynamic weight evaluation; and according to the height of the plastic zone and the integrity of the surrounding rock, the drill hole arrangement is designed in a self-adaptive mode, the grouting pressure and the grout dosage are calculated, the termination condition is controlled according to the pressure and flow change in the grouting process, and accurate and reliable reinforcement of the large-deformation roadway surrounding rock is achieved.

The invention discloses a nine-axis linkage intelligent welding process optimization method based on analogue simulation and digital twinning. An existing welding process mostly depends on artificial experience and single equipment control, and an integrated processing system of simulation prediction, equipment cooperation, virtual-real linkage and iterative optimization is lacked. According to the nine-axis linkage intelligent welding process optimization method, a platform is built based on simulation software, after a three-dimensional model of a to-be-welded component is built, the three-dimensional model of the to-be-welded component is subjected to multi-physics field coupling simulation processing to obtain welding data, the welding data is input into an AI multi-target optimization algorithm to form a simulation data training model, and the simulation data training model is used for training the to-be-welded component. Screening according to the simulation data training model to obtain a processing process of an optimal welding sequence and process parameters; through deep integration of intelligent equipment integration, technological process simulation optimization and digital twin control, the problems of low efficiency, poor quality and large deformation in a traditional manufacturing mode are systematically solved.

The present application relates to a kind of large section deep soft rock tunnel combined support system and construction method, the present application is combined with elastic shell theory and equivalent section method, a steel arch frame-grating combined support mode suitable for deep large section soft rock tunnel is proposed, the support rigidity of simply using steel arch frame or grid steel frame is overcome or supported, the disadvantage of lower in long-term large deformation unfavorable surrounding rock stability and deformation control, solve the problem that the stress of existing support structure is larger, the self-bearing capacity of surrounding rock cannot be fully exerted, cause material waste is serious, the safety factor of support structure is low, difficult to guarantee the stability of tunnel, and provide a simple and practical construction method for tunnel excavation and support.

The application belongs to the technical field of aircraft assembly design, and particularly relates to an aircraft fuselage assembly method, which realizes the arrangement of corresponding measurement stations, measurement reference points and object measurement points of each small wallboard, and the pre-positioning, pre-coordination, posture adjustment and secondary coordination of each small wallboard through the space outward deviation of the theoretical assembly positions of the upper, lower, left and right long strip wallboards, and can well eliminate the problem of large deformation in the assembly process of the four long strip wallboards with weak rigidity, has high assembly precision and efficiency, and can well guarantee the aerodynamic performance of the aircraft fuselage assembly.

The invention discloses a synchronous bidirectional coupling solving method for large deformation of a flexible slender beam under uniformly distributed pressure based on an accurate load stiffness matrix, and relates to the field of computational mechanics. According to the method, a local curve coordinate system and a uniformly distributed pressure vector function are constructed through an absolute node coordinate Euler-Bernoulli beam unit discrete beam structure, a unit external force vector is derived based on a virtual work principle, and a precise load stiffness matrix is obtained through a vector value function differential rule. The load stiffness matrix and the elastic tangent stiffness matrix are synchronously assembled in the Newton-Rafson iteration step, and synchronous bidirectional coupling solution of the load and the configuration is achieved. According to the method, the numerical value loading limit of a traditional method is broken through, error accumulation is avoided, the calculation stability and precision are improved, the large deformation and even post-buckling behavior of the flexible slender beam under the uniformly distributed pressure can be accurately analyzed, and the method is suitable for design optimization of related equipment in the fields of ocean engineering, mechanical engineering and the like.

The present application belongs to the technical field of low-frequency vibration control, and aims at the problem that the traditional tuned mass damper is limited in vertical space use due to the excessive spring net deformation under low-frequency conditions, and provides a low-frequency tuned mass damper device which reversely stretches the compression spring. The device fully realizes the compression large deformation and reverse stretching deformation of the spring in the limited vertical space through the way of over-compression and reverse stretching of the compression spring, so as to achieve the required low stiffness of the vibration system. The low-frequency tuning can be realized in the limited vertical space of the bridge girder, and the frequency application range of the tuned mass device is greatly expanded. At the same time, the stability problem of the traditional compression spring mass body placed on the spring and the problem of excessive and unstable damping caused by the increase of the guide component are avoided. The device has simple structure, low damping, low space requirement and good stability, and can be applied to vertical, lateral and torsional multi-type low-frequency vibration control of various engineering structures.

This invention discloses an integrated forming mold and process for high-efficiency forming and toughening of cylindrical parts. The integrated forming mold includes a lower mold that rotates synchronously with a lower turntable to twist and form the bottom end of the blank; a lower floating mold, the top surface of which is flush with or below the top surface of the lower mold; embossing rollers and flattening rollers, respectively, for embossing and flattening the outer surface of the blank; an upper mold movably connected to the bottom of an upper turntable, rotating synchronously with the upper turntable to roll or twist and form the top end of the blank; an upper floating mold, the bottom surface of which is flush with or above the bottom surface of the upper mold; and an upper turntable, which provides downward pressure to the upper mold and drives its rotation. This invention achieves large deformation to obtain a fine-grained structure while effectively reducing the forming load and realizing integrated toughening forming. Furthermore, the hydraulic device drives the mold to change the forming mode and controls the execution of the motion mechanism, facilitating automated control and greatly simplifying the process flow.

This invention provides a hyperelastic flexible structure, forming tooling, and a method for fabricating the hyperelastic flexible structure. The hyperelastic flexible structure includes a first helical wire, a second helical wire, and welded mass microspheres. The length direction of the first helical wire is orthogonal to the length direction of the second helical wire. The welded mass microspheres are positioned at the intersection of the first and second helical wires to connect them. This invention connects the orthogonally arranged first and second helical wires with welded mass microspheres to form a hyperelastic flexible structure. Compared to existing hyperelastic structural materials, it possesses excellent multifunctional mechanical properties such as large deformation recovery elastic deformation and zero Poisson's ratio. It can be used as a skeletal reinforcement for novel multiphase composite hyperelastic structural materials or as a standalone component.

The application discloses a large-span steel structure and a metal roof integrated construction method thereof, and mainly comprises the following steps: (1) arranging assembling jigs and fulcrums at boundary positions on an assembling operation surface according to the construction partition, design boundary and assembling requirement of the large-span steel structure; (2) completing the assembling construction of the large-span steel structure on the assembling jigs; (3) reserving part of the assembling jig fulcrums near the original support boundary of the large-span steel structure and unloading the rest of the assembling jig fulcrums; (4) completing the metal roof system installation operation on the unloaded steel structure; (5) installing corresponding lifting or hoisting construction measures; (6) integrally lifting or hoisting and positioning; (7) fixing the large-span steel structure and the metal roof on a supporting structure; and (8) integrally unloading and completing the construction. The application solves the defects of the existing steel structure and metal roof integrated construction, can avoid the excessive deformation of the metal roof in the integrated construction process, is safe and controllable, and significantly improves the construction quality.

This invention relates to the field of titanium alloy material preparation technology, and particularly to a multi-pass forming process for TC11 titanium alloy, comprising the following steps: Step 1, preparing titanium alloy bars; Step 2, heating the titanium alloy bars to 950℃ at a heating rate of 5℃ / s; Step 3, after reaching the set temperature, holding the titanium alloy bars at that temperature for 300 s to fully eliminate the temperature gradient inside the sample; Step 4, performing three compression deformations on the titanium alloy bars using a press, with a strain rate of 10 s. ‑1 The maximum deformation is 70%; a 10-second isothermal interval is set between each two compression passes; in step five, after deformation, rapid cooling is immediately achieved using water quenching. This invention achieves the technical goal of optimizing the hot forming process of titanium alloys and producing high-performance titanium alloy products.

This utility model discloses a novel anchor bolt suitable for layered soft rock tunnels with different large deformation levels, relating to the field of soft rock tunnel support technology. It includes a first rod body, a second rod body, and an extension mechanism. The extension mechanism is disposed between the second rod body and the first rod body. The end of the first rod body is connected to an end cap, and a pad is disposed between the end cap and the first rod body. This utility model employs the aforementioned novel anchor bolt suitable for layered soft rock tunnels with different large deformation levels. The arrangement of the first and second rod bodies enhances the stability of the anchor bolt, resulting in more stable bonding anchoring force and higher pull-out resistance compared to simple metal anchor bolts, while also adapting to complex working conditions. The extension mechanism addresses the issue of easy deformation in soft rock, better utilizing the anchor bolt's support function. The material of the second rod body provides excellent adhesion and corrosion resistance, forming a high-strength anchoring interface, and its connection with the extension device enhances the stability of the device.

The present application relates to a kind of multi-point friction anti-slide anchor cable, including anchor cable body, anchor cable body includes mutually connected anchoring section and free section, anchor cable body is installed in slope with inclination, anchoring section is anchored in the bottom stable bedrock of the slide bed of slope, free section is provided with multiple equidistantly arranged friction blocks, and friction block is in friction contact with slide body.The beneficial effects of the present application are that excellent anti-sliding performance for the slope can be achieved without rigid support structure, the spatial form of the slope slip surface can be changed, the self-bearing capacity of the rock-soil body can be fully utilized, a more stable structure is formed through the interaction between the anchor cable and the rock-soil body, the overall structure is simple and reliable, fault-tolerant, and can be applied to the prevention and control of large deformation slope, while reducing the amount of work and reducing construction cost, the construction safety can be improved.

The invention discloses a tunnel expansion section construction supporting structure and a construction method, and relates to the technical field of tunnel supporting structures.The tunnel expansion section construction supporting structure comprises a supporting frame, supporting bases are rotationally installed on the two sides of the supporting frame, and a supporting plate is fixedly installed at the top of the supporting frame; a connecting plate is jointly installed between the supporting plate and the top of the supporting frame in a sliding mode. The device further comprises a limiting assembly and a driving assembly. The problems that in an existing construction mode, dismantling and rebuilding procedures are independent, construction links are increased, the construction period is tedious, and efficiency is low are solved; and secondly, in the window period before the primary support is dismantled and the secondary lining is built, the tunnel surrounding rock loses the temporary support, the stability can be obviously reduced, collapse or excessive deformation is extremely prone to occurring, and therefore the problems of personnel injury, equipment damage and construction period delay are caused.

The embodiment of the invention discloses a multi-stage collaborative supporting method and structure for an ultra-deep well large-span chamber, and the method comprises the following steps: firstly identifying an overlying key rock stratum and calculating a pressure relief range, carrying out'skylight opening 'excavation on the overlying key rock stratum of the large-span chamber to realize high stress transfer and pressure relief, and releasing pressure for the large-span chamber to be excavated. The cavern is in a low-stress state, and dynamic disasters such as rock burst and the like caused by cavern stress concentration or high-stress cavern large-deformation disasters are reduced; precise excavation is carried out to form a chamber, first-time supporting is carried out, high-pretightening-force yielding anchor cables are applied to a top plate and side parts, and a deep and shallow part cooperative bearing layer is formed through long anchor cables and short anchor cables; and then secondary supporting is carried out, loosening blasting pressure relief is carried out on the base angles, a high-strength concrete-filled steel tube support is erected, and the space between the high-strength concrete-filled steel tube support and the surrounding rock is filled with a yielding back plate. And then grouting anchor cables are constructed at the bottom corners to block stress transfer, and pressure relief drill holes are constructed in the top slope part to regulate and control the surrounding rock stress. And finally, an anti-slide pile is vertically arranged in the center of the bottom plate.

The utility model provides a slope impact testing machine. The slope impact testing machine is characterized in that a base is arranged on one side of the bottom of an impact table; the first bearing seat is connected to the top end of the side, away from the impact table, of the base through bolts. The impact track frame is arranged over the base, second bearing seats are clamped on the front side and the rear side, close to the impact table, of the impact track frame, the bottoms of the second bearing seats are connected with the impact table, a lifting module is arranged in the center of the side, close to the impact table, of the impact track frame, and the bottom of the lifting module is clamped in the center of the first bearing seat; the loading trolley is arranged at the top of the impact track frame; the center of the trolley positioning and stopping module is arranged at the bottom of the loading trolley, and the left side and the right side of the trolley positioning and stopping module are arranged on the left side and the right side of the bottom of the impact track frame. Technicians judge whether the package design is qualified or not by judging whether the outer package of the household appliance has large deformation and fracture or not.

This invention discloses a machining fixture and method for machining the mating surface of an embedded horizontal flange split casing, belonging to the field of machining technology. The fixture includes a second adapter seat, a first adapter seat, and a base connected sequentially from top to bottom. The base, the second adapter seat, and the first adapter seat are all semi-annular structures, and the radii of the second adapter seat and the first adapter seat are the same as the top radius of the base. Several pressure plates for fixing the casing to be machined are provided on the second adapter seat, the first adapter seat, and the base, with the pressure plates positioned near the mating surface of the casing. This invention solves the problems of large deformation and high machining difficulty of the mating surface of large casings, addresses the issues of vibration and difficulty in ensuring accuracy using conventional methods, improves the pass rate of colorimetric inspection of mating surfaces of high-pressure casings and other parts, achieves stable machining of the casing mating surface, and meets the machining requirements of the parts.

The invention relates to a wing large deformation test load reconstruction and optimization design method, which comprises the following steps of: determining a loading point coordinate and a force line direction after wing deformation, and controlling a coordinate after plane deformation; determining an accumulated load after the theoretical state control profile is deformed according to design input; according to the coordinates of the loading points after deformation, the force line direction and the coordinates of the control profiles after deformation, determining test state load accumulation after deformation of the control profiles of the large-deformation wing; constructing a nonlinear programming optimization model of the loading point load according to the theoretical state cumulative load and the test state cumulative load, and optimizing the deformed loading point load according to the nonlinear programming optimization model to obtain an optimal loading point load; and according to the optimized loading point load, calculating a test state cumulative load, and judging whether the difference between the test state cumulative load and the theoretical state cumulative load is within a preset error range or not, so as to solve the problems of unreal load simulation, low load processing efficiency and poor precision of the large-deformation wing structure.

The invention discloses a soft rock large deformation control method and a rapid support system suitable for TBM tunnel construction method characteristics, the method is implemented based on an anchoring support system composed of a short anchoring support system and a long anchoring support system, and the method is suitable for an open TBM construction scene: in a TBM tunneling process, before a shield is exposed, the shield is not exposed, and the long anchoring support system is not exposed; a short anchoring support system of a full-length anchoring anchor rod structure is timely arranged in the radial direction of the 180-degree area of the upper half ring of the tunnel section through a cutter head edge cutter hole, and the short anchoring support system and a shield cooperate to form an initial deformation control system; after the shield is exposed, according to the deformation degree of the surrounding rock, full-length anchoring anchor rods or pre-stressed anchor cables are adopted in a graded mode, long anchoring supporting systems are arranged at intervals with the short anchoring supporting systems in a spiral mode, then the long anchoring supporting systems are cooperatively borne with steel arches, reinforcing meshes and sprayed concrete, and the long anchoring supporting systems are matched with 70m system sprayed concrete and 1000m secondary lining construction behind a tunnel face. According to the method, the displacement around the hole is effectively controlled, the TBM is prevented from being stuck, and the construction safety and efficiency of the open-type TBM in the soft rock large-deformation geology are improved.

The invention belongs to the technical field of composite material structural part manufacturing, and particularly relates to a three-dimensional model compensation method for controlling curing deformation of a composite material product. Comprising the following steps that 1, the curing deformation state of a composite product is obtained; step 2, carrying out registration and alignment on the solidification deformation state and the theoretical model to obtain a relative position relation; 3, calculating according to the relative position relation to obtain a deformation compensation amount; 4, a shape optimizer is adopted, the theoretical model is compensated through the deformation compensation amount, and a three-dimensional compensation model is established; and 5, a composite material forming tool is designed according to the three-dimensional compensation model. According to the method for establishing the curing deformation point cloud analysis data of the composite material piece, the matching relation between the curing deformation state of the composite material piece with a complex shape and large deformation amount and a theoretical model is accurately obtained through a registration and alignment mode of the point cloud data (curing deformation state) based on model characteristics and the theoretical model.

The invention discloses a low-deformation guitar type hinge structure and a preparation method thereof and a flexible solar wing, the low-deformation guitar type hinge structure comprises a shaft core, a polyimide film, a connecting layer and a glass fiber grid layer, the polyimide film is bent along the middle to form the guitar type hinge structure, the guitar type hinge structure comprises a hollow cylindrical hinge roll and two blades, and the hollow cylindrical hinge roll is connected with the glass fiber grid layer. The shaft core is bonded in the hollow cylindrical hinge roll, the glass fiber grid layer is bonded between the two hinge pieces through the connecting layer, and the inner end of the glass fiber grid layer is bonded with the shaft core through the connecting layer. The low-deformation piano type hinge structure has high machining precision, and the large-deformation failure risk caused by hinge hole deformation due to on-orbit high and low temperature alternation is reduced.

The invention relates to a protective material transient large deformation test system based on an elastic sensing fiber web, which comprises an elastic sensing unit, a switching box and a general data collector, the elastic sensing unit comprises a rectangular frame and an elastic sensing fiber web, the inner side of the rectangular frame is provided with a containing groove, and the elastic sensing fiber web is arranged in the containing groove. A plurality of double-end terminals are installed on the outer sides of the four edges of the rectangular frame, a first FPC adapter plate is fixed to the bottom of the rectangular frame, the elastic sensing fiber net is composed of a plurality of stretchable sensing fibers which are interwoven in the warp direction and the weft direction, and the two ends of each stretchable sensing fiber can be clamped and fixed through the corresponding double-end terminals respectively. And the other end of the double-end terminal is connected with the first FPC adapter plate through a Dupont line. According to the method, high-precision detection can be carried out on deformation of the protective material, and elastic recovery and permanent fracture can be distinguished in a transient large deformation scene, so that the protective material is accurately evaluated.

The application discloses a kind of low prestress energy-absorbing anchor rod of expansion shell and its construction method, including cone head, expansion shell piece, inner rod and sleeve rod, the rear end of cone head and inner rod are connected in axial direction, wherein: cone head includes conical section, circular table section and cylindrical section connected in axial direction from front to back;Expansion shell piece is cylindrical shell, coaxially sleeved on the outside of cone head;When cone head moves towards the direction of expansion shell piece rear end, the large diameter part of circular table section enters expansion shell piece backwards, and expansion shell piece deforms radially outward;Inner rod is columnar rod body, and a plurality of first arc protrusions are arranged on the upper and lower walls of the rear section, and the first arc protrusions are arranged at intervals;Sleeve rod is columnar shell, and a plurality of second arc protrusions are arranged at intervals on the inner wall of each semicircular cylindrical shell along the length direction;Sleeve rod is coaxially sleeved on the outside of inner rod, and the second arc protrusions and the first arc protrusions are engaged.The anchor rod is firmly anchored, has excellent extension performance, and can be applied in soft rock large deformation or hard rock rock burst stratum reinforcement engineering.

The application discloses a kind of multi-directional multi-functional parallel type metal damper of shock insulation layer, it is related to damper technical field, including base, rotary installation is rotated in base, and the upper portion of rotary disc is provided with pressure disc, and the upper surface of pressure disc is installed with connecting disc, by the innovative three-dimensional space multilayer U type nested matrix structure, adaptive slide rail fastener system and modular multi-directional parallel assembly system, optimization structure design, material selection and manufacturing process, realize damper under the complex load effect High efficient energy dissipation, wind resistance, tensile, limiting and self-resetting.Meanwhile, introduce intelligent reset mechanism, promote damper reset under the condition of large deformation, large residual deformation, ensure subsequent use function and maintenance-free, to improve safety and reliability, reduce installation and maintenance cost.The multistage deformation concept proposed in the application can realize multistage energy dissipation, multistage wind resistance and multistage limiting function, and can simultaneously adapt to seismic and vibration control requirements.