139results about How to "Avoid local stress concentrations" patented technology

A vessel for a thermal energy storage system comprising a bottom wall joined to a surrounding side wall, and an inner liner disposed within the bottom wall and side wall and comprising an inner liner bottom and an inner liner side wall. One aspect of the inner liner bottom and side wall is that they are configured to repeatedly expand and contract during the thermal cycling of the storage system. A thermal energy storage system comprising the containment vessel and an array of heat exchangers is also disclosed. The heat exchangers are disposed in the vessel, and arranged so as to enclose a volume within the vessel. Each of the heat exchangers is suspended by a suspension assembly. The assembly may be comprised of a central support hanger, a spring loaded upper hanger, and a lower hanger.

The embodiment of the invention provides a display device. The display device comprises a reel part and a flexible screen, wherein the reel part comprises an inner shaft, and a step part is formed onthe inner shaft; the flexible screen is wound around the inner shaft from the low side of the step part in a drawing mode, through the step part on the inner shaft, the flexible screen can be smoothlywound around the inner shaft, and the flexible-screen local stress concentration problem caused by a flexible-screen local protrusion, dent or the like is effectively solved; when the flexible screenis unfolded or folded, the end stress concentration problem of the flexible screen is solved, the structural strength of the product is improved, and the service life of the product is also prolonged.

A fully-enclosed integral assembly grid concrete support method includes the steps: determining the number of grid components of each grid support and the sizes of main reinforcements, stirrups and angle steel of grids according to the designed shape and the size of a roadway needing support after bolt-mesh-anchor shotcreting primary support according to conventional technology; manufacturing a plurality of spliced grid components of three-dimensional support structures; and erecting the spliced grid components of the three-dimensional support structures in the roadway needing support along the direction of the roadway, fixing grouting pipes onto the main reinforcements of the grid components to erect a template and perform concreting, and performing full-face grout injection behind concrete walls of the grid supports by the aid of the grouting pipes to complete permanent support. By the aid of the method, the strength of a support body is greatly improved, and the support body is simple in structure and high in rigidity. The integrity of grid concrete and surrounding rocks is further improved, and a bearing structure jointly formed by the support body and the surrounding rocks is more uniformly stressed. The problem of difficulty in controlling stability of a difficultly supported roadway with extremely soft rocks and large sections is solved, and support cost is reduced.

The invention discloses a carburant and a preparation method thereof, and the technical problem to be solved is to improve the quality of the carburant. The carburant is composed of a graphite material and a bonding agent, wherein the graphite material is obtained by mixing micro-powder graphite and electrode powder, and the bonding agent is composed of an inorganic bonding agent and an organic bonding agent. The preparation method for the carburant comprises the following steps: uniformly mixing the micro-powder graphite with the electrode powder to obtain a mixture; carrying out thermal treatment on the mixture; mixing the inorganic bonding agent with the organic bonding agent; and adding the bonding agent into the graphite raw material to carry out pelletizing, thereby obtaining the carburant. Compared with the prior art, the fixed carbon content of the carburant is high, and the carburant is high in volumetric absorption capacity with iron parts and steel parts in a molten iron casting process, so that the quality of castings is improved, and the problems that the steel parts are easily cracked as a result of poor anti-impact toughness and low cracking energy absorption due to the fact that local stress concentration is caused by a great number of pores and crazes generated on the surfaces of the castings are overcome. The carburant prepared by the preparation method is high in pelletizing and molding ratio, and is low in production cost.

The invention relates to a mining cambered anti-impact sealing wall. Before the wall is manufactured, a slot is formed in a position where a tunnel is needed to be sealed; the slot is continuously distributed along left and right tunnel walls of the tunnel, a top plate and a bottom plate; the slot is 500 mm in depth and 500-800 mm in width. According to a direction where air billows come, the mining cambered anti-impact sealing wall comprises a stream guide layer, a filling layer, a cambered steel plate layer, a concrete sealing wall and a plane steel plate layer from inside to outside in sequence, wherein each layer reaches to the slotting borders of the left and right tunnel walls, the top plate and the bottom plate.

A cylindrical dynamic damper including: a cylindrical mass member disposed about a rotating shaft and coaxially therewith; and a pair of elastic support members having a pair of ring-shaped affixing members situated at axial ends of the mass member and mounted on an outside peripheral face of the rotating shaft and a pair of elastic support portions of cylindrical shape connecting respectively to the affixing members and to the axial ends of the mass member to thereby elastically support the mass member. The mass member has on inside peripheral corners of both axial ends slanted faces disposed in chamfered profile and varying in shape in the circumferential-direction; and the elastic support portions connected at one ends to the slanted faces have free length varying in the circumferential direction.

The invention discloses a method for controlling changes in three-truss height difference of combined highway and railway bridge for a structural system. Slide beams and slides are precisely hoisted before construction of a main bridge, and a three-truss height difference of lower bearing structures of steel trusses is controlled within 10 mm. The impact of the three-truss height difference upon the main bridge is analyzed by using finite element software analysis according to a design scheme and field initial data, and a safety limit of the three-truss height difference under various construction conditions is calculated; after each pushing, slider reversing is performed and point reading is redone according to field calculated elevations, and the three-truss height difference is precisely controlled within 1 mm; the bottom of each steel beam is contacted with sliders through elastic rubber pads, limiting relative vertical displacement of three main trusses during pushing and dynamically controlling the three-truss height difference. In the method, a three-truss large-span steel truss bridge is constructed by using a three-truss height difference control system, and the method is highly operable, convenient to construct, safe and reliable, economic and reasonable and is worthy of popularization in the construction of multi-main-truss large-span steel bridges.

The invention discloses a grouting bag and an application method. The grouting bag comprises an integrally-sealed bag body. The bag body is provided with at least one grouting port, and the bag body is made of elastic materials. When slurry capable of being cured is injected into the bag body, the bag body can be automatically expanded along with inflow of slurry. After grouting of the grouting bag, the space around the position where the grouting bag is located can be fully filled, the grouting bag is closely attached to the part between two steel shear keys through deformation of the grouting bag, and after the slurry is solidified, an anti-shear structure achieving shear force transmission through a cushion layer is formed between the two steel shear keys, good adaptability and high practicability are achieved in an immersed tunnel irregular anti-shear support system, and the problem of local stress concentration caused by other connecting manners can be effectively avoided; and meanwhile, the grouting bag can be used in the place with the narrow operation space, and due to the construction convenience of the grouting bag, the construction cost can be effectively reduced.

A self-stabilizing porous interbody fusion cage comprises a columnar main body, a bone grafting window, a clamping part and a porous reticulate body; the columnar main body is of a columnar hollow frame structure; the bone grafting window is arranged in the inner cavity of the columnar main body and is fixedly connected with the columnar main body through the clamping part; and the porous reticulate body is arranged in a space between the columnar main body and the bone grafting window. The preparation method of the self-stabilizing porous interbody fusion cage comprises the steps: firstly, arranging a plurality of fusion cages with gradient specifications; secondly, establishing a spine three-dimensional model, and obtaining parameters; thirdly, carrying out a pre-operation simulation operation, and simulating an evaluation effect; and fourthly, adopting 3D printing processing molding. The method has the advantage that personalized customization is performed according to the medical image data of the target cone segment of a patient. The upper and lower end faces of the columnar main body are respectively matched with the surface contours of the upper and lower end plates of the cone. The self-stabilizing porous interbody fusion cage conforms to the human cervical vertebra vertebral end plate form, enlarges the vertebral contact area, avoids local stress concentration of the contact surface, and reduces the sinking and collapsing risks of the implant.

The invention belongs to the field of wood processing, and particularly relates to a wood veneer treatment method and reconstituted wood. The method comprises the step of placing a wood veneer in a rolling machine according to the fibre cross-grain direction thereof, and rolling to obtain a treated veneer, wherein a roll gap of the rolling machine is 10-80% of a thickness of the wood veneer. With the adoption of the method provided by the invention, the wood veneer can be rolled into a broomed-meshy-structure veneer with fibres which are not broken in a longitudinal direction and loose in a transversal direction, a natural texture structure of raw wood is reserved, the rigidity of the veneer is eliminated, and an initial stress and a pressing pressure are reduced, thus the density uniformity of the pressed reconstituted wood is improved, and the warping and deformation of the reconstituted wood are reduced; meanwhile, the surface area of the treated veneer is increased, and glue dipping is more uniform, thus a cracking risk of the prepared reconstituted wood is reduced; and in addition, fine fibres in the treated veneer are mutually interleaved to increase an internal binding force, thus cracking and warping risks caused by the reconstituted wood are further reduced.

The invention discloses a concrete bridge reinforcing method and structure. The concrete bridge reinforcing method includes the following steps that firstly, at least two first anchoring seats (1) are fixed to one end of a pulled region of a concrete bridge body in a transversely-staggered manner through anchoring bolts along a concrete bridge (7) and second anchoring seats (2) are fixed to the other end of the pulled region in a transversely-staggered manner through anchoring bolts along the concrete bridge, wherein the number of the second anchoring seats is the same as that of the first anchoring seats; secondly, the two ends of each pre-stressed reinforcement (3) are installed on the corresponding first anchoring seat and the corresponding second anchoring seat, each first anchoring seat and the corresponding second anchoring seat are provided with one pre-stressed reinforcement, and the pre-stressed reinforcements are parallel; and thirdly, the pre-stressed reinforcements are tensioned to form the reinforcing structure. By the adoption of the reinforcing method, local stress concentration of the concrete bridge can be avoided, the size is small, the dead weight is low, the anti-cracking reinforcing effect can be guaranteed, and the bending resisting and reinforcing efficiency is high.

A switch includes a case(2) including a recess(2a), a plurality of fixed electrodes (3a,3b)provided in the recess, a movable electrode provided in the recess, a pressing member and a buffer member. The case is mounted on a circuit board. The movable electrode is displaced between a first position where the plurality of fixed electrodes(3a,3b) are electrically connected each other and a second position where the plurality of fixed electrodes are not electrically connected each other. The pressing member(6) covers at least a portion of the recess(2a), and displaces the movable electrode from the second position to the first position by a pressing force applied from outside. The buffer member(7) is interposed between the movable electrode(5) and the pressing member(6), and is elastically deformed by the pressing force.

The invention relates to the technical field of structural thermal noise composite environment tests, in particular to a device and method for mounting a high noise resistance quartz window under a high temperature environment. The mounting device comprises brackets (3), thermal insulation felt (4), metal shock pads (5), fastening bolts (6) and gland nuts (7). The brackets (3) are U-shaped groove components and are arranged on the upper side and the lower side of the window of a mounted object (1), and the two brackets (3) with opposite openings are mounted to be used for constraining the quartz window (2). The thermal insulation felt (4) is arranged between the quartz window (2) and the brackets (3) in a cushioned mode. In the horizontal direction, the metal shock pads (5), the fastening bolts (6) and the gland nuts (7) are used for fixing the quartz window (2). By the adoption of the device and method, the mounting stress caused by thermal deformation of a traveling-wave tube can be relieved, meanwhile, stable pretightening force can be provided under the high temperature environment, and the integrity of the thermal noise test system is guaranteed.

The invention discloses a pushing-type tested hydraulic pressure application device for a shield tunnel structure prototype, which is formed by that the top of a tunnel structure prototype (2) of which the central axis is parallel to the ground is provided with more than two circumferential jacks (4); two ends of each jack (4) are respectively provided with a longitudinal left pushing beam body (3) and a longitudinal right pushing beam body (3); two ends of a hoop anchor rope (5) are intersected on the top surface of the tunnel structure prototype (2) between the longitudinal left pushing beam body (3) and the longitudinal right pushing beam body (3) after the hoop anchor rope (5) surrounds the surface of the tunnel structure prototype (2) for one circle; and two interacted ends are respectively connected with the longitudinal left pushing beam body (3) and the longitudinal right pushing beam body (3). According to the device, interference on structure hydraulic pressure simulation because of additional concentrated force on the hoop beam in a self-anchoring hoop method, so that the action and the influence on the prototype tunnel structure by the environmental hydraulic pressure can be truly simulated, more accurate and reliable test basis is provided for the design and the construction of underwater shield tunnel structure, and the tunnel can be safely built and operated.

The invention relates to a three-dimensional rotating connector for a special-shaped curtain wall. The three-dimensional rotating connector for the special-shaped curtain wall comprises an upper connector, steel frame anchoring parts, U-shaped connectors, a rotating shaft, an L-shaped connector, a sliding groove connector and a connecting bearing plate. The upper end of the upper connector is connected with a back-pack steel frame, the lower end of the upper connector is connected with the rotating shaft arranged on the U-shaped connectors in a floating mode, the upper connector can rotate around the rotating shaft by over 270 degrees and can slide to the two sides of the shaft simultaneously; the L-shaped connector is anchored with the U-shaped connectors and the sliding groove connector through bolts; the sliding groove connector is fastened with the connecting bearing plate through bolts after the angle is determined according to the curved surface feature of a building main body structure; the connecting bearing plate is fastened with a purline on the building main body structure through bolts. The three-dimensional rotating connector is mainly applied to connection between a building external wall decorative sheet back-pack steel frame and a building main body and is specially suitable for connection between a curved plate with a complex shape and the building main body, the cost of a large amount of design and production of non-standard connectors can be effectively reduced, and flexible connection can be effectively achieved.

The invention relates to an assembly type cement pavement construction method. A leveling layer is arranged on the lower portion of an assembly board, and a starting point assembly board, a middle assembly board and an end assembly board are laid on the upper portion of the leveling layer in sequence; a positive step interface and an inverted step interface are arranged in the connection positions of the assembly boards correspondingly; the end portions of the outer sides of a starting point end assembly board and a terminal point end assembly board are provided with lateral sway prevention buttresses and displacement side limiting pile connection holes; after the assembly boards are laid, displacement side limiting piles are driven into a lower structural layer of a pavement through the displacement side limiting pile connection holes; and finally, post-glue injection construction is conducted on seams and a seam resisting steel board is installed. The procedures are simple, the construction period of the cement concrete pavement can be greatly shortened, and various damages of the cement pavement can be prevented effectively.

The invention relates to a horizontally slidable device and an application method in jack lifting and unloading construction, belongs to the technical field of building construction, and is used for solving the problem that in construction, a jack overturns due to horizontal displacement of a lifted object. The horizontally slidable device comprises a top plate, a bottom plate, balls between the top plate and the bottom plate, a steel sleeve arranged on the lower surface of the bottom plate and a limiting device positioned at the end part of the bottom plate, wherein a gap is formed between the top plate and the bottom plate; the top plate can slide horizontally relative to the bottom plate through the balls. The application method comprises the following steps: firstly, adjusting limiting rods of the bottom plate to position the top plate in a central position and lock the horizontal freedom degree of the top plate; secondly, sleeving the top end of the jack with the steel sleeve to connect the horizontally slidable device and the jack; thirdly, putting the jack at a preset position, and adjusting the elongation of the jack to tightly press the upper surface of the top plate against the lifted object; and finally, at the beginning of the construction, unlocking the limiting rods to ensure that the top plate can slide horizontally during the construction process.

The invention discloses an aorta abdominalis covered stent. The aorta abdominalis covered stent comprises a covered stent and a bare stent, wherein the covered stent is of a cylindrical structure, comprises a covered fluid passageway and is used for being matched with the inner wall of an aorta abdominalis and suitable for expanding the aorta abdominalis. The bare stent is in a wavy shape and connected with the top end of the covered stent, and comprises crest structures away from the covered stent and trough structures close to the covered stent, and a fluid passageway is formed between each crest and the corresponding trough. The aorta abdominalis covered stent further comprises upper anti-disengagement fixing structures arranged on the crest structures and lower anti-disengagement fixing structures arranged on the trough structures, wherein the upper anti-disengagement fixing structures are used for being fixed to the portions, above a renal artery, of the aorta abdominalis, the lower anti-disengagement fixing structures are used for being fixed to the portions, below the renal artery, of the aorta abdominalis, and therefore the whole aorta abdominalis covered stent can be fixed into the aorta abdominalis.

The invention discloses a double-phase high-strength high-plasticity titanium alloy with a heterogeneous laminated structure and a preparation method thereof. The alloy is subjected to heat preservation for 1-2 h in a beta single-phase region at the temperature of 1000-1200 DEG C in a muffle furnace and then quenched to the room temperature to obtain a uniform beta phase, the obtained alloy is heated again to the temperature above a phase transformation point, heat preservation is conducted for 10-20 min, then rolling is conducted, and finally, a plate obtained through rolling is subjected to heat preservation for 1-10 min at the temperature 10 DEG C higher than the phase transformation point and then quenched to the room temperature, and the double-phase TRIP titanium alloy with the heterogeneous laminated structure is obtained. The two-phase TRIP titanium alloy with the heterogeneous laminated structure prepared by the method can obtain mechanical property combinations of the yield strength of 875 MPa, the elongation at break of 28%, the yield strength of 702 MPa and the elongation at break of 48.5%, and the yield strength of 595 MPa and the elongation at break of 45%.

The invention relates to a preparation method of high-strength gamma-polyglutamic acid hydrogel. The hydrogel contains gamma-polyglutamic acid, laponite and water. The preparation method includes the following steps of dissolving 8-20% of gamma-polyglutamic acid in distilled water to obtain a first reaction solution, adding laponite according to different proportions of the gamma-polyglutamic acid and the laponite to obtain a second reaction solution, adding a cross-linking agent into the second reaction solution, performing even stirring, regulating the pH of a system, and performing reaction at the temperature of 50 DEG C for 24 hours. The high-strength gamma-polyglutamic acid hydrogel prepared by means of the preparation method has higher mechanical strength, has better adsorption property to saline water, is applicable to the environment needing higher mechanical strength and has potential application value in the fields of materials, spinning and the like.

Provided is a run-flat tire that achieves a high dimension of both run-flat durability and riding comfort, and enables the improvement of steering stability during normal traveling. In the side-reinforced run-flat tire, the relationship between the rim width (Wr) and the distance (Do) to the tire equator plane from the center position of a peripheral-direction primary groove positioned to the outermost side in the widthwise direction of the tire in the outside region of the vehicle is 0.20 ≤ Do / Wr ≤ 0.30, the relationship between the rim width (Wr) and the distance (Di) to the tire equatorial plane from the center position of a peripheral-direction primary groove positioned to the outermost side in the widthwise direction of the tire in the inside region of the vehicle is 0.25 ≤ Di / Wr ≤ 0.35, the relationship between the groove width (Wi) of the peripheral-direction primary groove positioned at the outermost side in the widthwise direction of the tire at the inside region of the vehicle and the groove width (Wo) of the peripheral-direction primary groove positioned at the outermost side in the widthwise direction of the tire at the outside region of the vehicle is 0.80 ≤ Wo / Wi ≤ 0.90, the relationship between the thickness (Ga) at a rim check line position of an outside rubber portion at the outside of a carcass layer and the greatest thickness (Gb) of same is 0.8×Gb ≤ Ga ≤ 1.0×Gb, and the relationship between the thickness (Gc) at the rim check line position of an inside rubber portion at the inside of the carcass layer and the thickness (Ga) is 0.7×Ga ≤ Gc ≤1.0×Ga.

A vehicle front structure reinforces a portion around a bumper to prevent local stress concentration. The vehicle front structure includes a first reinforcement (4) attached to the central part in the vehicle width direction of a bumper member (2), and includes second reinforcements (11) attached to the vehicle inside parts of corner parts (10) each defined by a side member (3) and the bumper member (2). The first reinforcement (4) is arranged so as to cover an upper part (2b) and a lower part (2c) of the bumper member (2). A side end part (4b) in the vehicle width direction of the first reinforcement (4), which is arranged in the upper part (2b) and the lower part (2c), is formed so as to extend to the outside in the vehicle width direction toward the rear of the vehicle. The second reinforcement (11) is formed into a triangular shape corresponding to the corner part (10), and has a side part (11a) tilting to the outside in the vehicle width direction toward the rear of vehicle so as to connect the side member (3) and the bumper member (2) with each other. The side end part (4d) of the first reinforcement (4) and the side part (11a) of the second reinforcement (11) are arranged on the same straight line.

The invention relates to a mold for a laboratory, in particular to a dumbbell-shaped mold for testing concrete axial tensile performance tests and a corresponding test method. A concrete axial tensiletest mold comprises a bottom plate and four side plates, wherein the bottom plate and the side plates form a vertical box body with an open top end and a hollow inside; the front and back side platesare respectively provided with six through holes; the front and back side plates are connected and fixed through threaded screw bolts; two screw bolts at the bottom pass through preserved holes of bottom plate fixing blocks, so that the side plates and the bottom plate are connected; the front and back side plates and the bottom plate are provided with fixing blocks for limiting the left and right side plates; four side plates are subjected to circular arc transition into a dumbbell-shaped middle vertical region. The test device uses a method of an auxiliary rigid rod; the rigidity of a testmachine is improved; a concrete axial tensile stress-strain descending section is obtained. The mold is simple in installation and operation; the formed test piece is high in precision; the manufacturing is efficient and concise; the expected effect of the test is high; the concrete axial tensile stress-strain full curve can be accurately tested.

The invention relates to a construction method for repairing lateral displacement of a retaining wall. The method is characterized by comprising steps as follows: vertical borrow holes are vertically drilled in a soil body on the outer side of the wall back of the retaining wall, and dual-layer pressure balance hoses are inserted; transverse reaction steel plates and vertical reaction steel plates are arranged on the wall surface of the retaining wall, and transverse tie bar penetration holes and retaining wall ejection limiting grooves are formed in the transverse reaction steel plates and the vertical reaction steel plates respectively; a temporary reaction column is arranged on the outer side of the retaining wall, ejection devices are arranged between the reaction column and the reaction steel plates, and obliquely downward ejection force is applied to the retaining wall; transverse tie bars are arranged between the retaining wall and the soil body on the outer side of the wall back; obliquely downward ejection force and transverse pull force are applied to the retaining wall while vertical borrowing is performed; finally, oblique grouting holes are formed in the bottom of a foundation of the retaining wall, and solidified reinforcing bodies are formed through grouting. With the adoption of the method, the lateral displacement of the retaining wall can be repaired quickly, the integrity of the repaired retaining wall and the soil body on the outer side of the wall back can be enhanced, and the carrying capacity of the foundation of the retaining wall can also be improved.

The invention discloses a tertiary elastic element serially connected variable-rigidity elastic hanging device, which mainly consists of a belt pulley supporting assembly, an upper guide column, a guide sleeve, an upper supporting plate, a belt pulley fixing plate, a flange, a lower guide column, a hanging hydraulic cylinder, a lower supporting plate and a belt pulley pressing assembly. An arrangement structure including an upper layer, a middle layer and a lower layer is adopted, the belt pulley supporting assembly is mounted on the upper layer, the hanging hydraulic cylinder and a belt pulley supporting hydraulic cylinder are mounted on the middle layer, and the belt pulley pressing assembly is mounted on the lower layer; main supporting components include the upper supporting plate and the lower supporting plate which are connected via the guide sleeve in a welded manner, and the lower guide column and the guide sleeve are fixedly mounted on two sides of the upper supporting plate to form a guiding mechanism; and the hanging device is divided into 22 groups of independent variable-rigidity elastic units. The hanging device has the advantages of good passing ability of pipelines and high adaptability to sudden change of tube diameters, and is applied to a crawler-type transmission walking system.

An electrode composite having such a structure that a first active material layer and a second active material layer are formed on two principal surfaces of a sheet body functioning as a current collector is formed. Each of the first and the second active material layer includes a plurality of strip-shaped parts which extend in a longitudinal direction of the sheet body and are arranged at a distance from each other. An area of a first principal surface of the sheet body corresponding to a gap between the second strip-shaped parts on a second principal surface is covered by one of the first strip-shaped parts; and an area of the second principal surface of the sheet body corresponding to a gap between the first strip-shaped parts on the first principal surface is covered by one of the second strip-shaped parts.

The invention relates to a method for manufacturing an air distribution blower, which is characterized by comprising the following steps of: (1) adding a binder into metal powder with the particle size of 20 to 400 meshes, uniformly mixing, clamping a metal wire mesh with the wire diameter of 0.1 to 3mm in the mixture, putting into a pressing mold, and pressing into an element blank by using an isostatic pressing machine under the pressing pressure of 100 to 250MPa; and (2) uniformly filling a sintering filler at the periphery of the element blank, sintering in a vacuum furnace or a hydrogen atmosphere furnace, raising the temperature to be between 300 and 400 DEG C, preserving heat for 1 to 3 hours, removing the binder, raising the temperature to be between 1,000 and 1,500 DEG C, preserving heat for 1 to 5 hours, and sintering to obtain the air distribution blower. Compared with the prior art, the air distribution blower has high compression resistance and production efficiency and low cost.