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.

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 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 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.

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 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.

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.