100results about How to "Improve stress environment" patented technology

The invention discloses a ground fissure tunnel asphalt concrete composite lining, wherein an initial lining, an asphalt concrete composite lining and an inside lining are sequentially arranged in an influence interval of a ground fissure from a surrounding rock soil body to a tunnel axial center, deformation joints A are arranged on the inside lining at intervals along a tunnel axis, injected holes are reserved at the bottom of the inside lining at both sides of the deformation joints A, and a displacement monitor is installed at the outer side of the asphalt concrete composite lining. The invention also discloses a supporting method of the ground fissure tunnel asphalt concrete composite lining, and an asphalt concrete pouring material is prepared by mixing modified asphalt after hot melting with sand and stones by adopting a stepped excavation and mining construction method; an asphalt mastic material is filled in the deformation joints A to flexibly connect the two adjacent segments of inside linings and carry out waterproof processing and the like for construction joints at the section of the inside lining. The composite lining has simple structure, convenient construction, safety and reliability and is suitable for being used in ground fissure active regions or meizoseismal regions.

The invention discloses a method of roof cutting pressure relief of the narrow coal pillar gob side through static bursting for gob-side entry driving. According to the method, firstly, the drilling position and drilling relevant parameters of the separation distance, the diameter, the angle and the depth are determined; secondly, drilling construction and hole sealing operation are conducted; thirdly, slurry grouting of a static bursting agent is conducted, and roof cutting pressure relief is conducted through static bursting; and fourthly, gob-side entry driving is conducted. According to the method, recovery of an upper section working face and forward groove driving of a lower section working face are conducted simultaneously, and the problem of intense linkage of mine excavation is effectively relieved; and after entry-side roof cutting pressure relief, the stress environment of gob-side entry driving surrounding rock is greatly improved, surrounding rock deformation is greatly reduced in the entry driving process and after entry forming, the engineering quantity of entry supporting is small, and the repair rate is low.

A static breaking roof cutting and pressure releasing method for a gob-side retained roadway comprises the steps that the roof cutting position is selected; the intervals, diameters, angles and depths of drilled holes are determined; drilling construction and charging are conducted; the dosage of static blasting agents is calculated; and punching, charging and hole sealing serve as one time of roof cutting and pressure releasing working circulation and are conducted circularly. Roof cutting and pressure releasing construction is conducted in the retained roadway on the rear portion of the working surface, so that the working procedures of punching, charging, hole sealing and the like, working surface stoping and manual wall building do not interfere with one another, and smooth conducting of roof cutting and pressure releasing is facilitated; and roof cutting beside the roadway is achieved before retained roadway surrounding rock deforms to destroy a suspending roof structure of the retained roadway gob side, so that a suspending roof beside the roadway fully collapses, the stress environment is improved, and the purpose of reducing stress concentration and mining pressure of a roof on the side of the gob-side retained roadway is achieved.

The invention discloses a composite reinforced roadbed and a construction method. The composite reinforced roadbed comprises water-permeable concrete piles, waste tires, connection pieces and gravels, wherein the water-permeable concrete piles are sequentially poured to peaks of triangles according to the shapes of equilateral triangles; each longitudinally cut waste tire is fixed on a steel bar of each water-permeable concrete pile; the water-permeable concrete piles are connected through the connection pieces in sequence and are buried on the roadbed; the equilateral triangles and the tires are filled with the gravels; the structure is filled with the soil roadbed. According to the composite reinforced roadbed, the waste tires are arranged at the bottom of the roadbed and replace part of the soil body; compared with the friction force in the soil body, the friction force between the soil body and the waste tires or the friction force caused by indirect contact between the gravels and the tires is obviously increased; in spite of cohesive soil or non-cohesive soil, the cohesive force of the soil body or the inner friction angle of the soil body can be increased; the stability of a slope of the roadbed is improved.

The invention relates to a manufacturing method of a shallow trench structure, which comprises the following steps of: providing a semiconductor substrate and forming a shallow trench on the semiconductor substrate; forming an oxide sacrifice layer in the shallow trench; removing the oxide sacrifice layer; forming a substrate oxide layer in the shallow trench; and forming a filling oxide layer for filling the shallow trench on the substrate oxide layer. Through the technical scheme, a corner at the top end of the shallow trench can be rounded in the forming process, thereby improving the stress environment in the shallow trench, avoiding the damage of a subsequent process to the shallow trench, improving the electrical performance of a semiconductor device and enhancing the yield of a semiconductor product.

The invention relates to an intelligent continuous fermentation system for solid-state Baijiu. The intelligent continuous fermentation system comprises a fermented-grain mild compression machine, an operation transfer vehicle, an upper cover grabbing device, a fermentation tank lifting device, an operation vehicle, a fermentation tank, a fermentation temperature control bin and a turnover discharge device. Fermented grains are fed into the fermentation tank, the fermentation tank is stopped below the fermented-grain mild compression machine, and the fermented-grain mild compression machine performs compaction by an electric-hydraulic pusher pushing down a compression panel; after the compaction, the fermentation tank is transferred to the fermentation tank lifting device through the operation vehicle and just stopped above the upper cover grabbing device in a position-limited manner, and the upper cover grabbing device stably places an upper cover on the fermentation tank through lifting and unhooking; the fermentation tank is placed into the fermentation temperature control bin, the fermentation tank is moved through the operation transfer vehicle, the fermentation tank is moved out of the temperature control bin after the fermentation, and discharging is performed through the turnover discharge device to complete the whole fermentation process. The intelligent continuous fermentation system for the solid-state Baijiu is reasonable in structure and capable of achieving mechanical brewing.

The invention discloses a method for controlling integral caving of a roof through deep-hole segmented blasting kerf, belongs to the technical field of blasting kerfs, can solve the problem of the coal seam roof suspension without caving. According to the technical scheme provided by the method, and the problem of strong strata pressure behavior caused by the coal seam roof suspension without caving in coal mining is solved. Deep hole blasting is conducted on a main roof stratum so that the roof can be prevented from caving immediately after blasting, the main roof stratum in a blasting section after blasting can form a pre-crack weak face with the inclination angle the same as the spontaneous collapse angle of the stratum along a drilling arrangement line, the integrity of a main roof stratum plate structure is cut off, the roof strata directionally caves along the pre-crack weak face under the action of gravity, so that the concentrated stress in front of a mining roadway and a coalwall caused by large-area roof suspension of the roof can be effectively reduced, the stress environment of the roadway is improved, and meanwhile, timely caving of the roof behind the working face avoids the situations of goaf air leakage, gas gathering and residual coal spontaneous combustion.

The invention relates to the technical field of coal mining, in particular to a deep well coal-pillar-free gob-side entry driving method and a formed roadway. The deep well coal-pillar-free gob-side entry driving method comprises the steps of constructing a closed wall, constructing an advanced grouting drilling hole, constructing an observation drilling hole, grouting a residual area of a gate road under a previous working face and performing gob-side entry driving construction. Solid coal is positioned on one side of the formed roadway, a filling separation wall is positioned on the other side of the formed roadway, and the filling separation wall is positioned in the residual area of the gate road under the previous working face. According to the deep well coal-pillar-free gob-side entry driving method, a narrow coal pillar in the prior art is omitted, a filling material is used for filling the residual space of the adjacent roadway to form the low-elasticity filling separation wall, resource waste is reduced, meanwhile, the safety of gob-side entry driving is greatly improved, the process is simple, and operation is easy.

The invention discloses a method for controlling roadway deformation by presplitting blasting pressure release of a base angle of a roadway protection coal pillar. In the method, outside the scope of an advanced supporting area of a working surface, drilling is constructed at a certain angle in the direction towards a bottom plate of the coal pillar at the base angle of the roadway protection coal pillar; the bottom plate is presplit in a group charging one-time blasting, so that concentrated stress of the roadway protection coal pillar and a surrounding rock of a roadway is effectively released, the deformation of the roadway, in particular the deformation of the bottom plate, is reduced, and a control effect of the surrounding rock of the roadway is improved; compared with the traditional heaving floor treatment method of excavation of a pressure relief groove, floor grouting, floor anchoring and the like, the method disclosed by the invention has the advantages that the construction is simple, the labor and the material cost are saved, and high efficiency and stability are realized, therefore, the applicability is wide.

The invention provides a high-strength low-rigidity porous titanium implant. The porous titanium implant comprises threaded parts, a porous structural part, and a support structure part. The upper segment and the lower segment of the porous titanium implant are the threaded parts, porous structures are embedded in the middle segment and the tip end, and the support structure part is embedded in the middle segment porous structure to connect the upper threaded part with the lower threaded part. The porous titanium implant has sufficient compressive strength, and has a controllable elastic modulus similar to that of human skeletons, the contact position of the implant and bone tissues has a good stress environment, and the porous structures capable of promoting bone integration can improve the success rate of the dental implant.

The invention discloses a wheel storing device of amphibious vehicles. A rocker arm support and a speed reducer are fixedly installed on the top of a frame assembly. The input end of the speed reducer is connected with an output shaft of a motor, the output end of the speed reducer is coaxially connected with the upper end of a rocker arm, the lower end of the rocker arm is hinged to the upper end of a shock absorber, the lower end of the shock absorber is hinged to a first supporting lug in the middle of a lower cross arm, the inner end of the lower cross arm is hinged to the frame assembly, and the outer end of the lower cross arm is hinged to the middle of a steering arm. A wheel assembly is installed on the bottom of the steering arm. The rotating shaft end of an upper ball joint bearing is fixed to the top of the steering arm, and half shafts are coaxially arranged on the front side and the rear side of a case of the upper ball joint bearing respectively and are installed in sleeve structures at the outer end of an upper cross arm through bushes. The inner end of the upper cross arm is hinged to the upper part of the frame assembly. The frame assembly, the lower cross arm, the steering arm and the upper cross arm form a four-connecting-rod mechanism. According to the invention, on the premise of guaranteeing that wheels are normally stored, the storage angle is large, the gravity center of the whole vehicles is effectively lowered, the overall vehicle arrangement is convenient, and the stressing environment of the shock absorber is improved.

The invention belongs to the field of mines, and relates to a cross-district double-U-shaped ventilating system for a high-gas working face and an application method for the cross-district double-U-shaped ventilating system. The working face is mainly served by an air inlet roadway, an air return roadway, an air inlet gas exhaust tail roadway and an air return gas exhaust tail roadway of the ventilating system, and the air inlet roadway is connected with the air return roadway by the working face, so that an inner U-shaped ventilating system is formed; the air return gas exhaust tail roadway is distanced from the outer side of the air return roadway by 5-20m, the air inlet gas exhaust tail roadway is distanced from the outer side of the air inlet roadway by 150-350m, and the two gas exhaust tail roadways form an outer U-shaped ventilating system by the aid of an auxiliary cut hole. The double-U-shaped ventilating system and the application method have the advantages that the problem of gas accumulation at upper corners and a gob of an existing high-gas working face is solved, an excellent stress environment is provided for roadway driving and maintaining by a cross-district huge coal-pillar entry protection process, the coal recovery rate of each district is increased by means of reducing the width of each coal pillar between the corresponding roadways, and social and economic benefits are obvious.

The invention provides a steel reinforcement connecting device which comprises a connected steel reinforcement, a passing self-locking sleeve, a positioning self-locking sleeve and a sleeve. The connected steel reinforcement is provided with a thread at one end. An inner hole of the passing self-locking sleeve is penetrating and is provided with an inner thread in threaded fit with the connected steel reinforcement. A section of outer thread of the passing self-locking sleeve is formed on the outer surface at one end of the passing self-locking sleeve. An inner hole of the positioning self-locking sleeve is penetrating and is provided with an inner thread in threaded fit with the steel reinforcement. A section of outer thread of the positioning self-locking sleeve is formed in the outer surface at one end of the positioning self-locking sleeve. The two ends of the sleeve are opened. Inner threads in threaded fit with the outer thread of the passing self-locking sleeve and the outer thread of the positioning self-locking sleeve are separately arranged in opened inner hole in two ends.

The invention discloses a friction extrusion strengthening method of a structural member connecting hole, and belongs to the technical field of machining. The method comprises: using a friction extrusion head as a friction extrusion strengthening tool, under the condition of maintaining 0.02-1 mm extruding magnitude of interference between the friction extrusion head and a connecting hole, rotating the friction extrusion head and inserting into the connecting hole on a structural member in uniform speed, and stopping rotation for 2-5 s, and then pulling the friction extrusion head out; the rotation speed of the friction extrusion head being 100-1000 rpm, insertion speed being 0.1-2 mm/s, and pulling-out speed being 0.3-2 mm/s. In the above process, residual compressive stress is formed on neighborhood of the wall surface of the hole, and plastic flow occurs to the material near the wall surface of the hole, and the material has lattice distortion, and dislocation density is increased, so as to realize friction extrusion strengthening on the structural member connecting hole. The method is mainly used in strengthening of important structural member connecting holes in aviation, aerospace, trains, and ships, and other industries.

The invention discloses a method for preventing and controlling compression type rock burst of a coal pillar, relates to the technical field of coal mining, and mainly aims to reduce the concentrationdegree of high stress in the coal pillar, reduce and even eliminate the hidden danger of severe rock burst caused by high stress of the coal pillar, reduce the anti-impact work amount and reduce theanti-impact cost. The method comprises the following steps: determining a lateral high-stress concentration area of the coal pillar; constructing a coal seam pressure relief hole in the coal pillar ofa first roadway along a second roadway according to a preset depression angle by adopting a drilling machine until the coal seam pressure relief hole penetrates through the coal pillar; withdrawing adrill rod of the drilling machine to the initial point position of the high-stress concentration area, carrying out cutting while withdrawing the drill rod on the pressure relief hole of the coal beduntil the drill rod withdraws to the final position of the high-stress concentration area, so as to perform reaming and slotting on the high-stress concentration area, and forming a cavity with the diameter far larger than that of the pressure relief hole of the coal bed in the high-stress concentration area, wherein the cavity is used for releasing the stress of the coal pillar to achieve the purpose of preventing rock burst.

The invention discloses a shallow trench isolation structure and a manufacturing method thereof. The manufacturing method comprises the following steps of: providing a semiconductor substrate and forming a shallow trench on the semiconductor substrate; forming a liner layer which is made of silicon oxynitride in the shallow trench; and forming a filling oxide layer for filling the shallow trench on the liner layer. According to the technical scheme, the liner layer which is made of the silicon oxynitride is formed before the shallow trench is filled, so that the smoothness of the shallow trench and a stress environment in the shallow trench can be improved, the liner layer and the semiconductor substrate below the liner layer are prevented from being damaged during implementation of subsequent process manufacturing, isolation performance of the shallow trench isolation structure is enhanced, the electrical property of a semiconductor device is improved, and the yield of a semiconductor product is further improved.

The invention provides a method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in a transition support area, and relates to the technical field of mining engineering. The method comprises the steps: A, an entry for supporting gob-side entry retaining is reinforced through anchor rods and anchor cables, and a single hydraulic prop is arranged besidethe entry; B, an inner side traveling-direction roof cutting line is arranged on the advanced position of an entry working face for gob-side entry retaining; C, anchor rods and anchor cables are additionally arranged while stoping is conducted along with the working face, and an outer side traveling-direction roof cutting line is arranged; D, the maximum suspended roof distance of combined rock beams is calculated, the roof cutting stepping distance is determined, the roof cutting stepping distance is smaller than the maximum suspended roof distance, and an inclination-direction roof cutting line is arranged every time the working face is propelled by the distance exceeding the roof cutting stepping distance; E, the combined rock beams fall to form entry sides, and seams between the entrysides and an entry roof are blocked; and F, propelling is conducted along with the working face, the step B to the step E are repeated, after entry surrounding rock is stabilized, the single hydraulicprop is withdrawn, and gob-side entry retaining is completed. The method solves the technical problem that gangue blocking of a thin coal seam during gob-side entry retaining is difficult and furtherhas the advantages that the entry sides are complete, and the deformation of the surrounding rock is small.

The invention relates to the technical field of spacers, and discloses a pre-twisted spacer, which comprises a supporting frame, wire clamps and pre-twisted wires. The supporting frame is composed of two supporting plates and a connecting piece, the connecting piece is located between the two supporting plates, and the supporting plates and the connecting piece are connected through bolts; the two wire clamps are arranged at the two ends of the supporting frame respectively. The wire clamp comprises a wire frame, a positioning frame, a semicircular ring, a fixing block and a screw rod. When the pre-twisted spacer is installed, the wire clamp is opened and clamped on a cable, the screw rod is rotated to close the wire clamp, so that the wire clamp is hung on the cable and cannot clamp the cable, stress concentration cannot be formed, the performance of the cable cannot be influenced, the pre-twisted wire is matched to be wound on the cable, and the wire clamp is fastened on the cable, so that the installation of the spacer is completed.

The invention discloses a track pedestal for a medical accelerator treatment bed, and belongs to the technical field of structural design of accelerator medical equipment. The track pedestal comprisesa circular base and a pedestal body; the circular base is fixed inside the foundation of the ground, the pedestal body cooperates with a positioning surface on the circular base for primary positioning, a center positioning hole and a circular track are internally processed in the pedestal body, the center positioning hole serves as a centering hole for the rotation of the treatment bed and has the functions of positioning the center of the bed body of the treatment bed and limiting the vertical direction, and the circular track is located at the edge of the pedestal body and provides supportfor a treatment bed pedestal; the pedestal body achieves the adjustment of the levelness of the circular track and the fixation of the circular base through a plurality of sets of adjustment holes. The track pedestal has the advantages of being simple in structure, high in rigidity, good in flatness of the track, high in installation precision, convenient to adjust, large in circular track diameter and the like, and can be applied to simulated positioner diagnostic beds or other machine tools and equipment with the rotary function.