588 results about "Rubber membrane" patented technology

A moisture-curable adhesive composition that may be formulated to be free of volatile organic compounds, or substantially free of volatile organic compounds which is safe for chronic exposure, resistant to combustion, and provides a high peel strength useful for securing a rubber membrane material to a rigid roof deck includes a polymer having silicon-containing hydrolyzable terminal groups, a phenolic resin, and a non-polymeric silicon-containing hydrolyzable compound, wherein the ratio of the amount of polymer having silicon-containing hydrolyzable terminal groups by weight to the amount of phenolic resin by weight is greater than 2:1.

An adhesive rubber article of the type having a release liner covering its tacky, adhesive surface to prevent the adhesive rubber article from adhering to various substrates or to itself prior to its intended use includes an impression or mark presented on one or more surfaces for facilitating the alignment and application of the adhesive rubber article on one or more substrates. The release liner has been scored, perforated or otherwise cut in a longitudinal direction of the article such that the scoring of the release liner further produces a visual guide on the adhesive rubber article. Thus, upon removal of the release paper, the guide may be used to align and apply the adhesive rubber article to the various substrates. These adhesive rubber articles are particularly useful within the roofing industry for bonding panels of rubber membranes together or for use as flashing.

The invention discloses a vertical direct shear test device. The vertical direct shear test device comprises a base, a water injection pipe and a water drainage pipe, wherein a pressure chamber is arranged on the base, an upper cover of a shear chamber is arranged on the pressure chamber, a rubber membrane sleeve is arranged in the pressure chamber, the lower end of the rubber membrane sleeve is arranged on the base, the lower end of the rubber membrane sleeve is hermetically connected with the base, an upper shear box and a lower shear box are arranged in the rubber membrane sleeve, the upper and the lower shear boxes are respectively positioned at the upper end and the lower end of the rubber membrane sleeve, a test sample cavity is surrounded by the rubber membrane sleeve and the upper and the lower shear boxes, the upper and the lower shear boxes adopt shear components, each shear component comprises a substrate, the substrates are respectively provided with a shear block and a deformation block, the opposite planes of the shear block and the deformation block are coplanar with the shear plane of a test sample, water grooves are arranged on the opposite planes of the shear block and the deformation block, the water grooves extend to the substrates and penetrates the substrates, water through holes are formed, the water injection pipe is connected with the water through hole in the upper shear box, the water drainage pipe is connected with the water through hole in the lower shear box, a top cap is arranged on the upper shear box, and the top cap is provided with a vertical loading shaft.

The invention relates to an unsaturated soil hydraulic parameter measuring device and a measuring method. The device consists of a pressure chamber 12, a pneumatic pump 21, a vacuum pump 8, a loading frame 10, an appliance base 27, hydraulic pressure pipelines 4 and 20, and pneumatic pipelines 11 and 15. The pneumatic pipelines of the pressure chamber 12 are connected with a pneumatic sensor 16, a pneumatic control valve 18 and the pneumatic pump 21; a water filling pipeline 28 of the appliance base 27 is connected with a control valve 29; the hydraulic pressure pipeline 20 in the center of the sample base is connected with a lower clay plate 14, a hydraulic sensor 9, a water volume measuring pipe 17, a hydraulic pressure control valve 19 and the pneumatic pump 21; a hydraulic pipeline 4 in the center of a top hat is connected with the an upper clay plate 14, the hydraulic sensor 9, a water volume measuring pipe 6, a hydraulic pressure control valve 7 and the vacuum pump 8; a sample 30, a top cap 13, a clay plate 14, a sample 30 and a sample base 25 are arranged between two clay plates 14 and are wrapped by rubber membranes; the sample 30, a pneumatic sensor 23, a pneumatic control valve 22 and the pneumatic pump 21 are connected with the pneumatic pipeline 11 which passes through the rubber membrane from the middle of the sample 30; and the pressure of a weight 26 is added to the sample by the loading frame 10 and a pressurizing shaft 3. The device can be used for measuring soil and water retention curve and unsaturated permeability coefficient of various soils under the condition of three-directional loading.

The invention discloses a triaxial creep tester of unsaturated soil, and relates to a geotechnical test apparatus. By inlaying a china clay plate with high air entry value in the pedestal of a pressure chamber, the geotechnical test apparatus allows water in a soil sample to pass through the china clay plate, but exerted gas cannot pass through, thereby realizing the aims of controlling groundmass suction and ensuring waterdrainage. The upper part of the china clay plate has a sample sleeved with a rubber membrane, and the upper part of the sample is provided with a porous plate and a sample cap; the sample cap is connected with a set of pipelines capable of controlling air pressure to exert pore air pressure on the sample and control pore air pressure; and the bottom of the china clay plate is respectively connected with a wash pipe and a drainpipe which play roles in washing air bubbles on the bottom of the china clay plate and waterdrainage respectively. A sample pressure chamber adopts a double-layer pressure chamber, namely a double-layer organic glass cylinder. An inner pressure chamber is filled with air-free water to exert a confining pressure on the sample, while an outer pressure chamber exerts an air pressure of equivalent confining pressure value to eliminate the influence on bulk variate caused by the deformation of the inner pressure chamber.

Standard test methods for determining one-dimensional consolidation properties of soils using incremental loading in accordance with ASTM D2435, or AASHTO 216, and of those of other international and organizations, do not accurately predict the values of vertical settlement, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity in vertical direction, because fixed ring used in these tests do not allow horizontal settlement and dissipation of excess pore-water pressures in horizontal direction, whereas, in field, under application of a vertical load, both horizontal and vertical settlements occur along with dissipation of excess pore-water pressures in both vertical and horizontal directions. To overcome this more than 100 year old problem, the inventor (Dr. Ramesh Chandra Gupta, Ph. D., P.E.) has invented a test device for determining three-dimensional consolidation properties of soils, using a flexible ring which permits development of horizontal and vertical displacements, and dissipation of excess pore-water pressures in both horizontal and vertical directions, along with increased lateral resistance as takes place in field at any depth in a soil deposit when vertical load at the surface is applied.The flexible ring consists of filter fabric around the soil specimen, rubber membrane around the filter fabric, circular segmental metal plates around the membrane and elastomeric rubber bands or spring loaded jacket around the segmental plates, and allows horizontal and vertical displacements, dissipation of pore-water pressures in horizontal and vertical directions to take place with increased lateral resistance with each increment of vertical load like those in the field. Thus new test device simulates field condition to allow accurate determination of three-dimensional consolidation properties of soils (such as settlements, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity).For this new test device, conventional incremental consolidation frame or triaxial type chamber system either with the triaxial loading system or modified to adapt to incremental consolidation frame, shall be used to perform three-dimensional consolidation tests.

The invention discloses a sample preparation apparatus of a sandy clay triaxial test, comprising a pressure chamber base, a test top cap and a pressure chamber cylinder, wherein the upper end and thelower end of the pressure chamber cylinder are matched with the pressure chamber base and the test top cap; the pressure chamber consists of three circular arc sheets, and moreover, a tightening ringis sheathed on the cylinder so as to cramp the cylinder; the inner wall of each circular arc sheet is provided with a vertical air discharge duct and a transverse air discharge duct; and the middle-lower wall of the cylinder has a suction hole communicated with the vertical air discharge duct and the transverse air discharge duct. The invention has the advantages that air between rubber membranesand the circular arc sheets can be completely discharged, thereby enabling the rubber membranes to cling to the circular arc sheets, and therefore, the surface creasing of a sample is prevented, so that the sample with a smooth and even surface can be prepared; and the sample has the advantages of simple principle and convenient operation. The invention can conveniently prepare samples with different diameters and heights through changing the diameter and the height of a sample tube, thereby satisfying the demands of various tests.

The expandable jacket consists of the rubber membrane surrounding the cylindrical specimen, circular segmental metal plates surrounding the rubber membrane, and elastomeric rubber bands or rings around the segmental plates to permit uniform radial expansion and maintain uniform diameter of the specimen during the test and thereby providing accurate values of deviator stress, volume change characteristics and shear strength of soil specimen. To determine the three-dimensional coefficient of consolidation and coefficient of consolidation in horizontal direction, the flexible ring consists of all above structural components of expandable jacket except that a filter fabric or paper is wrapped around the cylindrical specimen, and then rubber membrane is mounted surrounding the filter paper or paper. The calibration device for calibration of the expandable jacket and flexible ring shall provide the magnitude of correction to be made in deviator stress and lateral resistance provided by the rubber bands or rings during the test.

The invention belongs to the field of tunnel engineering, and particularly relates to an indoor model experience device with an existing tunnel affected by double subway construction. The experience device mainly comprises a subway excavation simulating device, a tunnel model, a strainometer, a displacement support frame, a displacement meter, and the like. A hollow aluminum pipe is arranged in the middle of the tunnel excavation simulating device, a rubber membrane filled with water is arranged on the periphery of the tunnel excavation simulating device, and soil deformation which is caused by the tunnel excavation is simulated by drainage of water with a certain size. The tunnel model is simulated by aluminum alloy pipes, and the outer wall of the tunnel model is pasted with the strainometer in a full-bridge mode to achieve strain measurement on the existing tunnel. The displacement meter is fixed on the displacement support frame, and measurement on longitudinal settlement of the existing tunnel can be achieved. The indoor model experience device with the existing tunnel affected by the double subway construction can conveniently and effectively simulate the existing tunnel deformation caused by the double subway construction of a city, and has important reference value for establishing a tunnel construction security traversing technology standard and an adjacent structure security protective measurement.

Standard test methods using a fixed ring for determining one-dimensional consolidation properties of soils represent a subsurface condition where settlement and dissipation of excess pore pressure is possible only in vertical direction. This subsurface condition never occurs, as settlements and dissipation of excess pore pressures always occur in horizontal and vertical directions. Dr. Ramesh Gupta has invented a test device for determining three-dimensional consolidation properties of soils, using a flexible ring permitting displacements and dissipation of excess pore pressures in both horizontal and vertical directions, and affording determination of coefficients of consolidation in horizontal and vertical directions including three-dimensional coefficient of consolidation, and modulus of elasticity. The test device consists of a flexible ring consisting of filter fabric around the soil specimen, rubber membrane around the filter, circular segmented metal plates around the membrane and rubber bands or rings around the plates. Both incremental or triaxial type loading can be used with this device.

The invention discloses a large-scale true tri-axial test method and a large-scale true tri-axial test device, which can be used for carrying out the true tri-axial test on an original grading rockfill body. The device is arranged in a concrete cave chamber; six faces of a sample are loaded by rigid slabs; three directional main stress is applied by a hydraulic jack controlled by adopting a hydraulic system; two layers of rubber membranes are sleeved at the inner side of a steel plate so as to reduce friction; silicone grease is coated between the rubber membranes; and rigidity compression plates are respectively provided with a displacement sensor or a dialgage used for determining the deformation of the sample in all directions. The device can be used for testing a large-sized original grading sample of the rockfill body, therefore, the size effect can be completely avoided, larger axial strain can be achieved, and a complicated stress-strain path can be simulated.

The invention relates to a fatigue resistance testing device for a rubber membrane. A reciprocating transmission mechanism adopts a double-eccenter connecting rod type structure and is positioned on the top of the device; the top end of a reciprocating rod is connected with a counter; the reciprocating transmission mechanism is in driving communication with a motor arranged on the right top of the device; the bottom end of the reciprocating rod is in mechanical connection with a membrane clamping mechanism; the bottom of the center of the clamping mechanism is provided with a balancing spring; the right end of the membrane clamping mechanism is communicated with an air pressure pump through a valve; the middle part of an air inlet pipe is connected in series with an air pressure sensor and an air pressure meter; the middle part of the reciprocating rod is provided with a fixing piece; the upper part and the lower part of the reciprocating rod are provided with a sliding sleeve respectively; and the sliding sleeve restricts the moving direction of the reciprocating rod. The fatigue resistance testing device has the advantages of simple structural principle, large testing range, high efficiency, convenient operation and use, safe and reliable operation and good automation degree.

The invention discloses a triaxial test three-dimensional deformation reconstruction and measurement method and belongs to the technical field of geotechnical experiment testing. The method is characterized in that a transparent square pressure chamber is adopted, a specially-produced rubber membrane whose label can be tracked is marked, two digital cameras at the front and at the back and a corresponding image acquisition control and processing system are employed, through tracking the position change of the angle points of the rubber membrane on an image, a certain hypothesis is adopted to obtain the space coordinate of the characteristic points of the rubber membrane on the surface of a sample, and the images acquired by the two cameras at the front and at the back are spliced so that the measurement of the three-dimensional deformation of the sample during a triaxial test process is realized. Through combination with ANSYS finite element software, a three-dimensional deformation grid and a three-dimensional whole surface strain field of the sample are obtained. The method provided by the invention has the following advantages: the comprehensive deformation characteristics of the sample in the triaxial test process can be obtained from a front direction and a back direction, and the space positions of surface characteristic points in a triaxial test can be obtained for realizing reconstruction of three-dimensional deformation of the sample, and the distribution of the three-dimensional surface strain field of the sample can be obtained.

A moisture-curable adhesive composition that may be formulated to be free of volatile organic compounds, or substantially free of volatile organic compounds which is safe for chronic exposure, resistant to combustion, and provides a high peel strength useful for securing a rubber membrane material to a rigid roof deck includes a polymer having silicon-containing hydrolyzable terminal groups, a phenolic resin, and a non-polymeric silicon-containing hydrolyzable compound, wherein the ratio of the amount of polymer having silicon-containing hydrolyzable terminal groups by weight to the amount of phenolic resin by weight is greater than 2:1.

The invention relates to a natural gas hydrate rock core sample dwell transfer-type triaxial apparatus and a method thereof, which belongs to the technical field of natural gas hydrate base physical property measurement. The apparatus comprises a rock core transfer apparatus, a triaxial apparatus host, a confining pressure and aperture pressure control system, a computer data acquisition and a control system. By using the triaxial apparatus, a rock core is transferred from a sample storage device to the rock core transfer apparatus; the rock core transfer apparatus and the triaxial apparatus host are subjected to abutting joint and locked; a dwell rock core is transferred to a triaxial pressure chamber by the dwell rock core, an original plastic sleeve of the rock core is removed, and the rock core is sleeved by a rubber membrane, and pressure control and motion control are required during whole course of a hydrate dwell rock core transfer process. The apparatus realizes transfer of the hydrate dwell rock core, and realizes deposit intensity measurement under original cementation structure condition and consolidating condition of the hydrate, mechanical property of a practical storage layer is obtained, and the method has important meaning for revealing the destroy mechanism of the practical storage layer and evaluating the risk of exploitation geology of the natural gas hydrate.

The invention belongs to the technical field of biodegradable materials and particularly relates to a degradable thermoplastic rubber membrane and a preparation method thereof. The degradable thermoplastic rubber membrane using agricultural plant resources as a main material is characterized in that the degradable thermoplastic rubber membrane is prepared from the raw materials including plant skins and shells, vegetable fibre, plant-based powder, polymer, compatibilizer and plasticizer and functional additive, wherein raw materials comprise the following components by weight percent: 5-15% of plant skins and shells, 4-10% of vegetable fibre, 30-70% of plant-based powder, 3-7% of polymer, 17-40% of compatibilizer and plasticizer and 1-5% of functional additive; the functional additive is one of an odor absorbing agent, an insect-resist agent, preservative and a defoaming agent or a mixture including any two or more agents, and the mixture can be arbitrary ratio when being mixed with any two or more agents. The degradable thermoplastic rubber membrane provided by the invention not only has the physical mechanization functions of rubber and plastic but also the comprehensive function of ordinary rubber and plastic; in addition, the degradable thermoplastic rubber membrane prepared by the method provided by the invention has the characteristics of low cost and capability of biodegradation.

The invention discloses a laminar vibrating shear soil box testing apparatus. The laminar vibrating shear soil box testing apparatus comprises a shear soil box, a vibrator and a driving device, wherein the shear soil box comprises frame layers; the frame layers are connected with a linear guide rail through a sliding block capable of locking and releasing in the longitudinal direction, and connected with a hemispherical column through a resilient plate spring in the transverse direction and in a hinge manner; the frame layers are placed on a base plate of the vibrator; fold type rubber membranes are arranged inside the shear soil box; folds are inserted among the frame layers and in the gaps between the frame layers and the base plate; the base plate of the vibrator is supported on a floor beam through the plate spring and a spring respectively; base plate holes allowing porous stones to be mounted are formed in the base plate; the bottom beam is fixed on the ground of a laboratory; the driving device comprises an electrical servo actuator arranged on the end face of an I-shaped girder, and a force sensor connected with the electrical servo actuator; the electrical servo actuator is mounted on a reaction wall through a connecting plate. The apparatus can simulate the communication process of shear waves in soil layers with limited thickness in the case of earthquake; the laminar vibrating shear soil box overcomes the limitation of a shear force on a common vibrostand base; the apparatus has the characteristics of being simple in structure, economical in manufacture cost, and convenient to mount and apply.

The invention discloses a layered shear model box for a centrifuge shaking table test. The shear box is formed by sequentially overlapping a first layer to a twelfth layer of equal-thickness hollow rectangular aluminum alloy shear frames from top to bottom, eleven upper layers are movable layers, the lowest layer is a fixed layer fixed onto a gland plate connected with a bottom plate, rolling grooves are arranged among the layers in the length direction, rolling shafts are placed in each rolling groove, horizontal displacement sensors mounted on displacement sensor clamps are arranged on two sides of each of the eleven upper layers in the length direction, metal steel sheets are mounted on two sides of each of the eleven upper layers in the width direction, a rubber washer is arranged between the gland plate and the bottom plate, a rubber membrane is mounted on the inner side of the shear box, the bottom end of the rubber membrane is connected with the washer inlaid between the lowest layer of shear frame and the bottom plate, a drainage system is arranged in the bottom plate of the shear box, and the bottom plate is fixed onto a shaking table in the test. The layered shear model box is capable of simulating the action of soil bodies on a semi-infinite site through a model of a finite size, and is light in weight, simple in structure and convenient in installation and application.

The invention discloses a sample preparation device for a coarse-grained soil triaxial test, and belongs to the technical field of soil body testing apparatus. The sample preparation device comprises a pressure chamber pedestal, an outer pressure chamber cylinder, a rubber membrane, porous stone, an inner pressure chamber cylinder, an isolating cloth cover, a funnel, a cylindrical compaction device and an annular compaction device, wherein the porous stone is arranged inside a groove in the pressure chamber pedestal; the lower end of the outer pressure chamber cylinder is fixed on the pressure chamber pedestal; the rubber membrane tightly covers the inner surface of the outer pressure chamber cylinder; the inner pressure chamber cylinder for containing coarse aggregates is arranged inside the outer pressure chamber cylinder; the isolating cloth cover tightly covers the outer surface of the inner pressure chamber cylinder. The invention further discloses an application method of the device. The sample preparation device disclosed by the invention cannot cause deformation of the coarse aggregates; meanwhile, the rubber membrane is protected by a sand layer to avoid breakage; the specimen can be prevented from oversize disturbance due to the cylinder lifting process in the pressure chamber; the sample preparation device is quick in specimen filling speed and high in efficiency, and can effectively ensure normal operation of the test.

The invention discloses a geotechnical triaxial test sample preparation split round mold and a sample preparation method, belonging to the technical field of civil engineering equipment. The split round mold comprises two parts, namely a split cylinder and a lantern ring, wherein the split cylinder is axially divided into a split cylinder a and a split cylinder b; a U-shaped hole is formed in the split cylinder a; four grooves are formed in the bottom of the split round mold, so that the split round mold is firmly attached to a pressure chamber base; a vacuum exhaust opening is formed in the split cylinder a and is connected with an exhaust bolt and a rubber exhaust guide tube, so that a rubber membrane covers and is tightly attached to the inner surface of the split mold so as to form a uniform sample; the lantern ring is made of stainless steel, the thickness of the lantern ring body is 0.5mm, a bolt rod is connected to the ring body, and the split cylinder can be clamped. The split round mold disclosed by the invention is convenient and rapid to assemble and firm to clamp, the two 1 / 2 split cylinders are spliced to form two connecting gaps, and the manufactured geotechnical triaxial test sample is uniform in compactness, so that reliable geotechnical triaxial test data can be acquired.

The invention discloses a high-airtightness sample preparation device which comprises a base, multiple arc-shaped tile molds, a hood, a compaction guide rod and a clamping device, wherein the multiple arc-shaped tile molds are butted to form a barrel, the barrel sleeves a boss of a base, the hood is arranged at the top end of the barrel, a rubber membrane is lined at the inner side of the barrel, the multiple arc-shaped tile molds have air exhaust holes, the air exhaust holes are provided with rubber pipette bulbs, the rubber membrane sleeves the boss of the base and is tightly hooped, the lower end of the compaction guide rod is provided with a round compaction head, the compaction guide rod is provided with a clamping plate, the clamping device is composed of two semi-circular plates, a round insertion hole is formed in the center of each pedal of semi-circular plate, a compaction hammer sleeves the compaction guide rod, water-permeable stone is arranged on the base, an airtight space is defined by the barrel and the rubber membrane, internal pressure passages are formed on the base and the hood and are communicated with the inner cavity defined by the rubber membrane. A sample prepared by the device provided by the invention is uniform and has a size strictly meeting requirements, the device is convenient to operate and the compactness of the sample can be easily controlled. The invention further provides a method for preparing a sample by adopting the high-airtightness sample preparation device.

The invention belongs to the technical field of two-way pipe joints, in particular to a reducing two-way pipe joint. The reducing two-way pipe joint comprises a pipe body; the left end of the pipe body is provided with a sizing interface; sealing units are arranged at the position of the sizing interface; the right end of the pipe body is provided with a reducing interface; a reducing unit is arranged at the position of the reducing interface; the interior of the pipe body is fixedly connected with a rubber ring; the reducing unit comprises a rotating ring, reducing plates and telescopic links; the side face of one side, far away from the rotating ring, of each reducing plate is fixedly connected with a rubber block; a rubber membrane is arranged in the rubber ring; each sealing unit comprises a swing rod, an air bag and sealing rings; and a mandrel is arranged in each of annular cavities. Connection between pipelines different in diameter and the joint is realized by rotating the rotating ring; water leakage at the position of the reducing interface is avoided by double sealing of the rubber blocks and the rubber membrane; the sizing interface is completely sealed under the cooperation of the sealing rings and third cavities; and the reducing two-way pipe joint is high in sealing performance and convenient to disassemble and assemble, and can be firmly connected with the pipelines.

The invention discloses a prefabricated crack hydraulic fracturing, roof-cutting and pressure-relief construction method and a drilling machine. The prefabricated crack hydraulic fracturing, roof-cutting and pressure-relief construction method comprises the steps that drilled holes are constructed in a roof above coal pillars at regular intervals, and a special drill bit is adopted to construct grooves in the axial direction at regular intervals; packers and pre-opening rubber membranes are inserted, thus the grooves are located in a packing section, and openings of the rubber membranes and the grooves are aligned, then water is injected into the packing section, the packers are pressurized by a manual pump, and whether the pressure in the packing section is decreased or not or whether thewater flows out of the packing section or not is observed; and a high-pressure pump is connected for fracturing, and prefabricated crack directional hydraulic fracturing, roof-cutting and pressure-relief operation is completed. Through the implementation mode, stress of roadway surrounding rock can be effectively lowered, roadway deformation is controlled, the safety and efficiency of resource exploitation are improved, and the problems of underground secondary pollution, poor safety and high cost which are caused by a traditional blasting technology are solved.

The invention relates to a pressure regulating valve which is simple in structure, high in pressure regulating accuracy and low in processing technology of a valve and filtering accuracy of an air source. The pressure regulating valve comprises a feedback cavity, a membrane upper cavity, a membrane lower cavity, an input port and an output port, wherein the feedback cavity and the membrane lower cavity are communicated through an output pressure feedback hole, the membrane upper cavity is internally provided with a throttling hole which is communicated with atmosphere, the membrane upper cavity and the membrane lower cavity are separated by a membrane, the inlet port and the output port are both communicated with the membrane lower cavity, a first through hole is formed between the feedback cavity and the membrane upper cavity, the opening size of the first through hole is regulated through a first flow regulating device, a second through hole is formed between the input port and the membrane lower cavity, and the opening size of the second through hole is regulated through a second flow regulating device. Compared with an existing precise pressure regulating valve, the pressure regulating valve disclosed by the invention only comprises one rubber membrane and three branch valve blocks, the flexibility is high, and the working temperature range is wide.

A strand 41, which is formed by twisting filaments 41a, is inserted through an untwisting device 48. The filaments 41a are untwisted and a predetermined space S is formed between the filaments. In this state, a rubber membrane coating is formed on the periphery of each filament 41a. Then, the filament is retwisted to form a rubber membrane coated strand 59. Therefore, the rubber membrane coated strand 59 has a predetermined strength against external force and is adequately adhered to the rubber so that the rubber membrane coated strand resists corrosion, absorbs vibration, and suppresses frictional heating. A belt and a ply, which use the strand, are provided.

This invention refers to an Automatic / Manual Device for Controlling Outflow of Water or any Fluid, with Mechanical Functioning and Easy Installation. It has a threadable intake nozzle for the inflow of water or any other fluid. The nozzle can be turned to direct the device as needed. Also, in the interior of the device there are two magnets with inverse polarity, a spring, two rubber membranes with orifices, a rubber membrane without an orifice, two supports for said membranes an air chamber, a manually-activated metal ring, a functioning mechanism with the following positions: ON-OFF, a double copper tube that is submerged in the container to be filled, a rubber hose connecting the double copper tube with the air chamber, and an activating mechanism with "manual", and "automatic" positions for operating the device. The functioning of this invention is provided for, with the objective being to shut off the flow of water or any other fluid once the container, tank, trough, barrel, tub, bathtub. toilet, pool, or other reservoir has been filled, by way of hydrostatic pressure exerted by the water container itself through the double copper tube connected to the air chamber by way of the rubber hose, with the necessary pressure being exerted to separate the magnets and thus close the fluid flow orifice.

The invention relates to the field of experimental equipment for testing soil mechanical properties in geotechnical engineering discipline, in particular to a spinning type coarse-grained soil triaxial experiment sample preparation device and sample preparation method. The spinning type coarse-grained soil triaxial experiment sample preparation device comprises a base, a counter-force frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap, wherein the base comprises an upper layer of cylindrical bosses, a middle layer of cylindricalbosses and a lower layer of cylindrical bosses with different diameters, and the counter-force frame comprises an annular bottom plate, a rigid counter-force column and a counter-force cover plate. The sample preparation method by utilizing the sample preparation device comprises the following steps: binding the rubber membrane on the base; arranging the annular bottom plate on the periphery of the upper layer of cylindrical bosses in a sleeving mode; installing the sample preparation cylinder; preparing the soil materials; filling the soil materials layer by layer and compacting; taking outa soil sample. According to the method, on the premise that the coarse-grained soil structure is not damaged, the coarse-grained soil sample used for the triaxial compression test can be prepared in ashort time, and the device is simple in structure, convenient to use, capable of accurately controlling layering and the total density of the coarse-grained soil, uniform in sample preparation, economical and practical.

The invention discloses a three-dimensional experimental system and experimental method for simulating a plastic zone of surrounding rock of a roadway. An axial loading cylinder of the system is connected with a support frame and a force transmission shaft, the lower end face of the force transmission shaft is connected with an axial compression sensor, an upper pressing head penetrates through a center through hole in the top of a shell of a side compression chamber, the bottom of the upper pressing head is connected with the upper end face of an experimental model, the top of the upper pressing head is connected with the axial compression sensor, a sealing ring is further connected between the upper pressing head and the through hole of the side compression chamber, an isolation rubber membrane encompassing the experimental model is connected between the upper pressing head and a lower pressing head, a hydraulic system is connected with the axial loading cylinder and the side compression chamber, and a multi-point displacement measuring system is connected through minisize high-precision multi-point displacement sensors in the data experimental model. The three-dimensional experimental system is more uniform in loading and high in loading intensity and meets model experiments in the deep high-stress environment under the three-dimensional condition, in particular to a high polarization stress field; real time data acquisition can be conducted, the measurement precision is high, and distribution characteristics and distribution rules of the plastic zone of the surrounding rock of the roadway can be effectively and accurately measured and simulated.

The invention discloses a dynamic triaxial testing machine servo-driven by an electric cylinder. According to the dynamic triaxial testing machine, a pressure chamber base is upwards connected with a pressure chamber top cover, and a pressure cavity is formed by a side wall cylindrical shell between the pressure chamber top cover and the pressure chamber base. A side direction measuring mechanism is installed on an inner steel column of an inner cavity of the pressure cavity. The pressure chamber base is provided with the servo electric cylinder, a vertical displacement sensor is arranged at the lower end of the servo electric cylinder, the upper end of the servo electric cylinder is connected with a sample base through a lead screw, a rubber membrane is disposed on the sample base, a pore water pressure sensor is mounted in a sample drainage pipe of the sample base, and a confining pressure sensor is installed in an air source passage of the pressure cavity. A sample cap is arranged on the upper end face of the rubber membrane. The sample cap is upwards connected with a vertical force transmission shaft, and an axial pressure sensor is installed on an axial force transmission rod. The dynamic triaxial testing machine resolves the problems that occupied area is large, noise is high, pollution is heavy and accuracy is not high enough in the prior art.