363 results about "Compressive test" patented technology

The invention discloses a temperature-controlled type unsaturated soil consolidometer, which can be used for geotechnical engineering measuring apparatus manufacture. The temperature-controlled type unsaturated soil consolidometer comprises a combined type pressure chamber with a bidirectional motion loading pressure piston, a diversion system, a displacement meter and laser metering equipment. Heat conducting oil is filled in a sandwich chamber between the outer side of the combined type pressure chamber and an outer-layer transparent sleeve; and moreover, the sandwich chamber is also provided with a thermoelectric couple and a heating rod to control the temperature inside the pressure chamber. When the temperature-controlled type unsaturated soil consolidometer is used, a filter paper method of suction measurement can be employed for measuring the suction of an unsaturated sample under different temperatures; unsaturated soil drying and watering cycle tests controlled under suction and compression tests under constant suction can be implemented to obtain the influence rules of the temperature on the soil-water characteristic and mechanical characteristic of unsaturated soil; andsoaking expansion deformation tests and expansion pressure tests under different temperatures can be implemented, and the expansion deformation of the unsaturated soil and the changing rules of the expansibility are respectively obtained through the displacement meter or a load sensor. The temperature-controlled type unsaturated soil consolidometer has the advantages of complete functions, simplestructure, convenient operation and high test precision.

The invention discloses an assembled variable dimension direct shearing compression apparatus for performing shearing test and compression test on multiple types of variable dimension rock soil samples. Each of the upper shearing box and the lower shearing box of the main body of the apparatus adopts an assembled variable dimension sample box suite consisting of at least two sets of sample box rigid components which can be connected with each other in a laminated mode, each set of sample box rigid component comprises a plurality of sample loading rings which are nested by one another, and each inner sample loading ring is axially limited by each outer sample loading ring in a single direction; the rigid components which form the upper shearing box and the lower shearing box respectively are anchored together, and one set of rigid component is arranged in each of the upper shearing box and the lower shearing box; and a rolling support matching structure is arranged on the outermost sample loading ring, water draining grooves are formed on the sample loading rings which are positioned at the bottom of the lower shearing box, and the water draining function can be closed according toa test requirement. The direct shearing test and the compression test of soil samples and soft rock, the direct shearing test of rock joints and the in-situ direct shearing test of soil bodies and the soft rock can be performed. The apparatus is easy to operation and convenient to maintain, dismount and assemble and has high environment adaptability.

The invention discloses a rock test piece die for triaxial compression test on an intermittent double-fracture rock. The rock test piece die for the triaxial compression test on the intermittent double-fracture rock comprises a base and a middle frame die arranged on the base, wherein a gland is arranged on the top of the middle frame die; the middle frame die consists of two modules which are symmetrically buckled together and are provided with semicircular slots; fixing lugs are symmetrically arranged on the side walls of the two modules respectively; a bolt for integrally fixing the two modules is sleeved with the fixing lugs in a penetrating manner; rectangular wide slots for enabling a rectangular steel sheet to penetrate through and be positioned between the two modules are formed in the middle parts of the two modules. Compared with the prior art, the rock test piece die has the advantages of simple structure, easiness in machining, convenience in dismounting and mounting and fracture positioning accuracy; the precision and the efficiency for preparing a intermittent fracture rock material test piece.

The invention relates to a shale reservoir compressibility evaluation method based on a support vector machine technology. The method comprises the following steps: (1) mineral composition quantitative analysis and uniaxial compressive test are firstly carried out; (2) logging characteristic parameters for recognizing a crack are extracted; (3) maximum and minimum horizontal principal stress in different layers is calculated through a combined spring model, and a stress sensitivity degree is then calculated; (4) a compressibility evaluation model is built; and (5) discrete layer stratum compressibility evaluation sample space is then built, and a relationship between a compressibility evaluation result and different response logging curves is subjected to correlation analysis. The shale reservoir compressibility evaluation method based on the support vector machine technology has the beneficial effects that compressibility influencing factors are considered perfectly, the shale gas reservoir compressibility model is built from three aspects of a brittleness index, a natural crack development degree and the stress sensitivity, insufficient consideration on the factors by the existing evaluation method is remedied, and the comprehensive ability of the shale to form a complex crack network during volume cracking can be better reflected.

A multi-bus semiconductor device and a method of its probing test perform the DC test for individual pads of a device while dealing with an adequate number of devices for simultaneous measurement based on the scheme of input / output pad number compressive test. The semiconductor device includes switch elements SW0-SW4 connected between input / output pads P0-P4 and a testing line L0 so that pads in an arbitrary combination, among the off-probe pads P1-P4 that are not made in contact with the tester probe Pr0, are selected for testing in correspondence to the combination of switch elements that are turned on. The input / output buffers of the pads under test are deactivated to block their internal current paths. The corresponding switch elements are turned on to connect the off-probe pads under test to the probe pad P0 that is made in contact with the tester probe Pr0, and the leak current of the probes is measured with the tester TS.

The invention relates to a dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method. The rheometer comprises a dynamic disturbance system, a frame, a guide rail, a lifting mechanism, a pressure chamber, a trolley, a temperature control system, an axial loading system, a confining pressure loading system, a measuring system, a control system and a computer and software system, a loading cylinder in the axial loading system can switch between a lead screw booster and a servo valve through a switching valve, a servo oil source, a servo valve and a loading cylinder are communicated through the switching valve when a conventional triaxial compression test is performed, the lead screw booster is communicated with the loading cylinder through the switching valve when a triaxial rheological test is performed, and rock samples are subjected to dynamic disturbance by the aid of a weight dynamic disturbance system or an impacting cylinder disturbance system. The rheometer effectively achieves rock triaxial loading and unloading rheological tests and conventional triaxial compression tests under the conditions of negative temperature and dynamic disturbance and is simple in integral structure principle, variable in function and high in applicability.

The invention relates to a shear strength measurement method, in particular to a method for measuring the shear strength of a discontinuous shear plane of a rock by utilizing three-shaft compression. The method comprises the following steps of: S100, preparing a rock sample required by a three-shaft compression test; S200, carrying out the three-shaft compression test on the rock sample, wherein an axial load is applied after confining pressure application till the rock sample is sheared and damaged and generates residual deformation; S300, measuring an angle between the shear plane and the horizontal direction; S400, setting a plurality of grades of confining pressures and carrying out the three-shaft compression test grade by grade; and S500, calculating positive stress and shear stress according to the test data and a rupture angle of the rock sample and fitting relation curves of the positive stress and the shear stress by utilizing a least square method to obtain the shear strength. The method has the beneficial effect that the residual deformation is utilized for replacing a cement pouring process to carry out shear test on the discontinuous shear plane of the rock sample, so that the shear strength of the discontinuous shear plane of the rock sample can be quickly and accurately obtained.

The invention relates to a test loading device, in particular to a tensile-shear test loading device with a flight structure. Compression bars are arranged between stand columns, the upper ends of the compression bars are extended to form an upper beam, a compression plate is arranged on the top ends of the stand columns, a lower beam is arranged on the bottom ends of the stand columns, an upper cross type joint is arranged between the compression bars on the bottom end of the upper beam, a lower cross type joint is arranged on the upper end of the lower beam between the compression bars; and a fixture is arranged between the upper cross type joint and the lower cross type joint. The test loading device provided by the invention can be used for converting pressure of a compression tester into tensile of a test piece or realizing shear force of the test piece through the action of the fixture, and can be used for a tensile or shear test of stiffened wall plates and similar structures without being provided with a special large loading tensile testing machine independently.

The invention discloses an assembled size-changeable double-face shear apparatus for performing a direct shear test on various size-changeable rock test samples. An upper shear box, a lower shear box and a middle shear layer are assembled size-changeable test sample box sleeve pieces consisting of stacked test sample box rigid components; each test sample rigid component comprises a plurality of embedded sample accommodating rings; the inner side sample accommodating rings is axially limited by the outer side sample accommodating rings in one direction; the rigid components forming the upper shear box and the lower shear box respectively are anchored together; rolling supporting matched structures are arranged on the outmost side sample accommodating rings of the rigid components in the upper shear box and the lower shear box; water drainage slots are formed in the sample accommodating rings at the bottom of the lower shear box; and the water drainage function is shut down according to a test requirement. The assembled size-changeable double-face shear apparatus can perform the double-shear-face direct shear test on a soil sample and soft rock, and a lateral-restrict-free single-shaft compression test on hard rock is easy to operate, convenient to maintain and detachable, has high environmental adaptability, and is suitable for being used in indoor and outdoor rock direct shear compression tests.

The invention relates to an in situ nanomechanical test and discloses a trans-scale micro-nano scale in situ tension compression mechanical property test platform which can be provided for an in situ tension / compression test and synchronous detection and synthesis of load / displacement signals. The platform is characterized in that: the platform comprises an accurate drive unit, a signal detection and control unit, three freedom degree manual adjustment unit, a clamp and a support unit. A direct current servomotor of the accurate drive unit is connected with a two-stage turbine worm mechanism through a coupling. The signal detection and control unit comprises a displacement sensor, a force transducer and an encoder forming a fixed connection with the current servomotor. The three freedom degree manual adjustment unit comprises a Y-direction manual adjustment knob connected with a lower layer main body base of a X-Y manual platform, a X-direction manual adjustment knob connected with an upper layer main body base of the X-Y manual platform and a Z-direction manual adjustment screw connected with a Z-direction adjustment lower wedge-shaped block, wherein the Z-direction adjustment lower wedge-shaped block forms a sliding match with a Z-direction adjustment upper wedge-shaped block.

The invention discloses a rock-soil pressure shear rheological testing machine and a testing method, the testing machine comprises a mainframe, a vertical loading system and a horizontal loading system are provided on the mainframe, and a servo oil pressure system controlled by a computer provides oil pressure to the vertical loading system and the horizontal loading system. According to the invention, a shearing apparatus, the horizontal loading system, a servo hydraulic system and an electric control system are added for realizing automation, control and accuracy of the tests. An original waste and old press mainframe and a vertical oil cylinder are used by the testing machine, thereby about 50% of cost can be saved, the testing machine aims at test materials such as rock, rock mass and soil / stone compound body, and can perform with the following tests: a compression test, a shearing test, a residual strength shearing test, a compression rheological and shearing rheological test.

The invention provides a triaxial tensile testing device and method for rocks. The triaxial tensile testing device comprises a follow-up interlocking device for enabling a loading platform to do freemovement along a piston of an actuator, a step type strip-shaped sliding rail and a multi-degree-of-freedom axial direct tensile clamp mounted in a triaxial chamber of a testing machine. The device provided by the invention is simple in structure, reasonable in design and simple and convenient to machine and produce, and use and operate; testing researches of triaxial tensile mechanical propertiesof the rocks under various complicated conditions can be conveniently, rapidly, stably and reliably finished by utilizing rock triaxial compression testing machines including an MTS815 type and the like, which only can be used for carrying out a rock test piece triaxial compression test, through the follow-up interlocking device and the multi-degree-of-freedom axial direct tensile clamp.

The invention relates to a concrete lever type tension-compression creep device provided with a static pulley. The concrete lever type tension-compression creep device consists of a support device, a loading device and a test piece connecting device; the concrete lever type tension-compression creep device adopts a double-level mechanism to realize tension and compression. The concrete lever type tension-compression creep device has the beneficial technical effects that the device is simple and reliable in structure, is capable of applying a continuous and constant load onto a test piece, and is small in floor space; and two test functions including a tension test and a compression test can be provided by a set of device.

The invention discloses a drop-hammer impact tension-compression integrated load test conversion device, and belongs to the technical field of test equipment. The device mainly comprises a drop-hammer test loader, a tension-compression integrated loading mechanism and a base, wherein the tension-compression integrated loading mechanism comprises an impact platform, a connecting guide rod, a fixed platform and a sliding platform. A compression loading mechanism and a tension loading mechanism are connected integrally to form the conversion device through the connecting guide rod, and drop-hammer impact load can be converted into compression or tension load; the test device is simple in structure construction and processing and manufacturing and convenient to assemble and mount, and compression and tension load requirements can be met simultaneously; compression tests, tension tests and shearing tests of engineering structure materials can be realized by adjusting local devices in pressed and tensile test areas, and dynamic mechanical property during impact load of actual engineering structure material can be simulated and tested.

The invention discloses a method for forecasting a weak plane formation collapse pressure equal yield density window. The method sequentially includes the steps: dividing a weak plane formation into a compact section and a crack section according to characteristics of the weak plane formation; testing the strength of a rock body and the strength of a weak plane of a rock by the aid of the triaxial compression test of the rock; inverting stress distribution and pore pressure distribution of surrounding rocks of a compact formation well by the aid of a fluid-solid coupling model, and determining the lower limit of the collapse pressure equal yield density of a compact formation according to Mohr-coulomb failure criteria; analyzing the failure state of the surrounding rocks of the weak plane formation well according to the rock weak plane failure criteria, and determining the lower limit and the upper limit of the collapse pressure equal yield density window of a crack formation; building a weak plane formation collapse pressure equal yield density window calculation model, substituting parameter values into the model and then determining the weak plane formation collapse pressure equal yield density window. The weak plane formation collapse pressure equal yield density window can be forecasted before drilling, so that drilling fluid density is reasonably selected, and wellbore instability is effectively stopped.

The invention discloses a compressionmeter of nondisturbed soil. A crossbeam is installed on the upper of the upright post of the bottom plating, a load bearing knife edge on the upper head face of the longitudinal girder and the groove on the bottom head face of the crossbeam are matched and fixed, the balancing counter poise is placed on the short longitudinal girder, the outer frame component comprising the load disk and the hook is equipped on the bottom of the long longitudinal girder; the bottom permeable stone, the spacing ring and the cutting ring are equipped in the hole of the foundation; the inner tube is composed of three petals and is inserted into the outer tube, the inner tube is matched with the excircle of the cutting knife, one ends of three fixed poles are respectively hinged joint with foundation, the other ends are equipped with top caps and press on the head face, when the soil body is pressed into the inner tube, the permeable stone is pressed on the soil body from the top cap, the top pressure cap is pressed on the permeable stone to form a pressure cabin component. The pressure cabin component is installed on the outer frame rack component bottom plating, the crossbeam and longitudinal girder location are adjusted, the pressure column is covered into the top pressure cap, the longitudinal girder is aimed at the top pressure cap center by pressure column, which form the nondisturbed soil compressionmeter. In order to provide nondisturbed soil sample for related research, the remoulded soil can be molded and pressed therein, and forms a sample without disturbance.

The invention relates to a nonlinear mechanical test equipment for a deep rock body, belonging to the mechanical test equipment for the deep rock body in geotechnical engineering. At present, the conventional rock body mechanical test comprises a unidirectional compression test, a unidirectional tension test, a triaxial compression test and a shear test. The force and the mechanical behavior in the action process of the deep rock body have the very close relations with the loading process. The conventional rock body mechanical test modes and equipments can't reflect the special mechanical behavior related to the loading process of the deep rock body. Therefore, the invention adopts the scheme of that each direction of three dimensions of a hydraulic loading device is provided with an independent hydraulic power control device, and combines the corresponding test piece fixture to provide the nonlinear mechanical test equipment which implements the composite stress test for the engineering rock body, particularly for the deep engineering rock body in order to implement the intensive study for the stress state of the engineering rock body in the process of tension and compression, intensity character of tension and shear composite state, constitutive relation and construction.

The invention discloses a laterally constrained rock uniaxial compression test device. An annular hollow cylindrical lateral confinement compression chamber is formed by two semi-cylindrical shells with the same shapes, screw holes are formed in the edges of the two semi-cylindrical shells, bolts penetrate through the screw holes to fix the two semi-cylindrical shells to form a hollow cylinder, the upper part and the lower part of the annular hollow cylindrical lateral confinement compression chamber are open, a T-shaped bearing plate is arranged on the upper opening, the T-shaped bearing plate is provided with a cylindrical heave to extend into the inner part of the annular hollow cylindrical lateral confinement compression chamber, the lower part of the annular hollow cylindrical lateral confinement compression chamber is arranged in a T-shaped port of the T-shaped bearing plate, two strain pieces are respectively installed on the surface of the two semi-cylindrical shells of the annular hollow cylindrical lateral confinement compression chamber, and the strain pieces are respectively connected with external resistance-type strain gages by leads. The invention provides the laterally constrained rock uniaxial compression test device, and uniaxial compression test of a rock sample can be carried out under annularly constrained condition by utilizing the device.

A hydraulic universal tester enabling to actively charge load on two ends of test piece is prepared for applying hydraulic cylinder with plunger-piston integrated action, connecting plunger to top frame formed by top horizontal beam and two smooth rods as well as flat plate of compression test bed, connecting piston to bottom frame formed by movable horizontal beam and two screw rods as well as bottom horizontal beam, using plunger to push top frame up and using piston to push bottom frame down for actively charging loads at two ends of test piece set between two said frames.

The invention provides an integrated testing device for tension, compression, shearing and torsion of a rock mass. The device comprises a device base, three groups of loading systems and a plurality of loading ends, wherein the loading systems comprise a transverse loading system, a longitudinal loading system and a vertical loading system; the transverse loading system comprises two transverse load supporting structures, two load sensors, a transverse load force transmission structure and two hydraulic jacks; the longitudinal loading system comprises two longitudinal load supporting structures, two load sensors, a longitudinal load force transmission structure and two hydraulic jacks; the vertical loading system comprises an upper load supporting beam, four pull rods, two load sensors anda vertical load force transmission structure; and the loading systems and the loading ends are connected through trapezoid prefabricated connectors. According to the device disclosed by the invention, a compression test, a tensile test, a tension-compression combined test and the like can be carried out on the rock mass, and the strength and the stress strain relation under the complex stress action of the rock mass can be accurately measured.

The invention discloses a water-containing gangue compression testing device and a testing method thereof. The water-containing gangue compression testing device comprises a steel barrel for storing gangues, wherein the steel barrel is divided into a plurality of layers from the whole height; a pressure sensor and a stay wire displacement sensor are arranged on each layer; the steel barrel is put on a testing machine to be subjected to a compression test so as to obtain a compression ratio and force magnitude relation of gangues on different-height layers; the same batch of gangues are tested again, but the difference is as follows: a fixed amount of water is injected at the height of a certain layer, and a compression test is carried out; the compression ratio and force magnitude relations of the gangues before and after the water is added are compared to obtain the influences on a compression process by the moisture content of the gangues on the certain layers; by that analogy, a plurality of times of tests are carried out to obtain the influences on the compression process by the moisture content of the gangues at different-height positions. The water-containing gangue compression testing device and the testing method thereof, disclosed by the invention, not only can be used for underground engineering of gangue mining with filling and the like, but also can be used for the fields of building and traffic engineering including geotechnical side slope stability analysis, gravel foundation treatment, roadbed deformation calculation and the like.

The invention discloses a device and a method for testing mechanical characteristics of agricultural materials. The device comprises a frame, a transmission system, tester accessories, and peripheral terminal equipment, wherein the transmission system is connected with one side of a movable cross-beam; and the peripheral terminal equipment includes a control main board, a display panel, a computer and a printer. The method comprises the following steps of: selecting corresponding test devices according to different requirements of tensile test, compression test, bend test and shear test; calibrating a force sensor and starting the tester and the computer; loading and recording a test sample; and inspecting the test parameter setting and checking to determine whether the test sample is valid. The invention can achieve accurate test of mechanical characteristics of agricultural materials by adopting small-range and high-accuracy force sensor, and the test device special for tensile test, compression test, bend test and shear test is designed. The test device and the software thereof are designed to achieve repeated loading of the materials, thus obtaining low-cycle mechanical characteristic data of agricultural materials.

The invention relates to an experiment method for observing three-dimensional square crack damage and a strain field as well as an experiment apparatus thereof. The method combines a particle image velocity measurement method and a compression test, employs artificial injection mold to produce a three-dimensional built-in square crack test piece, uniform tracer particles can be subjected to layered incorporation, the damage characteristic of the three-dimensional built-in square crack under single-shaft compression can be observed and the strain field visualization is realized, the understanding on the three-dimensional built-in crack fracture damage is increased, and the method is simple and easy to carry out, and cost is low. The experiment apparatus employs a brittle and transparent resin material to simulate the practical condition of the practical rock crack, and can determine the strain field by aiming at the three-dimensional built-in square crack test piece.

The invention discloses an assembled variable-dimension sample box suite capable of being used for direct shearing and compression test of geotechnical samples in various dimensions. The assembled variable-dimension sample box suite is composed of at least two sets of sample box rigid components which can be interconnected in a manner of stacking up, wherein each set of sample box rigid component is composed of a plurality of mutually nested sample holding rings; in each two adjacent sample holding rings, an external edge of the internal sample holding ring is jointed with an internal edge of the external sample holding ring, and the internal sample holding ring is axially limited in one way by the external sample holding ring; the outermost sample holding ring in one set of sample box rigid component is provided with a sliding support matched structure, moreover, each sample holding ring of the other set of sample box rigid component is provided with a drainage channel, so that the soil body test can have drainage or have no drainage; in the test, variation of dimension of the sample is realized by increasing or reducing the number of layers of the sample box rigid components and the number of the sample holding rings of the sample box rigid components, the assembled variable-dimension sample box suite is convenient to assemble and detach, and also can be used as a setting out device for various geotechnical test instruments.

The invention relates to a loading device and a loading method for a material double-shaft compression test, and belongs to the field of composite material complex loading tests. The device consists of an upper Y-shaped compression device and a lower Y-shaped compression device which are placed in an intersecting manner symmetrically with openings faced; the upper Y-shaped compression device (1) comprises a first loading arm (1-1), a second loading arm (1-2) and a top clamping end (1-3); the lower Y-shaped compression device (2) comprises a third loading arm (2-1), a fourth loading arm (2-2) and a bottom clamping end (2-3); right angles are formed between the first loading arm (1-1) and the second loading arm (1-2) and between the third loading arm (2-1) and the fourth loading arm (2-2); and the top clamping end (1-3) and the bottom clamping end (2-3) are respectively positioned on a bisector of the right angle. In comparison with the prior art, the device is simple to construct and convenient to maintain, double-shaft compression loading test can be realized by matching an all-purpose tester conveniently, and the testing cost is lowered.

The invention relates to a method for determining the shear yield surface and the volume yield surface of geotechnical materials, and relates to the technical field of measuring solid deformation. Inorder to judge stress yield of the geotechnical materials, the shear yield surface is fitted by a quadratic polynomial, and the volume yield surface is fitted by an ellipse and a hyperbola; parametricregression of the shear yield condition of the quadratic polynomial is conducted through a constant average stress triaxial test and a conventional triaxial compression test; parametric regression ofthe volume yield conditions of the ellipse and the hyperbola is conducted through an undrained constant average stress triaxial test and the conventional triaxial compression test; a regression curveof the yield surfaces is drawn according to the shear yield condition, the volume yield conditions and relevant parameters; and according to specific response values of the shear yield condition andthe volume yield conditions in engineering, whether shear yield or volume yield occurs in the geotechnical materials or not is evaluated. According to the method for determining the shear yield surface and the volume yield surface of the geotechnical materials, whether yield of the geotechnical materials exists after stress or not can be judged in engineering, corresponding measures are taken to prevent material damage and collapse accidents.

The invention discloses a lateral confinement condition adjustable rock-soil body vertical-compression aided testing device. The lateral confinement condition adjustable rock-soil body vertical-compression aided testing device comprises a base plate, a left side wall, a right side wall, a front side wall, a rear side wall, a thread, a bolt, a pressure transfer module, a displacement sensor and a comparison side table. The base plate and the side walls can aid six vertical-compression tests of indoor lateral confinement freeing, single-face lateral confinement, adjacent-face lateral confinement, opposite-face lateral confinement, three-face lateral confinement and complete-side lateral confinement conducted by a conventional press machine on a rock-soil body sample through flexible mounting and dismounting. Displacement sensors are directly distributed on the free face of the cubic sample, and real-time acquisition of displacement data of the rock-soil body sample in the vertical or horizontal direction can be achieved after computer connection through a data line. Compared with the prior art, the problem that the working condition of lateral confinement is relatively simple in implementation by adopting an existing technological means is creatively solved by adopting the design scheme.

The invention relates to a method for measuring compressive strength and anti-explosion capability of tubing. The method comprises the following steps of: preparing a tubing sample and more than three top plates; measuring the diameter D and length B of the inner hole of the tubing sample; selecting and determining the radius of the outer arc surface of each top plate according to the radius of the inner hole of the tubing sample; making the radius of the outer arc surface of each top plate is identical to the radius of the inner hole of the tubing sample, and making the length of each top plate greater than or equal to the length of tubing sample, and splicing the outer circular surfaces of all the top plates into a ring. The equipment comprises a bracket, wherein the bracket is fixedly connected with the rear end of a guide sleeve barrel; a plunger can be glidingly arranged in the guide sleeve barrel; the rear end of the plunger is connected with a piston rod of an oil cylinder; the body of the oil cylinder is arranged and fixed on the bracket; the front end of the plunger is provided with a regular polygonal cone or a regular polygonal prismoid or a cone or a cylinder. The method and equipment have the advantages of compact structure, simple operation, high working efficiency and convenient use.

The invention relates to an auxiliary compression tool for a thin plate material and an application method thereof. The auxiliary compression tool comprises a clamping plate and a fixed plate, wherein the clamping plate is connected with the fixed plate; a pressing plate is arranged between the clamping plate and the fixed plate; the fixed plate is provided with a fastening bolt for pressing the clamping plate by using the pressing plate; a pressing head for extruding a testing sample is arranged between the pressing plate and the clamping plate; the testing sample is placed between the clamping plate and the pressing plate and the pressing head is placed above the testing sample; the fastening bolt is adjusted and the pressing plate is uniformly squeezed through a resilient sheet to clamp the testing sample; finally, a test is finished through squeezing the testing sample through the pressing head. According to the auxiliary compression tool disclosed by the invention, the pressing amount of sheet material compression is improved, a traditional sheet material compression test head is prevented from being bent and losing the stability, and the stability of the sheet material compression is reduced; the size requirement of the sheet material compression testing sample enables the sheet material compression to be convenient and simple, so that a thin sheet material can be subjected to the stable compression test and is not bent to lose the stability, and the precision and the efficiency are improved.

The invention discloses a method for detecting compressive strength of concrete by body sampling. Once a method for detecting and assessing the practical compressive strength of a cast-in-place concrete member by using the compressive strengths of a reserved concrete standard curing test block and a curing test block under the same condition loses effectiveness, the prior detection method must adopt a rebound-ultrasonic or core drilling method to detect, but the detection error and detection expense of the two methods are large. The method comprises the following steps: pressing a die box which is embedded in the cast-in-place concrete member; when a template of the cast-in-place member is assembled, suspending and fixing the die box at the inside of the template; when concrete for the member is poured, forming a concrete compressive test piece in the die box; and when the concrete compressive test piece is cured to an age as the cast-in-place concrete member under the same condition, taking the die box out, then taking the concrete test piece in the die box out, cutting and smoothening the concrete test piece according to the prescribed size, and obtaining the compressive strength of the test piece on a pressure tester to be used for detecting and assessing the compressive strength of the cast-in-place concrete body. The method is applied to detecting and assessing the compressive strength of the concrete in the civil engineering.