CN107764649B - Tensile deformation testing device for concrete test piece at high temperature and deformation sensor clamp thereof - Google Patents
Tensile deformation testing device for concrete test piece at high temperature and deformation sensor clamp thereof Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a high-temperature middle-tensile deformation testing device for a concrete test piece and a deformation sensor clamp thereof, wherein the deformation sensor clamp comprises an arc-shaped elastic piece, fixed seats arranged at two ends of the elastic piece and a measuring rod arranged at the outer end of the fixed seat, the measuring rod is provided with a fire-resistant measuring end which is used for extending into a fire simulation furnace, and one side of the fixed seat is provided with a clamping hoop with a fastening screw and used for clamping a deformation sensor, a clamping rod with a top plate or a positioning rod; the device for testing the tensile deformation of the concrete test piece at high temperature comprises at least two deformation sensor clamps with the structure. The invention solves the problem that the deformation sensor can not directly test the deformation of the concrete test piece at high temperature.
Description
Technical Field
The invention relates to a deformation sensor clamp and a tensile deformation testing device in high temperature of a concrete test piece using the clamp in the field of concrete mechanical property test.
Background
With the rapid development of high-rise buildings, fire problems are increasingly prominent. In high-rise buildings, reinforced concrete structures account for more than 90%. The mechanical properties of the concrete as the main structural material are changed in a series after the fire disaster is in high temperature and high temperature, such as the decrease of strength and elastic modulus, the increase of deformation and the like. As a load-bearing and supporting system for a building, the structure must maintain a sufficient load-bearing capacity for a certain period of time in order for disaster-stricken personnel to evacuate safely, fire-fighters to extinguish fire and rescue casualties, etc. Therefore, to effectively prevent and control fire disaster from the aspect of building safety design, the performance attenuation law of structural materials such as concrete and the like under fire disaster must be deeply researched, which is not only a main index for scientific evaluation and performance research on the service capacity of concrete structures and materials thereof under fire disaster, but also an important basis for establishing a fire-resistant design method of the concrete structures and an excessive fire concrete structure damage evaluation and repair reinforcing method, in particular to strain response and destruction mechanism of the concrete under the coupling action of high temperature and tensile stress, and has important theoretical significance and application value for improving the fire-resistant design theory of the concrete. However, it is difficult to obtain accurate test data of deformation behavior of the concrete material at high temperature, and the existing test equipment and devices are all subjected to direct action of high temperature without causing fire, so that deformation values of the concrete test piece at high temperature cannot be measured, for example, a device for performing direct tensile test on concrete is disclosed in China patent with application name of "test piece, test piece forming die and complete set device" and publication number of CN106018044A, and although the device solves the direct tensile and deformation test problems of the concrete test piece at normal temperature, a deformation sensor in the device cannot be directly used for testing the deformation values of the test piece at high temperature. For this reason, in order to understand the information of the deformation behavior of concrete at high temperature, it is necessary to develop a new test device suitable for the purpose.
Disclosure of Invention
The invention aims to provide a deformation sensor clamp which solves the problem that in the prior art, a deformation sensor cannot be directly used for measuring the tensile deformation of concrete at high temperature; the invention also aims to provide a tensile deformation testing device for the concrete test piece at high temperature by using the deformation sensor clamp.
In order to solve the technical problems, the technical scheme of the deformation sensor clamp is as follows:
the deformation sensor clamp comprises an arc-shaped elastic piece, a fixing seat arranged at two ends of the elastic piece and a measuring rod arranged at the outer end of the fixing seat, wherein the measuring rod is provided with a fireproof measuring end which is used for extending into a fire simulation furnace, and one side of the fixing seat is provided with a clamping hoop which is used for clamping a deformation sensor and is provided with a top plate clamping rod or a positioning rod clamping hoop with a fastening screw.
Preferably, the measuring rod comprises a main limb arranged at the outer end of the fixing seat and a refractory nail made of refractory material arranged on the main limb.
Preferably, the main limb comprises a rectangular section connected with the outer end of the fixed seat and a cylindrical section connected with the rectangular section through a baffle ring, two lock pins are arranged on the two measuring rods, a first lock pin is arranged close to the fixed seat, the other lock pin is arranged close to the fixed seat, a first lock pin hole and a second lock pin hole are arranged on the rectangular section of the main limb of the other measuring rod opposite to the first lock pin and the second lock pin, and the lock pins can penetrate out and retract in the lock pin holes; the cylindrical section of the main limb of the measuring rod is sleeved with a disengaging spring and a sleeve, one end of the disengaging spring is connected with the baffle ring, the other end of the disengaging spring is arranged in the sleeve and is connected with the sleeve, and a movable mechanism formed by the disengaging spring and the sleeve can slide along the cylindrical section of the main limb; each sleeve is provided with a sleeve hanging buckle for a second lock pin on the other measuring rod to pass through in the direction of a second lock pin hole on the measuring rod where the sleeve is located, a main limb of the measuring rod is provided with a clamping hook for a first lock pin on the other measuring rod to pass through, the clamping hook is used for connecting a limiting spring, and a hanging hole for connecting the limiting spring is formed in the main limb of the measuring rod.
Preferably, the end part of the cylindrical section is clamped and connected with the refractory nails, and the end part of the cylindrical section is radially provided with heat insulation holes capable of reducing heat conduction.
The main limbs extend out of one trigger limb in opposite directions, and the two lock pins are arranged on the corresponding measuring rods through the trigger limbs.
The technical scheme of the high-temperature medium-tensile deformation testing device for the concrete test piece is as follows:
the device for testing the tensile deformation of the concrete test piece at high temperature comprises at least two deformation sensor clamps with the structure.
Preferably, the two clamping hoops of the deformation sensor clamp respectively clamp the deformation sensor and the clamping rod with the top plate.
Preferably, the two clamping hoops of the deformation sensor clamp two identical positioning rods, knife edge clamping grooves are formed in the positioning rods, and the blades at the tail ends of the two measuring rods of the extensometer are inserted into the corresponding knife edge clamping grooves.
Preferably, the two deformation sensor clamps are respectively inserted into two sides of the fire disaster simulation furnace, eight pulleys are arranged on the outer side of the fire disaster simulation furnace, and four limit springs are respectively connected with the deformation sensor clamps on two sides of the fire disaster simulation furnace through four groups of hanging holes and clamping hooks.
The beneficial effects of the invention are as follows: when the device is used, the deformation sensor and the clamping rod with the top plate are fixed in the fixing seat of the deformation sensor clamp, then the fireproof measuring end of the deformation sensor clamp is inserted into the fire simulation furnace, when the concrete test piece is stretched, the two measuring rods of the deformation sensor clamp are driven to do relative motion, and then the deformation sensor and the top plate are driven to do relative motion with linear change, so that the deformation of the test piece in the fire simulation furnace after high temperature and load coupling is transmitted to the deformation sensor outside the furnace through the deformation sensor clamp, and the problem that the deformation sensor cannot directly test the deformation of the concrete test piece in high temperature is solved.
Further, after the fireproof nails of the deformation sensor clamp are inserted into the fire simulation furnace through the structure of the deformation sensor clamp, the fireproof nails are propped against the concrete test piece through the limiting mechanism comprising the limiting springs, the clamping hooks, the hanging holes and the like, when the deformation value of the concrete test piece exceeds the deformation sensor range or the concrete test piece breaks at high temperature, the first locking pin extending part just retracts into the locking pin holes to enable the clamping hooks connected with the limiting springs to be released, the second locking pin extending part just retracts into the locking pin holes to enable the sleeve hanging buckles to be released, the release springs pressed in the sleeve drive the sleeve to stretch towards the shell of the fire simulation furnace to enable the deformation sensor clamp to be released from the test piece, and an over-travel protection mechanism comprising the locking pins on the trigger limbs of the deformation sensor clamp, the locking pin holes on the measuring rod, the clamping hooks, the sleeve hanging buckles, the limiting springs and the like plays a role in protecting the deformation sensor and the deformation sensor clamp from being damaged.
Further, the end clamping of the cylindrical section is connected with the fire-resistant nails, the damage to the fire-resistant nails can be replaced timely as required, the radial heat insulation holes capable of reducing heat conduction are formed in the end of the cylindrical section, the backward heat transfer amplitude is reduced, and the deformation sensor clamp and the deformation sensor are further protected.
The tensile deformation testing device is not only suitable for testing the deformation behavior of the concrete in the whole process of damage under the action of fire and tension load, but also suitable for testing the creep behavior of the concrete under the action of fire and constant tension load.
Drawings
FIG. 1 is a view showing the state of use of the tensile deformation testing apparatus for a concrete sample of example 1 according to the present invention at high temperature;
FIG. 2 is a schematic illustration of the engagement of the deformation sensor clamp of FIG. 1 with a deformation sensor;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic diagram showing the cooperation of the tensile deformation testing device and the fire simulation furnace in the high temperature of the concrete test piece in FIG. 1;
FIG. 5 is a schematic view of the structure of the concrete test piece of FIG. 1;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a schematic view of the upper clamp of FIG. 1;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a schematic view of a construction of the fire simulation furnace of FIG. 1;
FIG. 10 is a side view of FIG. 9;
FIG. 11 is a top view of FIG. 9;
fig. 12 is a schematic diagram showing the engagement of the deformation sensor clamp with the deformation sensor in embodiment 2.
Detailed Description
Example 1
The tensile deformation testing device in the high temperature of the concrete test piece of the embodiment is shown in fig. 1-11. The high-temperature medium-tensile deformation testing device for the concrete test piece comprises a pair of deformation sensor clamps 14, a deformation sensor 12, a clamping rod 13 with a top plate, a pulley E10, a limiting spring B1 (B1 '), a limiting spring B4 (B4') and the like which are arranged on two sides of the fire simulation furnace in a time division manner.
The deformation sensor clamp comprises elastic pieces A1 of arc structures, the elastic pieces A1 are all provided with fixing seats, a deformation sensor 12 is arranged on one fixing seat, a clamping rod 13 with a top plate is arranged on the other fixing seat, the fixing seats are clamping hoops A3 locked through screws A2 in the embodiment, and a measuring ball head of the deformation sensor is propped against the top plate. The measuring rods are two, namely a first measuring rod 15 arranged on a fixing seat with a deformation sensor, a second measuring rod 16 arranged on the fixing seat with a top plate clamping rod and corresponding to the first measuring rod 15, each measuring rod comprises a main limb A4 arranged at the outer end of the fixing seat and a fire-resistant nail A17 arranged on the main limb, the fire-resistant measuring end of each measuring rod is a fire-resistant nail, and the fire-resistant nail A17 is made of fire-resistant materials. The main limb A4 comprises a rectangular section connected with the outer end of the fixing seat and a cylindrical section connected with the rectangular section through a baffle ring, the fireproof nails A17 are clamped and connected with the cylindrical section, the fireproof nails of the cylindrical section are provided with heat insulation holes A16, and the heat insulation holes A16 are arranged along the radial direction of the end part of the cylindrical section and are used for reducing adverse effects of heat conduction on the deformation sensor clamp 14. The end of the refractory nail a17 contacting the test piece 6 is tapered (or blade-shaped) for accurate positioning and prevention of slipping. The main limb A4 of each measuring rod extends out of a trigger limb A15 in opposite directions, the end part of each trigger limb is respectively provided with two lock pins, the two lock pins on the first measuring rod 15 are called a first lock pin of the first measuring rod and a second lock pin of the first measuring rod, the two lock pins on the second measuring rod are called a first lock pin A7 of the second measuring rod and a second lock pin A10 of the second measuring rod, the rectangular section of each measuring rod main limb is provided with a lock pin hole for the corresponding lock pin to penetrate, the first lock pin hole and the second lock pin hole of the second measuring rod correspond to the first lock pin 15 and the second lock pin hole of the first measuring rod, and the first lock pin hole A8 and the second lock pin hole A11 of the first measuring rod correspond to the first lock pin A7 of the second measuring rod and the second lock pin A10 of the second measuring rod. The first lockpin of the first measuring rod 15 can extend and retract in the corresponding first lockpin hole on the second measuring rod and is matched with a clamping hook A6 connected with a limit spring B1 arranged on the rear side below, the second lockpin of the first measuring rod 15 can extend and retract in the corresponding second lockpin hole A11' on the second measuring rod 16 and is matched with a sleeve buckle A9 of the second measuring rod 16, a first measuring rod sleeve A14 is sleeved on a cylindrical section of the first measuring rod 15 adjacent to the second lockpin hole A11, and a second measuring rod sleeve is sleeved on a cylindrical section of the second measuring rod 16 adjacent to the trigger limb A15. The cylindrical section of the measuring rod is sleeved with a release spring A13, the release spring is arranged in the sleeve, one end of the release spring is connected with the sleeve, the other end of the release spring is fixed on a check ring A12, and the check ring A12 is a circular check ring. The measuring rods of the deformation sensor clamps are provided with limiting spring connection structures, in the embodiment, the limiting spring connection structures are spring hanging holes A5, the hanging holes A5 of the first measuring rod on the left deformation sensor clamp are connected with one end of a first limiting spring B1, the first limiting spring B1 is strapped in limiting grooves of two pulleys E10 at the rear upper part of the fire simulation furnace 5, and the other end of the first limiting spring B1 is clamped on a first lock pin A7 of a trigger limb of the second measuring rod of the right deformation sensor clamp through a connecting clamping hook A6; the hanging hole A5 of the first measuring rod on the right deformation sensor clamp is connected with one end of the second limiting spring B4, the second limiting spring B4 is straddled in the limiting grooves of the two pulleys E10 above the front part of the fire simulation furnace 5, and the other end of the second limiting spring B4 is clamped on the first lock pin A7 of the trigger limb of the second measuring rod of the left deformation sensor clamp through the connected clamping hook A6. The second measuring rods of the left deformation sensor clamp and the right deformation sensor clamp are also connected with the two sets of hanging hole clamping hooks through the front limiting springs (B1 'and B4') and the rear limiting springs. Four spacing springs cooperation use, are arranged in the concrete test piece high temperature in deformation test process and are used for throughout the clamping of the measuring stick of two deformation sensor anchor clamps about on the test piece to with the test piece deformation coordinate unanimity.
The working principle of the tensile deformation testing device of the concrete test piece at high temperature is shown in figure 1. The high-temperature medium tensile deformation testing device for the concrete test piece is used for a high Wen Zhangla testing device for the concrete test piece, and the high Wen Zhangla testing device for the concrete test piece comprises a tensioning system, a cooling system, a fire simulation system, a control and data acquisition system and the high-temperature medium tensile deformation testing device for the concrete test piece.
The tensioning system comprises a loading rod 1, a load sensor 2, a spherical hinge connecting rod 3, a clamping fixture 4 and the like.
The test piece 6 adopts an I-shaped structure, and is sequentially divided into a fire receiving section C1, a force transmission section C2 and a loading section C3 from the middle part to the two ends, wherein the fire receiving section C1 comprises a testing section C0. The fire section C1 is used for simulating the action of a fire suffered by the fire; the test section C0 is also a preset fracture section and is used for testing strength and deformation performance; the force transmission section is used for providing enough space for test operation; the loaded segment C3 is used for the application of a tensioning force. In order to avoid stress concentration at the variable cross section, cambered surface transition with radius of R is adopted between the test section C0 and the force transmission section C2 and between the force transmission section C2 and the loaded section C3. To ensure that the breaking of the test piece occurs at the test section C0 having the smallest cross section, the cross section of the test piece gradually increases from 2R of the test section C0 to 4R of the loaded section C3. The length, width and thickness of the test section C0 are all equal to 2R, and the thickness of each section is equal to 2R in order to facilitate the casting molding of the test piece. The load bearing section C3 is provided with a load bearing surface which forms an angle of 45 degrees with the axial direction of the test piece at the position close to the arc surface transition of the force transmission section C2.
The clamping jigs 4 are used in pairs, and respectively clamp the loaded sections C3 of the test piece 6 to form tensile force. The clamping fixture is formed by processing according to the structural form and the size of the end part of the test piece 6, the main beam D1, the shoulder plate D4 and the clamping beam D5 are connected into an integral structure by the back plate D3, a square conical opening clamping groove capable of clamping the test piece 6 is formed in the middle, and the size of the square conical opening clamping groove is larger than the loading section C3 of the test piece 6 for facilitating the installation of the test piece. A spherical hinge nest D2 is arranged at one side of the center of the main beam, which is close to the test piece 6, and the spherical hinge nest and the spherical hinge connecting rod 3 form a spherical pair. The inner side surface of the clamping beam D5 forms a 45-degree angle with the center line of the spherical hinge nest formed after the test piece 6 is clamped by the two clamping fixtures 4, and the loading surface of the clamping beam D5 is completely attached to the loaded surface of the test piece 6. When the test fixture is used, one clamping fixture 4 is connected with the load sensor 2 through the spherical hinge connecting rod 3, the load sensor 2 is connected with a jaw or a tensioning interface of the tester through the loading rod 1, and the other clamping fixture 4 is directly connected with the jaw or the tensioning interface of the tester through the spherical hinge connecting rod 3 to complete tensioning of the test piece 6. The loading surface of the test piece manufacturing die on the corresponding test piece loading section C3 is completely consistent with the loading surface inclination angle of the loading clamp clamping beam D5. The arrangement of the spherical pair and the consistency of the contact surface of the test piece and the loading clamp can ensure that bending moment, torque and stress concentration are not generated at the variable cross section of the test piece when the test piece is tensioned, and the success rate of the test is improved. The clamping beam D5 and the backboard D3 which are in direct contact with the test piece 6 are internally provided with a water circulation pipe D6 which is mutually communicated, and the water circulation pipe is provided with a water inlet and a water outlet.
The cooling system comprises a water cooler 9, a water outlet pipe 10, a water return pipe 11 and the like. The water chiller 9 is connected with a water inlet and a water outlet of the water circulation pipe D6 in the clamping fixture 4 through a water outlet pipe 10 and a water return pipe 11. The water-cooling machine is an air-cooled refrigerator integrated with components such as a water pump, a water tank, an evaporator, a compressor, a pressure controller, a filter, a liquid storage device, a condenser, a fan and the like. The water pump is connected with a water outlet pipe 10, a temperature sensor is arranged in a water return pipe 11, and the temperature sensor is connected with the controller 8 through a signal line. The water pump is a variable frequency centrifugal pump, when the measured backwater temperature is smaller than the set temperature, the water pump runs at low frequency, when the measured backwater temperature is higher than the set temperature, the running frequency of the water pump is gradually increased, and when the running frequency of the water pump reaches the limit or the measured backwater temperature is higher than the set temperature plus the bandwidth, the water cooling machine 9 is started so as to ensure that the rigidity of the clamping fixture 4 is not affected in the test.
The fire simulation system comprises a fire simulation furnace 5, a supporting mechanism thereof and the like. The fire disaster simulation furnace is formed by connecting two equal-sized half square column-shaped shells through a hinge E6 and a lock E11, the two half square column-shaped shells are symmetrical in structure, enclosure frameworks are formed by shells E1, and the shells are made of stainless steel. The two half square column-shaped shells are connected into a whole, and the hollow part of the rear of the fire simulation furnace 5 forms a hearth E5. And a heat insulation layer E2, a heat insulation layer E3 and a fire simulation cavity E4 are sequentially arranged between the shell E1 and the hearth E5 of the fire simulation furnace. The heat insulating layer is made of heat-resistant heat insulating material, and can be made of nano aerogel composite heat insulating felt for preventing heat loss. The heat insulating layer can be made of inorganic fireproof heat insulating materials, such as slag cotton, rock cotton, glass cotton, aluminum silicate cotton, ceramic fiber, etc., and is used for heat insulation. The fire disaster simulation cavity wall is made of refractory materials, a heating pipe E9 is arranged in the fire disaster simulation cavity wall and used for simulating and generating a fire disaster, and the heating pipe is connected with the controller through a wire. In order to measure the temperature in the hearth E5, a plurality of temperature sensors E8 are symmetrically arranged around the hearth E5, protection pipes are arranged outside the temperature sensors, and the temperature sensors are connected with the controller 8 through wires. The joint E7 is formed on the connecting surface of the two half square column-shaped shells, and a layer of high-temperature-resistant cotton felt is inlaid on the joint E7 surface, so that heat dissipation is prevented in a high-temperature test. The middle of the seam E7 is enlarged to form a deformation measuring seam E12, the dimensions of which are adapted to the requirements of the deformation sensor clamp 14 for the working space. The transverse section of the hearth is rectangular, the size of the transverse section is slightly larger than that of the force transmission section C2 of the test piece 6, the longitudinal length of the transverse section is equal to or slightly larger than that of the fire section C1 of the test piece, and the structural form of the transverse section is not only capable of meeting test requirements, but also beneficial to applying simulated fire actions to the fire section C1 of the test piece. The supporting mechanism is a set of movable mechanism composed of a rotating shaft E13, a connecting rod E14 and the like, one end of the connecting rod E14 is fixed on a shell E1 of a half body of the fire disaster simulation furnace 5, the other end of the connecting rod E14 is fixed on a bearing of the rotating shaft E13, the rotating shaft E13 is connected with a tester frame for applying tension load to a test piece 6 through the bearing and the other connecting rod E15, and the rotating shaft E13 is rotated by the connecting rod E14 to drive the fire disaster simulation furnace 5 to realize the displacement of the fire disaster simulation furnace 5. When the fire simulation test is required to be carried out on the test piece, the fire simulation furnace 5 is rotated around the rotating shaft E13 to face the fire receiving section C1 of the test piece 6, two half shells of the fire simulation furnace 5 are opened along the hinge E6, the fire receiving section C1 of the test piece 6 is just surrounded by the hearth E5, the fire simulation furnace 5 is locked by the lock E11, and after the contact part of the hearth and the test piece is sealed by the fireproof cotton felt, the simulated fire effect can be applied to the test piece according to a set program. Two sets of pulleys E10 are arranged at the corners of the adjacent outer side walls of the shell E1 where the hinge E6 and the lockset E11 are located and horizontally correspond to the deformation measuring seam E12, and the pulley blocks are used for supporting a first limiting spring B1 (B1') and a second limiting spring B4 and avoiding errors caused to deformation measuring values.
The control and data acquisition system consists of a load sensor 2, a control screen 7, a controller 8, a deformation sensor 13, a temperature sensor E8 and the like. The controller is respectively connected with the load sensor 2, the deformation sensor 13, the control screen 7, the water chiller 9, the fire simulation furnace 5, the testing machine and the like through cables. The control of the tensioning load, the temperature in the fire simulation furnace, the water chiller and the like and the acquisition of parameters such as the tensioning load, the deformation of a test piece, the temperature and the like are realized through a program and a control screen 7.
When a test piece is tested to deform, two deformation sensors are matched in pairs for use, the deformation sensors 12 and the clamping rods 13 with the top plates are installed on the deformation sensor clamps, the deformation sensors are adjusted to be in a test range, the fireproof nails A17 of the deformation sensor clamps are clamped on the test section C0 of the test piece 6, one ends of the limiting springs B1 are hung on hanging holes A5 of one set of deformation sensor clamps 14, the limiting springs bypass pulley blocks E10 on the fire simulation furnace 5, the other ends of the limiting springs are hung on the clamping hooks A6 to be clamped on the first locking pins A7 of the other set of deformation sensor clamps, the other limiting springs B4 are connected in the same way, and then the second set of connection between B1 'and B4' is completed. Under the coupling action of fire disaster and load, deformation sensor anchor clamps 14 can be with test piece test section C0 synchronous deformation and give deformation value transmission deformation sensor 12, first measuring stick, second measuring stick begin to be the splayed, when test piece deformation exceeds the range or the test piece fracture, the fire-resistant nail finally makes the trigger limb drive the outward extending part of lockpin and get back to the lockpin hole and in through deformation transmission, trip A6 and sleeve are hung and are detained A9 and are all disengaged from the lockpin, deformation sensor anchor clamps 14 are disengaged from test piece 6 under the effect of disengaging spring A13, a protection is all formed to deformation sensor anchor clamps 14 and deformation sensor 12.
Before deformation test, the accuracy of the tensile deformation test device in the high temperature of the concrete test piece composed of the deformation sensor clamp 14, the deformation sensor 12 and the like is calibrated integrally.
Example 2
Unlike embodiment 1, to meet the requirement that the deformation sensor employs a clip-type extensometer, the clamping hoops A3 of the deformation sensor clamp 14 are each used to clamp a positioning rod 18, and the ends of the positioning rods are each provided with a knife-edge clamping groove 19 that cooperates with the extensometer 17. When in use, the knife edges of the positioning blades at the front ends of the two measuring rods of the extensometer 17 are clamped in the clamping grooves, as shown in figure 12.
In other embodiments of the invention: strain gauges can be stuck on the elastic piece to replace the deformation sensor; the two deformation sensor clamps do not share a limit spring, for example, the corresponding measuring rod is directly connected to the fire simulation furnace through the limit spring; the first lock pin and the second lock pin on each measuring rod can also be directly connected to the corresponding main limb.
Claims (7)
1. Deformation sensor anchor clamps, its characterized in that: the fire-resistant measuring device comprises an arc-shaped elastic piece, fixed seats arranged at two ends of the elastic piece and a measuring rod arranged at the outer end of the fixed seats, wherein the measuring rod is provided with a fire-resistant measuring end which is used for extending into a fire simulation furnace, and the fixed seats are clamping hoops which are locked through screws; the measuring rod comprises a main limb arranged at the outer end of the fixed seat and a refractory nail made of a refractory material arranged on the main limb; the main limb comprises a rectangular section connected with the outer end of the fixed seat and a cylindrical section connected with the rectangular section through a baffle ring, two lock pins are arranged on the two measuring rods, a first lock pin is arranged close to the fixed seat, the other lock pin is a second lock pin, a first lock pin hole and a second lock pin hole are arranged on the rectangular section of the other main limb opposite to the first lock pin and the second lock pin, and the lock pins can penetrate out and retract in the lock pin holes; the cylindrical section of the main limb is sleeved with a release spring and a sleeve, one end of the release spring is connected with the baffle ring, the other end of the release spring is arranged in the sleeve and connected with the sleeve, and a movable mechanism formed by the release spring and the sleeve can slide along the cylindrical section of the main limb; each sleeve is provided with a sleeve hanging buckle for a second lock pin on the other measuring rod to pass through in the direction of a second lock pin hole on the measuring rod where the sleeve is located, a main limb is provided with a clamping hook for a first lock pin on the other measuring rod to pass through, the clamping hook is used for connecting a limiting spring, and the main limb is provided with a hanging hole for connecting the limiting spring.
2. The deformation sensor clamp according to claim 1, wherein: the end part of the cylindrical section is clamped and connected with the refractory nails, and heat insulation holes capable of reducing heat conduction are radially formed in the end part of the cylindrical section.
3. The deformation sensor clamp according to claim 1, wherein: the main limbs extend out of one trigger limb in opposite directions, and the two lock pins are arranged on the corresponding measuring rods through the trigger limbs.
4. The device for testing the tensile deformation of the concrete test piece at high temperature is characterized in that: a deformation sensor clamp comprising at least two of the deformation sensor clamps of any one of claims 1-3.
5. The device for testing tensile deformation of a concrete sample at high temperature according to claim 4, wherein: the two clamping hoops of the deformation sensor clamp respectively clamp the deformation sensor and the clamping rod with the top plate.
6. The device for testing tensile deformation of a concrete sample at high temperature according to claim 4, wherein: the two clamping hoops of the deformation sensor clamp two identical positioning rods, knife edge clamping grooves are formed in the positioning rods, and the blades at the tail ends of the two measuring rods of the extensometer are inserted into the corresponding knife edge clamping grooves.
7. The device for testing tensile deformation of a concrete sample at high temperature according to claim 4, wherein: the two deformation sensor clamps are respectively inserted into two sides of the fire disaster simulation furnace, eight pulleys are arranged on the outer side of the fire disaster simulation furnace, and four limit springs are respectively connected with the deformation sensor clamps on two sides of the fire disaster simulation furnace through four groups of hanging holes and clamping hooks.
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| CN108639957A (en) * | 2018-07-26 | 2018-10-12 | 国网辽宁省电力有限公司本溪供电公司 | A kind of defeated, distribution operation crane tool experiment auxiliary device |
| CN114720277A (en) * | 2022-03-29 | 2022-07-08 | 浙江工业大学 | Ring tensile test platform |
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