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CN-116609515-B - Ultra-high performance concrete constraint shrinkage testing device

CN116609515BCN 116609515 BCN116609515 BCN 116609515BCN-116609515-B

Abstract

The invention relates to the technical field of ultra-high performance concrete constraint shrinkage testing, in particular to an ultra-high performance concrete constraint shrinkage testing device which comprises a rack and a testing mechanism, wherein the testing mechanism comprises a first clamp, a second clamp, a tension sensor, a plurality of strain gauges, a first bottom plate, a second bottom plate and a third bottom plate, the die mechanism comprises an upper die plate, a lower die plate, a plurality of side die plates and a die assembly, the lower die plate comprises a middle plate, a first end plate and a second end plate, the first end plate and the second end plate are movably inserted on two sides of the middle plate, the plate replacing mechanism comprises a sliding plate and a plate replacing assembly, the lifting mechanism comprises a plurality of lifting assemblies, the lifting assemblies are respectively arranged on two sides of the testing mechanism, and the testing mechanism, the die mechanism, the plate replacing mechanism and the lifting mechanisms are respectively connected with a controller.

Inventors

  • CUI BIN
  • JIN DONGYANG
  • GENG JIAHUI
  • DING YUFENG

Assignees

  • 新疆一方商品混凝土有限责任公司

Dates

Publication Date
20260508
Application Date
20230523

Claims (8)

  1. 1. The ultra-high performance concrete shrinkage restraint testing device comprises a frame (10) and is characterized by further comprising: The testing mechanism (1) is used for carrying out constraint shrinkage testing on an ultra-high concrete test piece, the testing mechanism (1) is arranged in the middle of the rack (10), the testing mechanism (1) comprises a clamp I (11), a clamp II (12), a tension sensor (13), a plurality of strain gauges (14), a bottom plate I (15), a bottom plate II (16) and a bottom plate III (17), the clamp I (11) comprises a clamp I (111), a clamp II (112) and a connecting plate I (113), the bottom of the clamp I (111) is connected with the surface of the bottom plate I (15), the clamp II (12) comprises a clamp III (121), a clamp IV (122) and a connecting plate II (123), the connecting plate II (123) is arranged between the clamp III (121) and the clamp IV (122), and the inserting block (6) is arranged at one ends of the clamp I (111), the clamp II (112), the clamp III (121) and the connecting plate IV (122). The die mechanism (2) is matched with the test mechanism (1) and used for pouring and forming a test piece, the die mechanism (2) comprises an upper die plate (21), a lower die plate (22), a plurality of side die plates (23) and a die assembly (24), slots (7) matched with the inserting blocks (6) are respectively formed in two ends of the side die plates (23), the lower die plate (22) comprises a middle plate (221), a first end plate (222) and a second end plate (223), the first end plate (222) and the second end plate (223) are movably inserted into two sides of the middle plate (221), and the die assembly (24) comprises a mounting plate (241), a first electric cylinder (242), a second electric cylinder (243), a third electric cylinder (244), a fourth electric cylinder (245), a distance sensor (246) and a plurality of guide sliding columns (247); The plate replacing mechanism (3) is matched with the testing mechanism (1) for use, the plate replacing mechanism (3) comprises a sliding plate (31) and a plate replacing assembly (32), and the plate replacing assembly (32) comprises a pushing electric cylinder (321), a frame (322), a supporting plate (323), a plurality of supporting frames (324) and a sliding plate (325) for reducing friction resistance of a test piece; The lifting mechanism (4) is used for lifting the concrete test piece, the lifting mechanism (4) comprises a plurality of lifting assemblies (41), the lifting assemblies (41) are respectively arranged at two sides of the testing mechanism (1), and the lifting assemblies (41) comprise a first pushing electric cylinder (411), a second pushing electric cylinder (412), a first pushing plate (413), a second pushing plate (414), a first supporting plate (415) and a second supporting plate (416); The test mechanism (1), the die mechanism (2), the plate replacing mechanism (3) and the lifting mechanism (4) are respectively connected with the controller (5); Starting an electric cylinder IV (245) to extend and drag the test piece to move upwards, starting a pushing electric cylinder I (411) and a pushing electric cylinder II (412) through a controller (5) and pushing a support plate I (415) and a support plate II (416) to the direction of the test piece; The controller (5) controls the fourth electric cylinder (245) to shrink, so as to drive the middle plate (221) and the test piece on the upper part of the middle plate to move downwards, and the test piece is supported by the first supporting plate (415) and the second supporting plate (416) on the two sides; The controller (5) starts the pushing electric cylinder (321) to push the sliding plate (325) to the upper part of the middle plate (221), and starts the electric cylinder IV (245) again to drive the sliding plate (325) to move upwards through the middle plate (221); the controller (5) controls the first pushing cylinder (411) and the second pushing cylinder (412) to shrink, so that the test piece is put down; the fourth control cylinder (245) drives the test piece to move into the first clamp (11) and the second clamp (12); the testing mechanism (1), the die mechanism (2), the plate changing mechanism (3), the lifting mechanism (4) and the controller (5) are respectively connected with the frame (10).
  2. 2. The ultra-high performance concrete shrinkage restraining test device according to claim 1, wherein the first connecting plate (113) is arranged between the first clamping plate (111) and the second clamping plate (112), one end of the first connecting plate (113) is connected with the surface of the first clamping plate (111), one end of the first connecting plate (113) far away from the first clamping plate (111) is connected with a plurality of first studs (114), the first studs (114) penetrate through the second clamping plate (112), and two ends of the first bottom plate (15) are respectively connected with the frame (10).
  3. 3. The ultra-high performance concrete constraint shrinkage testing device according to claim 1, wherein one end of the second connecting plate (123) is connected with the surface of the third clamping plate (121), one end of the second connecting plate (123) far away from the third clamping plate (121) is connected with a plurality of second studs (124), the second studs (124) penetrate through the fourth clamping plate (122), a plurality of sliding grooves (125) are formed in one side of the fourth clamping plate (122), sliding blocks are arranged in the sliding grooves (125) in a sliding manner, one end of the tension sensor (13) is connected with the second connecting plate (123), one end of the tension sensor (13) far away from the second connecting plate (123) is connected with the frame (10), the second bottom plate (16) is arranged at the lower part of the third clamping plate (121), the third bottom plate (17) is arranged at the lower part of the fourth clamping plate (122), and one ends of the second bottom plate (16) and the third bottom plate (17) are respectively connected with the frame (10).
  4. 4. The ultra-high performance concrete shrinkage constraint testing device according to claim 3, wherein the strain gauges (14) are respectively arranged on the inner side surfaces of the clamping plate I (111), the clamping plate II (112), the clamping plate III (121) and the clamping plate IV (122), and the strain gauges (14) and the tension sensor (13) are respectively connected with an external data acquisition device.
  5. 5. The ultra-high performance concrete shrinkage constraint testing device according to claim 4, wherein the testing mechanism (1) further comprises a first clamp cylinder (18), a second clamp cylinder (19), a first connecting seat (190) and a second connecting seat (191), the lower part of the first clamp cylinder (18) is connected with the first bottom plate (15), one end of the first clamp cylinder (18) is hinged with the first connecting seat (190), and one end of the first connecting seat (190) is connected with the second clamping plate (112); The lower part of the clamp electric cylinder II (19) is connected with the bottom plate III (17), one end of the connecting seat II (191) is connected with the sliding block, and one end of the connecting seat II (191) away from the clamping plate IV (122) is connected with the clamp electric cylinder II (19); the first clamp electric cylinder (18) and the second clamp electric cylinder (19) are respectively connected with the controller (5).
  6. 6. The ultra-high performance concrete shrinkage test apparatus according to claim 1, wherein the mounting plates (241) are respectively connected with the frame (10), the first electric cylinder (242) is arranged at the upper part of the mounting plates (241), the lower part of the first electric cylinder (242) penetrates through the mounting plates (241) to be connected with the upper template (21), the second electric cylinder (243) and the third electric cylinder (244) are arranged at one side of the first electric cylinder (242), the lower parts of the second electric cylinder (243) and the third electric cylinder (244) penetrate through the mounting plates (241) to be respectively connected with the corresponding side templates (23), the lower parts of the plurality of guide sliding columns (247) penetrate through the mounting plates (241) to be respectively connected with the corresponding side templates (23), the upper part of the guide sliding columns (247) is provided with a release preventing sheet, the upper part of the fourth electric cylinder (245) is connected with the lower template (22), the lower part of the fourth electric cylinder (245) is connected with the frame (10), and the distance sensors (246) are arranged at one side of the fourth electric cylinder (246), the fourth electric cylinder (245), the third electric cylinder (245) and the fourth electric cylinder (245) are respectively connected with the fourth electric cylinder (245) and the fourth electric cylinder (245).
  7. 7. The ultra-high performance concrete constraint shrinkage testing device according to claim 1, wherein the frame (322) is connected with the stand (10), the supporting plate (323) is arranged in the frame (322), two ends of the supporting plate (323) are respectively connected with the supporting frame (324) and the frame (322), the sliding plate (325) is arranged on the upper surface of the supporting plate (323) in a sliding mode, the sliding plate (325) is a polytetrafluoroethylene plate, an adsorption iron block (326) is arranged on one side of the sliding plate (325), one end of the pushing electric cylinder (321) is connected with the supporting plate (323), an electromagnet (327) is arranged at one end of the pushing electric cylinder (321), and the electromagnet (327) is connected with the controller (5).
  8. 8. The ultra-high performance concrete constraint shrinkage test device according to claim 2, wherein the first support plate (415) is located on one side of the first propulsion plate (413) away from the first propulsion cylinder (411), the first support plate (415) is hinged with the first propulsion plate (413), the second support plate (416) is located on one side of the second propulsion plate (414) away from the second propulsion cylinder (412), the second support plate (416) is hinged with the second propulsion plate (414), the first propulsion cylinder (411) is arranged on one side of the first connection plate (113), one end of the first propulsion cylinder (411) is connected with the first propulsion plate (413), a mounting table is arranged on the lower portion of the first propulsion cylinder (411), the lower portion of the mounting table is connected with the first bottom plate (15), and the first support plate (415) is located on the upper portion of the first connection plate (113); Propulsion electric jar two (412) set up in one side of connecting plate two (123), the lower part of propulsion electric jar two (412) is connected with frame (10), propulsion board two (414) are connected with the one end of propulsion electric jar two (412), propulsion board two (414) lower part seted up with draw force sensor (13) complex logical groove (417), layer board two (416) are located the upper portion of connecting plate two (123), propulsion electric jar one (411) and propulsion electric jar two (412) are connected with controller (5) respectively.

Description

Ultra-high performance concrete constraint shrinkage testing device Technical Field The invention relates to the technical field of ultra-high performance concrete shrinkage restraint testing, in particular to an ultra-high performance concrete shrinkage restraint testing device. Background The UHPC mechanical property of the ultra-high performance concrete, which is called as active powder concrete for short, is close to that of a steel structure, and the ultra-high performance concrete has excellent wear resistance and antiknock performance. Therefore, due to rapid development of concrete materials and construction technology, a large number of continuous casting technologies are increasingly commonly applied to practical engineering, the use amount of ultra-high performance concrete in the engineering is also continuously increased, deformation cracks (especially severe early day, the generation of early cracks is generally not the reason of structural load and construction load, and most of the cracks can be attributable to the result that the tensile stress generated by the restrained deformation of the concrete is too high), and the restraint can be divided into internal restraint and external restraint, wherein the external restraint is that the deformation (temperature shrinkage self-shrinkage, drying shrinkage and the like) of the concrete member is restrained by an adjacent concrete member or foundation and the like. External constraint can be divided into two constraint forms, one is end constraint, such as beams, frames and the like, deformation of a concrete member is constrained by adjacent members, the other is continuous constraint, such as plates, foundations and the like, common continuous constraint phenomena are concrete pavement slabs cast on a base layer, walls cast on the foundations and the like, axial constraint shrinkage test is an ideal means for evaluating early concrete constraint shrinkage test at present, and therefore, I propose an ultrahigh concrete constraint shrinkage test device based on the end constraint. Disclosure of Invention The invention aims to provide an ultra-high performance concrete shrinkage restraining testing device so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the ultra-high performance concrete shrinkage restraining testing device comprises a frame and further comprises: the testing mechanism is used for carrying out constraint shrinkage test on the ultra-high concrete test piece, and the shrinkage testing mechanism is arranged in the middle of the frame; The die mechanism is matched with the test mechanism and used for pouring and forming a test piece, and comprises an upper die plate, a lower die plate, a plurality of side die plates and a die assembly, wherein the lower die plate comprises a middle plate, a first end plate and a second end plate, and the first end plate and the second end plate are movably inserted into two sides of the middle plate; The plate replacing mechanism is matched with the testing mechanism for use and comprises a sliding plate and a plate replacing assembly; the lifting mechanism is used for lifting the test piece and comprises a plurality of lifting components which are respectively arranged at two sides of the testing mechanism; the test mechanism, the die mechanism, the plate changing mechanism and the lifting mechanism are respectively connected with the controller; The testing mechanism, the die mechanism, the plate changing mechanism, the lifting mechanism and the controller are respectively connected with the frame. Preferably, the testing mechanism comprises a first clamp, a second clamp, a tension sensor, a plurality of strain gauges, a first bottom plate, a second bottom plate and a third bottom plate; the clamp I comprises a clamp plate I, a clamp plate II and a connecting plate I, wherein the bottom of the clamp plate I is connected with the surface of a bottom plate I, the connecting plate I is arranged between the clamp plate I and the clamp plate II, one end of the connecting plate I is connected with the surface of the clamp plate I, one end of the connecting plate I, which is far away from the fixed plate I, is connected with a plurality of studs I, the studs I penetrate through the clamp plate II, and two ends of the bottom plate I are respectively connected with a rack; The clamp II comprises a clamp plate III, a clamp plate IV and a connecting plate II, wherein the connecting plate II is arranged between the clamp plate III and the clamp plate IV, one end of the connecting plate II is connected with the surface of the clamp plate III, one end of the connecting plate II, which is far away from the clamp plate III, is connected with a plurality of studs II, the studs II penetrate through the clamp plate IV, one side of the clamp plate IV is provided with a plurality of sliding grooves, sliding blocks are