Concrete material mechanical test device

Abstract

The utility model relates to a concrete material mechanical test device which comprises a rack, a test bed arranged on the rack and a lifting driving device, the test bench further comprises a plurality of positioning blocks installed on the test bench through fasteners, a supporting plate arranged at the moving end of the lifting driving device, an extension shaft and a plurality of elastic pieces which are arranged on the supporting plate, a protective cover arranged on the elastic pieces, and a through hole formed in the protective cover and allowing the extension shaft to penetrate through. The pressing plate is arranged at the bottom end of the extension shaft and arranged in the protective cover, the end faces of the multiple positioning blocks are arranged opposite to the peripheral wall of the test piece, and the moving path of the protective cover passes through the multiple positioning blocks. The utility model has the advantages that the test piece is prevented from cracking and splashing, and the experiment safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of concrete performance detection, especially to a concrete material mechanics testing device. BACKGROUND

[0002] At present, the bridge durability problem has attracted people's high attention, and many highway research institutions and related professional colleges and universities have begun to conduct in-depth research on the durability problem of concrete bridge structure, and have achieved some results. The durability research of concrete structure is of great significance. On the one hand, the bridge with durability disease can be detected, evaluated and residual life predicted by scientific means, and reasonable and effective treatment measures are put forward according to the specific situation to improve the durability of the bridge, ensure the safety of the structure and prolong the service life of the structure. On the other hand, the durability design manual or guide of concrete structure can be developed by scientific method, so as to guide the design, construction and management and maintenance of newly-built bridge. In addition, through continuous summary of various factors affecting the durability of bridge structure, the overall level of bridge design can be improved to a certain extent, the construction quality of bridge and the level of daily management and maintenance can be improved. The durability research of concrete bridge can bring great economic benefits and good social influence, which will be beneficial to the development of transportation industry.

[0003] Before the durability test of the existing bridge reinforced concrete, the basic physical, chemical and mechanical properties need to be evaluated. At present, the strength test is the mechanical property evaluation of the core sample of the old bridge, and the commonly used test methods include uniaxial compression test and triaxial compression test. Among them, the uniaxial compression test of concrete core sample under different loading rates is carried out, the change rule of strength and deformation is analyzed, and the real-time monitoring of crack activity in concrete and surface strain field distribution is carried out by combining acoustic emission (AE) and digital image correlation method (DIC), the influence of loading rate effect on the crack propagation process and failure mode of concrete is analyzed; the triaxial compression test under different confining pressures is carried out, the strength, elastic modulus and deformation rule are analyzed; the mechanical property evolution rule of concrete under impact load is studied by combining SHPB test.

[0004] In the current uniaxial compression test process, when the concrete test piece is subjected to pressure, the collapse phenomenon may occur. In this process, if the operator observes, the splashing material fragments may cause harm to the workers. In order to protect the safety of the user, the existing compression testing machine is usually equipped with a basic protective shell. However, it is worth noting that not all compression testing machines are equipped with such protective measures, and some devices even completely lack the necessary protective facilities. In this case, the protective effect is obviously not ideal, and there is a great safety hazard. In addition, due to the deficiency of the protective measures, the practicability of these compression testing machines is also limited, and they cannot provide a safe and reliable operating environment for the experimenters. Utility model content

[0005] The utility model provides a kind of concrete material mechanics testing device to solve the problems existing in prior art above, it has the advantages of avoiding test piece splintering and improving experimental safety.

[0006] The above utility model purpose of the utility model is realized by the following technical solutions:

[0007] A kind of concrete material mechanics testing device, including rack, test table being set on the rack, and lifting drive device, further include multiple positioning blocks being installed on the test table by fastener respectively, the moving end of the lifting drive device is provided with supporting plate, elongated shaft and multiple elastic members being provided on the supporting plate, protective cover being provided on the multiple elastic members, the through hole being opened on the protective cover and being provided for the elongated shaft, and the pressure plate being provided at the bottom end of the elongated shaft and being arranged in the protective cover, the end surface of the multiple positioning blocks is arranged relative to the peripheral wall of test piece respectively, and the movement path of the protective cover passes through the multiple positioning blocks.

[0008] By adopting the above technical scheme, the test device can effectively prevent the splashing of fragments generated by the collapse of test piece during the compression test, thereby protecting the safety of the operator; during the test process, the test piece is placed on the test table and loaded by the lifting drive device, the multiple positioning blocks ensure that the test piece remains stable during the test process, preventing it from moving irregularly after being stressed, and the combination design of the elongated shaft and the elastic member allows the protective cover to move with the lifting of the elongated shaft, and ensures that the protective cover always covers above the test piece after the protective cover abuts against the test table, thereby avoiding the splashing of fragments. In addition, the through hole design on the protective cover allows the elongated shaft to be freely threaded, and the elongated shaft and the pressure plate can continue to be pressed relative to the protective cover, ensuring the smooth progress of the test. The setting of the pressure plate ensures that the test piece can be uniformly stressed when stressed, improving the accuracy of the test. The practicality and safety of the device have been significantly improved, providing a safer and more reliable operating environment for the experimenter.

[0009] The utility model further provides: multiple T-shaped grooves are opened on the test table, and the fastener includes a fastening bolt slidingly connected to the T-shaped groove and threaded through the positioning block, and a fastening nut threadedly connected to the fastening bolt and abutting against the surface of the positioning block.

[0010] By adopting the above technical scheme, the combination use of the fastening bolt and the fastening nut not only facilitates the disassembly and adjustment of the position of the positioning block, but also improves the carrying capacity of the test table. Moreover, during the test process, the displacement of the test piece caused by uneven stress can be effectively prevented, thereby ensuring the accuracy and repeatability of the test data.

[0011] The utility model further sets up: the end face of positioning block sets up the arc outer convex guide surface.

[0012] Through adopting above-mentioned technical scheme, under the condition of loosening fastening nut appropriately, can control fastener not easily slip relative T type groove, and also convenient for the rotation of positioning block, and utilize the guiding effect of guide surface again, can guide the end face rotation of positioning block and touch in the specimen surface, and can guide positioning hole rotation and separate, convenient for specimen installation.

[0013] The utility model further sets up: the extension shaft is close to the center arrangement of the supporting plate, and the plurality of elastic pieces are arranged equidistantly around the circumference of the extension shaft.

[0014] Through adopting above-mentioned technical scheme, ensure that specimen can be evenly pressed when being stressed, improve the accuracy of test.

[0015] The utility model further sets up: the elastic piece sets up at least two pressure springs of setting in order, and the helical direction of adjacent two pressure springs is opposite.

[0016] Through adopting above-mentioned technical scheme, ensure that specimen can be evenly pressed when being stressed, improve the accuracy of test.

[0017] The utility model further sets up: the transparent observation window is provided on the protective cover.

[0018] Through adopting above-mentioned technical scheme, it is convenient for tester to observe test condition.

[0019] Summarized above, the beneficial technical effect of the utility model is: the concrete material mechanics test device of the utility model not only solves the security risk problem existing in prior art, but also improves the accuracy of test and the convenience of operation, through the use of the device, can effectively carry out the mechanics performance test of concrete material, provides strong technical support for the research and application of relevant field. ACCURACY

[0020] Figure 1 It is the test device structure schematic drawing of the utility model.

[0021] Figure 2 It is the connecting relation schematic drawing between the elastic piece, extension shaft, protective cover and pressing plate of the utility model.

[0022] Figure 3 It is the connecting relation schematic drawing between the fastener, positioning block and test bench of the utility model.

[0023] In the figure, 1, rack; 2, test bench; 21, T-shaped groove; 3, lifting driving device; 31, driving motor; 32, belt transmission pair; 33, gear transmission pair; 34, eccentric mechanism; 35, connecting rod mechanism; 36, lifting guide arm; 4, fastener; 41, fastening bolt; 42, fastening nut; 5, positioning block; 51, guide surface; 6, supporting plate; 7, extension shaft; 8, elastic member; 9, protective cover; 91, observation window; 92, through hole; 10, pressing plate. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, purposes and effects of the utility model more clear and easy to understand, the utility model is further described below in combination with the drawings and specific embodiments.

[0025] REFERENCE Figure 1 and Figure 2 The utility model discloses a concrete material mechanics testing device, including rack 1, set up on rack 1 test bench 2, lifting driving device 3, install respectively through fastener 4 on test bench 2 multiple positioning block 5, set up on the mobile end of lifting driving device 3 supporting plate 6, set up on supporting plate 6 extension shaft 7 and multiple elastic member 8, set up on multiple elastic member 8 and have transparent observation window 91 protective cover 9, open in protective cover 9 and supply extension shaft 7 and pass through through -hole 92 of setting, and set up in the pressing plate 10 of extension shaft 7 bottom end and arrange in protective cover 9. Among them, the end surface of multiple positioning block 5 is arranged respectively relative to the peripheral wall of test piece, and the movement path of protective cover 9 passes through multiple positioning block 5.

[0026] The testing device can effectively prevent the splashing of fragments generated by the collapse of the test piece during the compression test, thereby protecting the safety of the operator. During the test, the test piece is placed on the test bench 2 and loaded by the lifting driving device 3. The multiple positioning blocks 5 ensure that the test piece remains stable during the test, preventing it from moving irregularly after being stressed. The combination of the extension shaft 7 and the elastic member 8 allows the protective cover 9 to move with the lifting of the extension shaft 7. After the protective cover 9 comes into contact with the test bench 2, it ensures that the protective cover 9 always covers the test piece above, thereby avoiding the splashing of fragments. In addition, the through hole 92 on the protective cover 9 allows the extension shaft 7 to pass freely, and the extension shaft 7 and the pressing plate 10 can continue to press relative to the protective cover 9, ensuring the smooth progress of the test. The setting of the pressing plate 10 ensures that the test piece can be uniformly stressed when stressed, improving the accuracy of the test. The practicality and safety of the device have been significantly improved, providing a safer and more reliable operating environment for the experimenter.

[0027] In addition, the extension shaft 7 is arranged close to the center of the support plate 6, and a plurality of elastic members 8 are arranged equidistantly around the circumference of the extension shaft 7. Meanwhile, the elastic member 8 is provided as at least two compression springs which are sequentially sleeved, and the spiral directions of the adjacent two compression springs are opposite. This structure ensures that the test piece can be uniformly pressed when stressed, and improves the accuracy of the test.

[0028] With reference to Figure 1 The lifting driving device 3 comprises a driving motor 31 arranged on the frame 1, a belt transmission pair 32 arranged on the output shaft of the driving motor 31, a gear transmission pair 33 arranged on the output shaft of the belt transmission pair 32, an eccentric mechanism 34 arranged on the output shaft of the gear transmission pair 33, a connecting rod mechanism 35 hinged to the eccentric shaft of the eccentric mechanism 34, and a lifting guide arm 36 hinged to the moving end of the connecting rod mechanism 35 and slidingly connected to the frame 1. The support plate 6 is arranged on the lifting guide arm 36.

[0029] With reference to Figure 3 In order to facilitate the adjustment of the positions of the positioning blocks 5, a plurality of T-shaped grooves 21 are arranged on the test bench 2, and the fastener 4 comprises a fastening bolt 41 slidingly connected to the T-shaped groove 21 and penetrating through the positioning block 5, and a fastening nut 42 threadedly connected to the fastening bolt 41 and abutting against the surface of the positioning block 5. Meanwhile, the end surface of the positioning block 5 is provided as an arc-shaped outwardly convex guide surface 51. The combination of the fastening bolt 41 and the fastening nut 42 not only facilitates the disassembly and adjustment of the position of the positioning block 5, but also improves the bearing capacity of the test bench 2, and can effectively prevent the displacement of the test piece caused by uneven stress during the test, thereby ensuring the accuracy and repeatability of the test data. When the fastening nut 42 is appropriately loosened, the fastener 4 can be controlled not to easily slide relative to the T-shaped groove 21, and the rotation of the positioning block 5 is facilitated, and the guide effect of the guide surface 51 can guide the end surface of the positioning block 5 to abut against the surface of the test piece and guide the positioning hole to rotate and disengage, thereby facilitating the installation of the test piece.

[0030] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A concrete material mechanical test device comprising a frame (1), a test table (2) arranged on the frame (1), and a lifting drive device (3), characterized in that: Also comprising a plurality of positioning blocks (5) mounted on the test bench (2) by fasteners (4) respectively, a supporting plate (6) arranged at the moving end of the lifting driving device (3), an extension shaft (7) and a plurality of elastic members (8) arranged on the supporting plate (6), a protective cover (9) arranged on the plurality of elastic members (8), a through hole (92) opened on the protective cover (9) and through which the extension shaft (7) is arranged, and a pressing plate (10) arranged at the bottom end of the extension shaft (7) and disposed in the protective cover (9), the end faces of the plurality of positioning blocks (5) are arranged opposite to the peripheral wall of the test piece respectively, and the moving path of the protective cover (9) passes through the plurality of positioning blocks (5).

2. The concrete material mechanical test device of claim 1, wherein: A plurality of T-shaped grooves (21) are opened on the test bench (2), the fastener (4) comprises a fastening bolt (41) slidingly connected on the T-shaped groove (21) and arranged through the positioning block (5), and a fastening nut (42) threadedly connected on the fastening bolt (41) and abutting against the surface of the positioning block (5).

3. The concrete material mechanical testing device of claim 1, wherein: The end face of the positioning block (5) is arranged as an arc-shaped outward convex guide surface (51).

4. The concrete material mechanical testing device of claim 1, wherein: The extension shaft (7) is arranged close to the center of the supporting plate (6), and the plurality of elastic members (8) are arranged at equal intervals around the periphery of the extension shaft (7).

5. The concrete material mechanical testing device of claim 1, wherein: The elastic member (8) is arranged as at least two compression springs which are sequentially sleeved, and the spiral directions of the adjacent two compression springs are opposite.

6. The concrete material mechanical testing device of claim 1, wherein: The protective cover (9) is provided with a transparent observation window (91).

Images