A continuous loading device for studying creep characteristics under long-term load

Abstract

The present invention discloses a continuous loading device for studying creep characteristics under long-term load, comprising a first bearing plate, a second bearing plate and a support plate arranged in parallel with each other, the second bearing plate is located between the first bearing plate and the support plate, at least two guide rods parallel to each other are connected between the first bearing plate and the support plate, one end of the guide rod is fixedly connected to the first bearing plate, and the other end is fixedly connected to the support plate, the guide rod passes through the second bearing plate, and the second bearing plate and the guide rod are slidably matched, and a plurality of jacks are evenly arranged between the first bearing plate and the second bearing plate; the bottom of the anchor sleeve is provided with an external thread, the second bearing plate is provided with a through hole corresponding to the anchor sleeve, the bottom end of the anchor sleeve passes through the through hole, the bottom of the anchor sleeve is threadedly connected with an upper nut and a lower nut respectively located on both sides of the second bearing plate, one end of the pulling member sample is fixedly connected to the first bearing plate, and the other end is fixedly connected to the top of the anchor sleeve. The present invention is easy to use.

Description

Technical Field

[0001] The invention relates to the technical field of loading test devices, in particular to a continuous loading device for studying creep characteristics under long-term load action. Background Art

[0002] The commonly used loading methods for the long-term performance test of traditional bar-concrete pull-out components are stacking method, lever method, jack loading method and screw method. The stacking method has stable load, but due to space limitations, it requires a large amount of heavy objects and has limited loading level; the screw method relies on a reaction device to provide loading and uses a universal testing machine to control the load size. The disadvantage is that the load decreases over time due to the creep effect of the component; the lever method loading is based on the stacking method. By increasing the length of the lever arm, the volume of the heavy object can be reduced, but the disadvantage is that the entire device still needs to occupy a large space, and the specimen under the lever method undergoes brittle failure. Due to the sudden disappearance of the force at one end, the entire device will suddenly overturn, posing a great safety hazard. Fixing the device can certainly solve this problem, but it will inevitably damage the integrity of the constant temperature and humidity chamber; the disadvantage of the existing jack loading method is that after calibrating the load size through a force sensor, it is impossible to avoid the situation where the load is weakened after the creep of the device and component. Similarly, if the component is suddenly damaged, part of the device will collapse, which is very dangerous. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a continuous loading device which is convenient to use for studying creep characteristics under long-term load.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a continuous loading device for studying creep characteristics under long-term load, comprising a first load-bearing plate, a second load-bearing plate and a support plate which are arranged in parallel with each other, the second load-bearing plate is located between the first load-bearing plate and the support plate, at least two guide rods which are parallel to each other are connected between the first load-bearing plate and the support plate, one end of the guide rod is fixedly connected to the first load-bearing plate, and the other end is fixedly connected to the support plate, the guide rod passes through the second load-bearing plate, and the second load-bearing plate and the guide rod are slidably matched, a plurality of jacks are evenly arranged between the first load-bearing plate and the second load-bearing plate, one end of the jack is fixedly connected to the first load-bearing plate, and the other end is fixedly connected to the second load-bearing plate; an external thread is arranged at the bottom of an anchor sleeve, the second load-bearing plate is provided with a through hole corresponding to the anchor sleeve, the bottom end of the anchor sleeve passes through the through hole, the bottom of the anchor sleeve is threadedly connected with an upper nut and a lower nut which are respectively located on both sides of the second load-bearing plate, one end of a pulling member sample is fixedly connected to the first load-bearing plate, and the other end is fixedly connected to the top end of the anchor sleeve.

[0006] Preferably, it further comprises a plurality of positioning rods, one end of each positioning rod is connected to the second load-bearing plate via bolts, and the other end of each positioning rod is connected to the support plate via bolts.

[0007] Preferably, the jack is a mechanical jack; a pressure sensor electrically connected to a real-time monitoring device is sandwiched between the jack and the first bearing plate.

[0008] Preferably, the pulling member sample is a reinforcement bar-concrete pulling member, which includes a concrete block and a reinforcement bar passing through the first bearing plate, the bottom of the reinforcement bar is inserted into the anchor sleeve, the bottom of the reinforcement bar is fixedly connected to the anchor sleeve, the concrete block is fixedly arranged on the top of the reinforcement bar, and the concrete block is located on the side of the first bearing plate away from the second bearing plate.

[0009] Compared with the prior art, the present invention has achieved the following technical effects:

[0010] The continuous loading device for studying creep characteristics under long-term loads of the present invention is easy to use. The continuous loading device for studying creep characteristics under long-term loads of the present invention extends two bearing plates on both sides of the component and directly applies loads using a mechanical jack, which not only saves space for stacking heavy objects but also saves space for lever arms; the continuous loading device for studying creep characteristics under long-term loads of the present invention is suitable for long-term performance tests of bar-concrete pull-out components and durability tests of bar-concrete pull-out components under load and environmental effects. The present invention installs a force sensor at the jack force application point for real-time monitoring, so that the load is stable and the load weakened by the creep of the device and component can be added at any time; secondly, a positioning rod and four guide rails are set at the end of the pull-out component, which can well align the first bearing plate, the second bearing plate and the support plate and fix the distance between them, thereby avoiding eccentric damage to the component, obtaining the expected results and effectively controlling unnecessary variables in the experiment; finally, in terms of safety, the support plate plays a role in preventing the bearing plate from popping out. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of a continuous loading device for studying creep characteristics under long-term load in the present invention;

[0013] Among them: 100, continuous loading device for studying creep characteristics under long-term load; 1, first load-bearing plate; 2, pressure sensor; 3, guide rod; 4, jack; 5, second load-bearing plate; 6, support plate; 7, positioning rod; 8, upper nut; 9, anchor sleeve; 10, concrete block; 11, reinforcement rod. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a continuous loading device which is convenient to use for studying creep characteristics under long-term load.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown: This embodiment provides a continuous loading device 100 for studying creep characteristics under long-term load, including a first bearing plate 1, a second bearing plate 5 and a support plate 6 arranged in parallel to each other, the second bearing plate 5 is located between the first bearing plate 1 and the support plate 6, four mutually parallel guide rods 3 are connected between the first bearing plate 1 and the support plate 6, one end of the guide rod 3 is fixedly connected to the first bearing plate 1, and the other end is fixedly connected to the support plate 6, the guide rod 3 passes through the second bearing plate 5, and the second bearing plate 5 and the guide rod 3 are slidably matched; This embodiment of the continuous loading device 100 for studying creep characteristics under long-term load also includes two positioning rods 7, one end of the positioning rod 7 is connected to the second bearing plate 5 by bolts, and the other end is connected to the support plate 6 by bolts. Through the positioning rods 7 and the four guide rods 3, the first bearing plate 1, the second bearing plate 5 and the support plate 6 can be well aligned and the distance between them can be fixed, so as to avoid eccentric damage of the components, obtain the expected results and effectively control the variables not needed in the experiment.

[0018] Two jacks 4 are evenly arranged between the first bearing plate 1 and the second bearing plate 5. The jacks 4 are mechanical jacks 4. One end of the jack 4 is fixedly connected to the first bearing plate 1, and the other end is fixedly connected to the second bearing plate 5. A pressure sensor 2 electrically connected to the real-time monitoring device is sandwiched between the jack 4 and the first bearing plate 1. The mechanical jack 4 is directly used to apply the load, which not only saves the space for stacking heavy objects but also saves the space for the lever arm. The continuous loading device 100 for studying the creep characteristics under long-term load in this embodiment is suitable for long-term performance tests of bar-concrete pull-out components, and also for durability tests of bar-concrete pull-out components under load and environmental effects. The present invention installs a force sensor at the force application point of the jack 4 for real-time monitoring, so that the load is stable and the load weakened by the creep of the device and components can be added at any time.

[0019] The bottom of the anchor sleeve 9 is provided with an external thread, and the second bearing plate 5 is provided with a through hole corresponding to the anchor sleeve 9. The anchor sleeve 9 passes through the through hole. The bottom of the anchor sleeve 9 is threadedly connected with an upper nut 8 and a lower nut respectively located twice on the second bearing plate 5. One end of the pulling member sample is fixedly connected to the first bearing plate 1, and the other end is adhered to the top of the anchor sleeve 9. The pulling member sample is a reinforcing bar-concrete pulling member. The reinforcing bar-concrete pulling member includes a concrete block 10 and a reinforcing bar 11 passing through the first bearing plate 1. In this embodiment, the inner diameter of the anchor sleeve 9 is slightly larger than the diameter of the reinforcing bar 11. The bottom of the reinforcing bar 11 is inserted into the anchor sleeve 9, and the bottom of the reinforcing bar 11 is adhered to the inner wall of the anchor sleeve 9. The concrete block 10 is fixed to the top of the reinforcing bar 11, and the concrete block 10 is located on the side of the first bearing plate 1 away from the second bearing plate 5. During anchoring, the device is as Figure 1 Place it vertically on the flat ground, control the distance between the second bearing plate 5 and the support plate 6 by the positioning rod 7, and fix the anchor sleeve 9 by the upper nut 8. After anchoring, remove the positioning rod 7, place the device flat, tighten the lower nut on the anchor sleeve 9 to transfer the force of the jack 4 on the second bearing plate 5 to the anchor sleeve 9, and then apply it to the rib-concrete pulling member, so that the anchor sleeve 9 integrates the two functions of anchoring the rib 11 and adding continuous force.

[0020] The continuous loading device 100 for studying creep characteristics under long-term load in this embodiment has a simple structure, is easy to install, can apply a large load range, is not limited by the space required for the lever arm, and can achieve both anchoring and loading functions at any location, greatly improving efficiency.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A continuous loading device for studying creep characteristics under long-term load, characterized in that: The cam is a platform for mounting a plurality of cams on a plurality of support members, each of which is connected to a plurality of support members on a plurality of support members. The cam is a platform for mounting a plurality of cams on a plurality of support members. The cam is a platform for mounting a plurality of cams on a plurality of support members. The cam is a platform for mounting a plurality of cams on a plurality of support members. The cam is a platform for mounting a plurality of cams on a plurality of support members. It also includes a plurality of positioning rods, one end of which is connected to the second bearing plate by bolts, and the other end is connected to the support plate by bolts; the jack is a mechanical jack; a pressure sensor electrically connected to a real-time monitoring device is provided between the jack and the first bearing plate; the pulling member sample is a tendon-concrete pulling member, the tendon-concrete pulling member includes a concrete block and a tendon passing through the first bearing plate, the bottom of the tendon is inserted into the anchor sleeve, the bottom of the tendon is fixedly connected to the anchor sleeve, the concrete block is fixedly provided on the top of the tendon, and the concrete block is located on the side of the first bearing plate away from the second bearing plate.

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