Supporting device for fatigue test of concrete slab

Abstract

The utility model discloses a supporting device for a fatigue test of a concrete slab, which belongs to the technical field of auxiliary devices for fatigue tests and comprises a connecting component, a supporting component and a connecting component. The two supporting strips are connected with the connecting assembly, the top surfaces of the supporting strips are cambered surfaces, the top surfaces of the supporting strips are used for supporting a concrete slab, and the supporting strips have elasticity. According to the utility model, a line supporting environment can be simulated, the test requirement is closer, and the accuracy of a test result is improved; meanwhile, overlarge local stress at the line contact position can be avoided, and the concrete cracking phenomenon at the contact position is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fatigue test auxiliary devices, in particular to a support device for the fatigue test of concrete slabs. Background Technique

[0002] The purpose of the concrete fatigue test is to study parameters such as the deformation amount under repeated load by simulating real working conditions. During the fatigue test of the concrete slab, a steel frame is usually set on the lower support table of the fatigue testing machine, the concrete slab is placed on two support bars of the steel frame, and the loading test is carried out on the concrete slab through the loading head at the top. This kind of support device can meet the requirements in daily engineering projects, but the scientific research project has extremely high requirements for the accuracy of test results. Since the bottom support bar has a certain width (generally about 10 cm), placing the concrete slab on the support bar cannot accurately simulate the line support environment of the concrete slab, thus reducing the accuracy of the test results.

[0003] Therefore, a support device for the fatigue test of concrete slabs is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a support device for the fatigue test of concrete slabs, aiming to solve or improve at least one of the above technical problems.

[0005] To achieve the above purpose, the utility model provides the following scheme: The utility model provides a support device for the fatigue test of concrete slabs, including:

[0006] A connection component for connecting with the bottom support table of the testing machine;

[0007] Two support bars, the support bars are connected with the connection component, the top surface of the support bar is an arc surface, the top surface of the support bar is used to support the concrete slab, and the support bar has elasticity.

[0008] Preferably, the connection component includes two support plates, the support plates are fixedly connected with the bottom support table of the testing machine, there is a gap between the support plates and the bottom support table of the testing machine, and the two support plates are respectively connected with the two support bars.

[0009] Preferably, the support bar and the support plate are detachably connected by a plurality of bolts.

[0010] Preferably, a plurality of first through holes are formed in the support plate, and a plurality of second through holes are formed in the support bar. The second through holes penetrate through the top and bottom of the support bar. The plurality of first through holes and the plurality of second through holes are respectively arranged corresponding to the plurality of bolts. The screw rod of the bolt sequentially penetrates through the first through hole and the second through hole and is threadedly connected with a nut, and the nut contacts the bottom of the support plate.

[0011] Preferably, a plurality of avoidance grooves are formed in the top of the support bar. The plurality of avoidance grooves are arranged corresponding to and communicated with the plurality of second through holes. The head of the bolt is located in the avoidance groove, and the height of the head of the bolt is lower than the height of the avoidance groove.

[0012] Preferably, the surface of the support bar connected to the support plate is a flat surface.

[0013] The present utility model discloses the following technical effects: By setting the top surface of the support bar as an arc surface, when the support bar contacts the concrete slab, it can imitate the line support environment, be closer to the test requirements, and improve the accuracy of the test results; at the same time, since the support surface of the support bar is an arc surface and has a certain elasticity, when loading the concrete slab, it can avoid excessive local stress at the line contact position and reduce the phenomenon of concrete cracking at the contact position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic installation structure diagram of the support bar and the support plate in the present utility model;

[0017] Figure 3 is a schematic radial cross-sectional diagram of the support bar in the present utility model;

[0018] Figure 4 is a top view of the support bar in the present utility model.

[0019] In the figure: 1, support bar; 2, support plate; 3, bolt; 4, first through hole; 5, second through hole; 6, nut; 7, avoidance groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Referring to Figures 1-4 , the present invention provides a support device for fatigue testing of concrete slabs, including:

[0023] A connection component for connecting with the bottom support platform of the testing machine;

[0024] Two support bars 1, the support bar 1 is connected to the connection component, the top surface of the support bar 1 is an arc surface, the top surface of the support bar 1 is used to support the concrete slab, and the support bar 1 has elasticity;

[0025] In this embodiment, the support bar 1 is made of a nylon rod, and its main raw material is nylon (polyamide, PA), which has high wear resistance, high strength, good elasticity (nylon has good elasticity, and when stretched to 3%-6%, the elastic recovery rate can reach 100%), fatigue resistance (nylon can withstand tens of thousands of flexures without breaking), shock absorption, good dimensional stability, good processing performance, etc.;

[0026] By setting the top surface of the support bar 1 as an arc surface, when the support bar 1 contacts the concrete slab, it can simulate a line support environment, be closer to the test requirements, and improve the accuracy of the test results; at the same time, because the support surface of the support bar 1 is an arc surface and has a certain elasticity, when loading the concrete slab, it can avoid excessive local stress at the line contact position and reduce the phenomenon of concrete cracking at the contact position.

[0027] In a further optimized solution, the connection component includes two support plates 2, the support plates 2 are fixedly connected to the bottom support platform of the testing machine, there is a gap between the support plates 2 and the bottom support platform of the testing machine, and the two support plates 2 are respectively connected to the two support bars 1; by setting the gap, it is convenient for the subsequent operation of tightening the nut 6.

[0028] In a further optimized solution, the support bar 1 and the support plate 2 are detachably connected by a plurality of bolts 3.

[0029] For a further optimized solution, a plurality of first through holes 4 are formed in the support plate 2, and a plurality of second through holes 5 are formed in the support bars 1. The second through holes 5 penetrate through the top and bottom of the support bars 1. The plurality of first through holes 4 and the plurality of second through holes 5 are respectively arranged in one-to-one correspondence with a plurality of bolts 3. The screw rod of the bolt 3 sequentially penetrates through the first through hole 4 and the second through hole 5 and is threadedly connected with a nut 6, and the nut 6 contacts the bottom of the support plate 2.

[0030] For a further optimized solution, a plurality of relief grooves 7 are formed in the top of the support bars 1. The plurality of relief grooves 7 are arranged in one-to-one correspondence with and communicate with the plurality of second through holes 5. The head of the bolt 3 is located in the relief groove 7, and the height of the head of the bolt 3 is lower than the height of the relief groove 7.

[0031] By providing the relief grooves 7, the head of the bolt 3 can be hidden, and the height of the head of the bolt 3 is lower than the height of the relief groove 7. Therefore, during the loading process, contact between the head of the bolt 3 and the concrete slab can be avoided, thereby preventing local cracking of the concrete slab.

[0032] For a further optimized solution, the surface of the support bar 1 connected to the support plate 2 is a flat surface, which increases the contact area between the two and improves stability.

[0033] In this embodiment, a fatigue test is carried out on a 2m by 2m concrete slab. A nylon rod with a diameter of 100mm is used, and 35mm of height is cut off from the edge to the center of the nylon rod to form the support bar 1. Second through holes 5 with a diameter of 14mm are drilled on the support bar 1 every 30cm, and then relief grooves 7 with a diameter of 20mm are drilled at the top of the second through holes 5 for placing the head (hexagonal head) of the bolt 3. The height of the relief groove 7 is 10mm, and first through holes 4 with a diameter of 14mm are reserved on the support plate 2.

[0034] During use, the support bar 1 is placed on the support plate 2, the second through hole 5 is aligned with the first through hole 4, the bolt 3 is placed in the second through hole 5, the head of the bolt 3 enters the relief groove 7, and the bottom extends out of the first through hole 4. Then, a nut 6 is screwed onto the bolt 3 to lock it. The concrete slab is placed on the two support bars 1, and a downward pressure is repeatedly applied to the concrete slab through the top loading head of the testing machine to conduct a fatigue test.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, 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 should not be construed as a limitation to the present utility model.

[0036] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A support device for concrete slab fatigue test, characterized in that: include: A connecting assembly, the connecting assembly is used to connect to the bottom support platform of the testing machine; Two support bars (1), the support bars (1) are connected to the connection assembly, the top surface of the support bars (1) is a curved surface, the top surface of the support bars (1) is used to support the concrete slab, and the support bars (1) are elastic.

2. The support device for concrete slab fatigue test according to claim 1, characterized in that: The connection assembly comprises two support plates (2), the support plates (2) are fixedly connected to the bottom support platform of the testing machine, a gap is provided between the support plates (2) and the bottom support platform of the testing machine, and the two support plates (2) are respectively connected to the two support bars (1).

3. The support device for concrete slab fatigue test according to claim 2, characterized in that: The support bar (1) and the support plate (2) are detachably connected via a plurality of bolts (3).

4. The support device for concrete slab fatigue test according to claim 3, characterized in that: The support plate (2) is provided with a plurality of first through holes (4), the support bar (1) is provided with a plurality of second through holes (5), the second through holes (5) pass through the top and the bottom of the support bar (1), the plurality of first through holes (4) and the plurality of second through holes (5) are respectively arranged in one-to-one correspondence with the plurality of bolts (3), the screw rods of the bolts (3) pass through the first through holes (4) and the second through holes (5) in sequence and are threadedly connected with nuts (6), and the nuts (6) are in contact with the bottom of the support plate (2).

5. The support device for concrete slab fatigue test according to claim 4, characterized in that: A plurality of avoidance grooves (7) are provided on the top of the support bar (1), and the plurality of avoidance grooves (7) are arranged in one-to-one correspondence with and communicate with the plurality of second through holes (5); the head of the bolt (3) is located in the avoidance groove (7), and the height of the head of the bolt (3) is lower than the height of the avoidance groove (7).

6. The support device for concrete slab fatigue test according to claim 2, characterized in that: The surface where the support bar (1) is connected to the support plate (2) is a plane.

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