Concrete pull-out test sample preparation device

Abstract

The utility model provides a concrete pull-out test sample preparation device. The concrete pull-out test sample preparation device comprises a steel mold, an isolation pipe, a first terminal and a second terminal, the steel die is provided with a forming cavity with an opening in the upper end, and a first forming hole and a second forming hole which are coaxial and penetrate through are formed in the two opposite sides of the forming cavity correspondingly so that reinforcing steel bars can penetrate through the first forming hole and the second forming hole. One end of an isolation pipe is inserted into the forming cavity through the first forming hole, the steel bar is sleeved with the isolation pipe, and the isolation pipe can be kept still on the steel bar. The first terminal can block a gap between the outer wall of the isolation pipe and the inner wall of the first forming hole. The second terminal can block a gap between the outer wall of the steel bar and the inner wall of the second forming hole. The forming hole is blocked through the first terminal and the second terminal, and the first terminal and the second terminal are not connected with concrete in the steel mold during disassembly, so that the steel mold is convenient to disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of test equipment, in particular to a concrete pull-out test sample preparation device. Background Art

[0002] In the concrete pull-out test, a concrete pull-out specimen needs to be prepared. The concrete pull-out specimen includes a concrete body and steel bars passing through the concrete body.

[0003] In the prior art, concrete tensile specimens are prepared using a steel mold with an open-top molding cavity. Two coaxial, through-holes are cut transversely through the mold. Rebar is passed through the first molding hole, the molding cavity, and the second molding hole, in sequence. Epoxy resin is then cured to form the gap between the molding holes and the rebar, preventing concrete leakage. Finally, concrete is poured into the molding cavity to form the specimen.

[0004] In practice, the steel mold needs to be disassembled after the preparation of the concrete pull-out specimen is completed. However, the epoxy resin cured at the forming hole is connected to the concrete in the steel mold during the curing and molding process, making it difficult to demold and disassemble the steel mold at this location. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a device for preparing a concrete pull-out test specimen, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems in the prior art.

[0006] The utility model provides a concrete pull-out test specimen preparation device, comprising:

[0007] The steel mold has a forming cavity with an open top end, and a first forming hole and a second forming hole are respectively formed on two opposite sides thereof, which are coaxial and penetrate through the cavity for the steel bars to pass through;

[0008] An isolation tube, one end of which is inserted into the molding cavity through the first molding hole, the isolation tube being sleeved outside the steel bar and being able to remain stationary on the steel bar;

[0009] a first terminal, located outside the steel mold, sleeved on the isolation tube, and threadedly connected to the outer wall of the isolation tube, capable of sealing the gap between the outer wall of the isolation tube and the inner wall of the first forming hole; and

[0010] The second terminal is located outside the steel mold, is sleeved on the steel bar, and is threadedly connected to the steel bar to seal the gap between the outer wall of the steel bar and the inner wall of the second forming hole.

[0011] Preferably, it also includes a flexible first connecting tube; the first connecting tube is sleeved on the steel bar; the first connecting tube is located in the isolation tube; the inner wall and outer wall of the first connecting tube are respectively in contact with the steel bar and the inner wall of the isolation tube.

[0012] Preferably, the first terminal is cylindrical and its outer diameter gradually decreases at one end facing the steel mold, and the outer wall of the end of the first terminal facing the steel mold can abut against the inner wall of the mouth of the first forming hole.

[0013] Preferably, the second terminal is cylindrical and its outer diameter gradually decreases at one end facing the steel mold, and the outer wall of the end of the first terminal facing the steel mold can abut against the inner wall of the mouth of the second forming hole.

[0014] Preferably, it also includes a flexible second connecting tube, which is sleeved outside the isolation tube, one end of the second connecting tube is located in the steel mold, and the other end of the second connecting tube is located in the first terminal and fits against the inner wall of the first terminal.

[0015] Preferably, it further includes a flexible third connecting tube; the third connecting tube is sleeved on the steel bar; one end of the third connecting tube is located in the steel mold, and the other end of the third connecting tube is located in the second terminal and fits with the inner wall of the second terminal.

[0016] Preferably, it further comprises one or more counterweight blocks; the counterweight blocks can be sleeved on the steel bars; and the counterweight blocks are located outside the steel mold.

[0017] Preferably, the steel mold comprises:

[0018] base plate;

[0019] Four side panels, located above the bottom plate, and forming a molding cavity together with the bottom plate; and

[0020] A fixed frame is sleeved outside the four side panels and connected to the four side panels;

[0021] The first forming hole and the second forming hole are respectively opened on two of the opposite side panels.

[0022] Preferably, two fixing frames are provided vertically, and a connecting column is provided on the outer wall of the side panel at each position corresponding to the two fixing frames; the fixing frame is provided with an installation notch for accommodating the connecting column at each position corresponding to the connecting column; each connecting column is connected to a nut, which can be pressed against the fixing frame; the installation notches on the two fixing frames are opposite to each other.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the technology of the utility model, the forming hole is blocked by the first terminal and the second terminal. When disassembling, the first terminal and the second terminal are not connected to the concrete in the steel mold, thereby making it easier to disassemble the steel mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0026] Figure 1 This is a three-dimensional diagram of a concrete pull-out test specimen preparation device in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 A top view of

[0028] Figure 3 for Figure 2 SS surface cross-sectional view;

[0029] Figure 4 for Figure 3 A magnified schematic diagram of point A;

[0030] Figure 5 for Figure 3 Enlarged schematic diagram of point B.

[0031] Reference numerals:

[0032] 10. Steel mold; 11. Molding cavity; 12. First molding hole; 13. Second molding hole; 14. Rebar; 15. Bottom plate; 16. Side panels; 17. Fixing frame; 171. Mounting notch; 18. Connecting column; 19. Nut;

[0033] 20. Isolation tube;

[0034] 30. First terminal;

[0035] 40. Second terminal;

[0036] 50. First connecting pipe;

[0037] 60. Second connecting pipe;

[0038] 70. Third connecting pipe;

[0039] 80. Counterweight. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0043] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0044] In this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0045] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] See also Figures 1 to 5 This embodiment provides a concrete pull-out test specimen preparation device, including a steel mold 10 , an isolation tube 20 , a first terminal 30 and a second terminal 40 .

[0047] The steel mold 10 has an open-top molding cavity 11 with coaxial, through-holes 12 and 13 formed on opposite sides for the passage of steel bars 14. Specifically, the molding cavity 11 is a rectangular parallelepiped, with the axes of the first and second molding holes 12, 13 parallel to the horizontal plane.

[0048] One end of the isolation tube 20 is inserted into the molding cavity 11 through the first molding hole 12. The isolation tube 20 is sleeved over the steel bar 14 and remains stationary on the steel bar 14. Specifically, the isolation tube 20 can be made of PVC. The function of the isolation tube 20 is the same as that of the prior art, forming a non-bonded area.

[0049] The first terminal 30 is located outside the steel mold 10 . The first terminal 30 is sleeved on the isolation tube 20 and is threadedly connected to the outer wall of the isolation tube 20 . The first terminal 30 can seal the gap between the outer wall of the isolation tube 20 and the inner wall of the first forming hole 12 .

[0050] The second terminal 40 is located outside the steel mold 10 . The second terminal 40 is sleeved on the steel bar 14 and threadedly connected to the steel bar 14 . The second terminal 40 can seal the gap between the outer wall of the steel bar 14 and the inner wall of the second forming hole 13 .

[0051] In this embodiment, after the steel mold 10 is placed, the steel bar 14 is placed through the first forming hole 12 and the second forming hole 13, and then the isolation tube 20 is sleeved onto the steel bar 14 from the first forming hole 12. The first terminal 30 is sleeved outside the isolation tube 20 and rotated to abut against the steel mold 10 from the outside. The second terminal 40 is sleeved on the steel bar 14 and rotated to abut against the other side of the steel mold 10. The first terminal 30 and the second terminal 40 can respectively seal the gap between the first forming hole 12 and the second forming hole 13, thereby preventing leakage from the gap between the first forming hole 12 and the second forming hole 13 during subsequent concrete pouring. Compared with the curing and sealing of the forming holes by epoxy resin, the first terminal 30 and the second terminal 40 can be rotated and disassembled, making it more convenient and labor-saving when the steel mold 10 is subsequently disassembled.

[0052] In one embodiment, the concrete pull-out test specimen preparation device also includes a flexible first connecting tube 50, which is sleeved on the steel bar 14. The first connecting tube 50 is located in the isolation tube 20, and the inner wall and outer wall of the first connecting tube 50 are respectively in contact with the inner wall of the steel bar 14 and the isolation tube 20.

[0053] In this embodiment, the flexible first connecting tube 50 can be made of rubber material. The isolation tube 20 can be fixed to the steel bar 14 through the flexibility of the first connecting tube 50. In addition, the first connecting tube 50 can also seal the gap between the isolation tube 20 and the steel bar 14 to prevent concrete from entering the interior of the isolation tube 20 during pouring, destroying the formation of the unbonded area, and preventing concrete from leaking from the gap between the isolation tube 20 and the steel bar 14, resulting in the prepared concrete sample failing to meet the standard.

[0054] In one embodiment, the first terminal 30 is cylindrical, with its outer diameter gradually decreasing (i.e., gradually shrinking) at the end facing the steel mold 10. The outer wall of the end of the first terminal 30 facing the steel mold 10 can abut against the inner wall of the opening of the first molded hole 12. Specifically, the outer contour of the first terminal 30 may not be cylindrical, but may also be conical.

[0055] In this embodiment, the first terminal 30 rotates and moves forward on the isolation tube 20 , and the end thereof close to the steel mold 10 abuts against the mouth of the first forming hole 12 , thereby sealing the first forming hole 12 .

[0056] In one embodiment, the second terminal 40 is cylindrical and its outer diameter gradually decreases at the end facing the steel mold 10. The outer wall of the end of the first terminal 30 facing the steel mold 10 can abut against the inner wall of the mouth of the second forming hole 13. The outer contour of the second terminal 40 can be non-cylindrical and can also be conical.

[0057] In one embodiment, the concrete pull-out test specimen preparation device further includes a flexible second connecting tube 60, which is sleeved on the outside of the isolation tube 20, one end of the second connecting tube 60 is located in the steel mold 10, and the other end of the second connecting tube 60 is located in the first terminal 30 and is in contact with the inner wall of the first terminal 30.

[0058] In this embodiment, the second connecting tube 60 can prevent concrete from entering the gap between the first terminal 30 and the isolation tube 20, thereby preventing the first terminal 30 from being unable to be smoothly rotated and removed due to concrete entering the gap between the isolation tube 20 and the first terminal 30 when the steel mold 10 is subsequently removed, thereby improving the convenience of disassembling the steel mold 10.

[0059] In one embodiment, the concrete pull-out test specimen preparation apparatus further includes a flexible third connecting tube 70. The third connecting tube 70 is sleeved onto the steel bar 14, with one end of the third connecting tube 70 located within the steel mold 10 and the other end of the third connecting tube 70 located within the second terminal 40 and in contact with the inner wall of the second terminal 40.

[0060] In this embodiment, the effect of the third connecting pipe 70 is the same as that of the second connecting pipe 60 .

[0061] In one embodiment, the concrete pullout test specimen preparation apparatus further includes one or more counterweights 80, which can be mounted on the rebar 14; the counterweights 80 are located outside the steel mold 10. Specifically, the counterweights 80 can be connected to the first terminal 30 or the second terminal 40. The counterweights 80 located outside the steel mold 10 exert a downward force on the rebar 14 outside the steel mold 10 through gravity, thereby partially offsetting the weight of the concrete after pouring. This ensures that the rebar 14 inside the steel mold 10 is relatively straight, thereby improving the quality of the prepared specimen.

[0062] In one embodiment, the steel mold 10 includes a bottom plate 15 , four side panels 16 and a fixing frame 17 .

[0063] Four side panels 16 are positioned above the base plate 15, and together they form a molding cavity 11. A fixing frame 17 is sleeved over the four side panels 16 and connected to them. The first molding hole 12 and the second molding hole 13 are respectively defined in two opposing side panels 16. The fixing frame 17 can be a rectangular frame.

[0064] In this embodiment, the four side panels 16 and the fixing frame 17 are connected and placed on the bottom plate 15, and concrete is poured into the forming cavity 11 from above. When disassembling, the first terminals 30 and the second terminals 40 on both sides are loosened to disconnect the connection between the fixing frame 17 and the side panels 16. After removing the fixing frame 17, the side panels 16 can be removed, which makes disassembly more convenient.

[0065] In one embodiment, two fixing frames 17 are provided vertically, with a connecting post 18 provided on the outer wall of the side panel 16, corresponding to each of the two fixing frames 17. A mounting notch 171 is provided on each of the fixing frames 17, corresponding to each of the connecting posts 18, for accommodating the connecting post 18. A nut 19 is attached to each connecting post 18, which can abut against the fixing frame 17. The mounting notches 171 on the two fixing frames 17 face each other. Specifically, the mounting notch 171 on the upper fixing frame 17 faces downward, while the mounting notch 171 on the lower fixing frame 17 faces upward.

[0066] In this embodiment, two fixing frames 17 are respectively inserted from the top and bottom of the four side panels 16. Nuts 19 are used to clamp the fixing frames 17 to the side panels 16, thereby securing the fixing frames 17 to the side panels 16. The provision of two fixing frames 17 enhances the stability of the overall structure and prevents deformation. During disassembly, after loosening the nuts 19, the two fixing frames 17 can be removed from the top and bottom, respectively, which is relatively convenient.

[0067] In the specification of the present invention, a large number of specific details are described. However, it is understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A concrete pull-out test specimen preparation device, characterized in that: include: The steel mold (10) has a molding cavity (11) with an open top end, and a first molding hole (12) and a second molding hole (13) are respectively provided on two opposite sides thereof, which are coaxial and penetrate through the molding cavity for allowing the steel bar (14) to pass through; An isolation tube (20), one end of which is inserted into the molding cavity (11) through the first molding hole (12), the isolation tube (20) being sleeved outside the steel bar (14), and the isolation tube (20) being able to remain stationary on the steel bar (14); A first terminal (30) is located outside the steel mold (10), is sleeved on the isolation tube (20), and is threadedly connected to the outer wall of the isolation tube (20), so as to seal the gap between the outer wall of the isolation tube (20) and the inner wall of the first forming hole (12); and The second terminal (40) is located outside the steel mold (10), is sleeved on the steel bar (14), and is threadedly connected to the steel bar (14), and can seal the gap between the outer wall of the steel bar (14) and the inner wall of the second forming hole (13).

2. A concrete pull-out test specimen preparation device according to claim 1, characterized in that: It also includes a flexible first connecting tube (50); the first connecting tube (50) is sleeved on the steel bar (14); the first connecting tube (50) is located in the isolation tube (20); the inner wall and outer wall of the first connecting tube (50) are respectively in contact with the steel bar (14) and the inner wall of the isolation tube (20).

3. A concrete pull-out test specimen preparation device according to claim 2, characterized in that: The first terminal (30) is cylindrical and has an outer diameter gradually decreasing at one end facing the steel mold (10). The outer wall of the end of the first terminal (30) facing the steel mold (10) can abut against the inner wall of the mouth of the first forming hole (12).

4. A concrete pull-out test specimen preparation device according to claim 3, characterized in that: The second terminal (40) is cylindrical and has an outer diameter gradually decreasing at one end facing the steel mold (10). The outer wall of one end of the first terminal (30) facing the steel mold (10) can abut against the inner wall of the mouth of the second forming hole (13).

5. A concrete pull-out test specimen preparation device according to any one of claims 2 to 4, characterized in that: It also includes a flexible second connecting tube (60), which is sleeved outside the isolation tube (20), one end of the second connecting tube (60) is located in the steel mold (10), and the other end of the second connecting tube (60) is located in the first terminal (30) and is in contact with the inner wall of the first terminal (30).

6. A concrete pull-out test specimen preparation device according to claim 5, characterized in that: It also includes a flexible third connecting tube (70); the third connecting tube (70) is sleeved on the steel bar (14); one end of the third connecting tube (70) is located in the steel mold (10), and the other end of the third connecting tube (70) is located in the second terminal (40) and is in contact with the inner wall of the second terminal (40).

7. A concrete pull-out test specimen preparation device according to claim 6, characterized in that: It also includes one or more counterweight blocks (80); the counterweight blocks (80) can be sleeved on the steel bars (14); and the counterweight blocks (80) are located outside the steel mold (10).

8. A concrete pull-out test specimen preparation device according to claim 7, characterized in that: The steel mold (10) comprises: bottom plate (15); Four side panels (16) are located above the bottom plate (15) and together with the bottom plate (15) form a molding cavity (11); and A fixed frame (17) is sleeved outside the four side panels (16) and is connected to the four side panels (16); The first molded hole (12) and the second molded hole (13) are respectively opened on two of the opposite side panels (16).

9. A concrete pull-out test specimen preparation device according to claim 8, characterized in that: Two fixing frames (17) are vertically provided, and a connecting column (18) is provided on the outer wall of the side panel (16) corresponding to the two fixing frames (17); a mounting notch (171) for accommodating the connecting column (18) is provided on the fixing frame (17) corresponding to each connecting column (18); a nut (19) is connected to each connecting column (18), and the nut (19) can be abutted against the fixing frame (17); the mounting notches (171) on the two fixing frames (17) are opposite to each other.

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