A concrete test mould

Abstract

A kind of concrete test mould, including mould body, mould body has rectangular cavity, movable component is provided in mould body, movable component includes rectangular frame part arranged in the interior of mould body, the upper end of rectangular frame part is equipped with lower hopper, lower hopper is in the form of frustum of cone structure, and the size of the upper end of lower hopper is greater than the size of its lower end.The utility model has the advantages of stable connection, accurate guidance, by the setting of guide rail and guide slot, it is guaranteed that rectangular frame part always moves on predetermined vertical trajectory, avoids inclination and shaking, and operation is more smooth.The utility model has the advantages of reliable function, improving quality, stable connection makes the action of "wiping" exhaust more effective and consistent, can better exclude corner air bubble, overall improve the uniformity and compactness of test block, to ensure the accuracy of detection data.

Description

Technical Field

[0001] This utility model relates to the field of concrete performance testing technology in building engineering, and in particular to a concrete test mold. Background Technology

[0002] In the quality inspection of building construction projects, it is necessary to prepare standard-sized concrete test blocks (such as 150mm×150mm×150mm cube test blocks) for performance tests such as compressive strength. The test block preparation process usually involves filling freshly mixed concrete into a mold and then vibrating it on a vibrating table to remove internal air bubbles and make it dense.

[0003] However, existing test molds have the following two main technical problems during the vibration process: 1. Grout overflow and insufficient specimen height: Under the action of vibration, the aggregate in the concrete sinks and the grout floats, causing the liquid level to rise. Since the top of the mold is open, some grout overflows from the upper edge of the mold, resulting in the actual height of the final formed specimen being less than the standard requirement of 150mm. This dimensional deviation directly affects the accuracy of the compressive strength test results, distorting the test data.

[0004] 2. Air bubbles at the edges and corners and uneven density: Traditional vibration methods cannot completely eliminate air bubbles in the four corner areas of the inner wall of the mold, resulting in poor density at the edges and corners of the test block, forming structural weaknesses, which may cause failure to begin from these areas during pressure testing.

[0005] To address this issue, some technicians have proposed inserting specially shaped movable plates into the four inner walls of the mold. These movable plates are funnel-shaped. Their working principle is as follows: Overflow prevention: During vibration, the horizontal part of the movable plate covers the concrete liquid surface, like a small "lid", preventing the slurry from overflowing from the interface between the inner wall of the mold and the liquid surface.

[0006] Densification: After vibration, the movable plate is pulled up and down to "wipe" the concrete near the side wall of the test mold using its vertical plate surface, so as to further break down and remove air bubbles attached to the side wall and strengthen the density of the corner area.

[0007] However, this existing solution has significant shortcomings: Unstable connection: There is usually no reliable connection and guiding structure between the movable plate and the inner wall of the mold. During vibration and pulling, the movable plate is prone to tilting, shaking or even falling off, affecting the use effect and operation efficiency.

[0008] Poor sealing effect: There is a gap between the movable plate and the inner wall of the mold, and small amounts of cement slurry may still seep out, resulting in incomplete overflow prevention.

[0009] Inconvenient to operate: Due to the lack of guidance, it is not smooth to pull up and down, which is laborious and can easily disturb the already formed concrete surface. Utility Model Content

[0010] This utility model provides a concrete test mold to overcome the shortcomings of the prior art. The test mold is designed to achieve connection stability, precise guidance and effective sealing, and ensure smooth operation during vibration and pumping, thereby reliably preventing grout overflow and improving the density of the test block.

[0011] In order to achieve the purpose of this utility model, the following technology is proposed to be adopted: A concrete test mold includes a mold body with a rectangular cavity and movable parts inside the mold body; The movable part includes a rectangular frame inside the mold body. The upper end of the rectangular frame is provided with a hopper. The hopper has a frustum-shaped structure, and the size of the upper end of the hopper is larger than the size of its lower end.

[0012] Furthermore, the mold body includes a rectangular base plate, and a rectangular outer frame plate is fixed to the outer periphery of the base plate by screws.

[0013] Furthermore, a pair of guide rails are provided on each of the four outer walls of the rectangular frame, and a pair of guide grooves are provided on each of the four inner walls of the outer frame plate, with the guide rails movably disposed within the guide grooves.

[0014] Furthermore, the guide rail and guide groove have a T-shaped structure.

[0015] Furthermore, an upper convex plate is formed extending upward from the upper end of the guide rail. An outer extension plate is welded to the upper outer wall of the upper convex plate on the same side. A fixing strip is welded to the upper end of the outer wall of the rectangular frame. A wing plate is vertically bent on the fixing strip. A pair of strip holes are opened on the wing plate. A movable screw is movably installed in the strip hole. An outer retaining strip is threaded to the lower end of the movable screw. A lower retaining plate is formed on the inner wall of the outer retaining strip. The outer extension plate is inserted between the lower retaining plate and the wing plate.

[0016] Furthermore, grip openings are provided on the wing panels.

[0017] Furthermore, a movable strip is movably provided on the shank of the movable screw and below its end cap. A transverse hole parallel to its length is provided on the movable strip. The shank of the movable screw passes through the transverse hole. An L-shaped groove is provided on the movable strip. The inner end of the groove is open. One end of the groove is parallel to the width direction of the movable strip, and the other end of the groove is parallel to the length direction of the movable strip. A connecting screw is provided in the groove. The lower end of the connecting screw is threaded to the wing plate.

[0018] The advantages of the above technical solution are: This invention has the advantages of stable connection and precise guidance. By setting guide rails and guide grooves, it ensures that the rectangular frame always moves on the predetermined vertical trajectory, avoiding tilting and shaking, and making the operation smoother.

[0019] This invention has the advantages of reliable function and improved quality. The stable connection makes the "wiping" and degassing action more effective and consistent, which can better eliminate air bubbles at the edges and corners, and improve the uniformity and density of the test block as a whole, thereby ensuring the accuracy of the test data.

[0020] This invention allows the guide rail and rectangular frame to separate after wiping, preventing concrete from entering the guide groove and affecting subsequent use and cleaning difficulty. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will provide a more detailed description of this utility model in conjunction with the accompanying drawings.

[0022] Figure 1 A three-dimensional structural diagram of the concrete test mold is shown.

[0023] Figure 2 A three-dimensional structural diagram of the model is shown.

[0024] Figure 3 A three-dimensional structural diagram of the moving parts is shown.

[0025] Figure 4 A magnified view of point A is shown. Detailed Implementation

[0026] like Figures 1-4 As shown, a concrete test mold includes a mold body 1, which has a rectangular cavity and a movable part 2 inside the mold body 1.

[0027] The mold body 1 includes a rectangular base plate 10, and a rectangular outer frame plate 11 is fixed to the outer periphery of the base plate 10 by screws 12.

[0028] The movable component 2 includes a rectangular frame 20 located inside the mold body 1, specifically inside the outer frame plate 11. The upper end of the rectangular frame 20 has a hopper 21, which is frustoconical in shape, with the upper dimension of the hopper 21 larger than its lower dimension. A pair of guide rails 22 are provided on each of the four outer walls of the rectangular frame 20, and a pair of guide grooves 13 are provided on each of the four inner walls of the outer frame plate 11. The guide rails 22 are movably disposed within the guide grooves 13, and the guide rails 22 and guide grooves 13 form a T-shape.

[0029] The upper end of the guide rail 22 extends upward to form an upper convex plate 220. An outer extension plate 23 is welded to the upper outer wall of the upper convex plate 220 on the same side. A fixing strip 24 is welded to the upper end of the outer wall of the rectangular frame 20. A wing plate 25 is bent vertically on the fixing strip 24. A gripping opening 26 is provided on the wing plate 25. A pair of strip holes 27 are provided on the wing plate 25. A movable screw 28 is movably installed in the strip hole 27. An outer retaining strip 34 is threaded to the lower end of the movable screw 28. A lower retaining plate 35 is formed on the inner wall of the outer retaining strip 34. The outer extension plate 23 is inserted between the lower retaining plate 35 and the wing plate 25.

[0030] A movable strip 30 is movably provided on the rod of the movable screw 28 and below its end cap. A transverse hole 31 parallel to its length direction is provided on the movable strip 30. The rod of the movable screw 28 passes through the transverse hole 31. An L-shaped groove 32 is provided on the movable strip 30. The inner end of the groove 32 is open. One end of the groove 32 is parallel to the width direction of the movable strip 30, and the other end of the groove 32 is parallel to the length direction of the movable strip 30. A connecting screw 33 is provided in the groove 32. The lower end of the connecting screw 33 is threaded to the wing plate 25.

[0031] The working process of this embodiment is as follows: The guide rail 22 is connected to the rectangular frame 20. During connection, the operator presses each pair of guide rails 22 against the outer wall of the rectangular frame 20, and then pushes the movable strip 30 inward so that the outer extension plate 23 is inserted between the lower clamping plate 35 and the wing plate 25. During movement, the connecting screw 33 passes through the slot 32 and then moves along the length of the movable strip 30 so that the connecting screw 33 is engaged at the end of the slot 32. To prevent the guide rail 22 from moving along the length of the outer extension plate 23, multiple grooves can be provided on the outer extension plate 23, and multiple protrusions can be provided on the inner wall of the outer clamping strip 34. After connection, the protrusions are engaged in the grooves.

[0032] The guide rail 22 is inserted into the guide groove 13, and the lower end of the rectangular frame 20 abuts against the base plate 10.

[0033] Then concrete is poured into the rectangular frame 20.

[0034] The concrete-filled mold is placed on the vibrating table for compaction. At this time, the hopper 21 can effectively prevent the concrete from overflowing, and because it passes through the guide rail 22 and the guide groove 13, it can prevent the rectangular frame 20 from moving within the rectangular cavity.

[0035] After vibration, the operator slowly pulls the rectangular frame 20 up and down several times through the grip 26. By moving the rectangular frame 20, the outer perimeter of the concrete can be wiped, and during the wiping process, air bubbles at the edges and corners are broken and removed.

[0036] Cancel the connection between the guide rail 22 and the rectangular frame 20, then remove the rectangular frame 20 from the rectangular cavity, smooth the top of the concrete, and demold after the specified time to obtain a concrete test block with standard size and high density.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A concrete test mold, characterized in that, Includes a mold body (1), which has a rectangular cavity and a movable part (2) inside the mold body (1); The movable part (2) includes a rectangular frame (20) located inside the mold body (1). The upper end of the rectangular frame (20) is provided with a feeding hopper (21). The feeding hopper (21) has a frustum-shaped structure, and the size of the upper end of the feeding hopper (21) is larger than the size of its lower end.

2. The concrete test mold according to claim 1, characterized in that, The mold (1) includes a rectangular base plate (10), and a rectangular outer frame plate (11) is fixed to the outer periphery of the base plate (10) by screws (12).

3. The concrete test mold according to claim 2, characterized in that, A pair of guide rails (22) are provided on the four outer walls of the rectangular frame (20), and a pair of guide grooves (13) are provided on the four inner walls of the outer frame plate (11). The guide rails (22) are movably located in the guide grooves (13).

4. The concrete test mold according to claim 3, characterized in that, The guide rail (22) and the guide groove (13) have a T-shaped structure.

5. The concrete test mold according to claim 3, characterized in that, The upper end of the guide rail (22) extends upward to form an upper convex plate (220). The upper outer wall of the upper convex plate (220) on the same side is welded with an extension plate (23). The upper end of the outer wall of the rectangular frame (20) is welded with a fixing strip (24). A wing plate (25) is bent vertically on the fixing strip (24). A pair of strip holes (27) are opened on the wing plate (25). A movable screw (28) is movably installed in the strip hole (27). The lower end of the movable screw (28) is connected to an outer clamping strip (34) by a thread. A lower clamping plate (35) is formed on the inner wall of the outer clamping strip (34). The extension plate (23) is inserted between the lower clamping plate (35) and the wing plate (25).

6. The concrete test mold according to claim 5, characterized in that, A grip opening (26) is provided on the wing plate (25).

7. The concrete test mold according to claim 5, characterized in that, A movable strip (30) is provided on the rod of the movable screw (28) and below its end cap. A transverse hole (31) parallel to its length direction is provided on the movable strip (30). The rod of the movable screw (28) passes through the transverse hole (31). A slot (32) with an L-shaped structure is provided on the movable strip (30). The inner end of the slot (32) is open. One part of the slot (32) is parallel to the width direction of the movable strip (30), and the other part of the slot (32) is parallel to the length direction of the movable strip (30). A connecting screw (33) is provided in the slot (32). The lower end of the connecting screw (33) is connected to the wing plate (25) by a thread.

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