Iron tailing aggregate concrete shrinkage test device

Abstract

The utility model belongs to the field of concrete shrinkage test detection, and particularly relates to an iron tailing aggregate concrete shrinkage test device which comprises a bottom plate, a forming cylinder vertically arranged on the upper surface of the bottom plate and a supporting assembly used for fixing a dial indicator. The supporting assembly comprises two first supporting blocks and two second supporting blocks, the two first supporting blocks and the two second supporting blocks are vertically arranged on the surface of the bottom plate, the positioning blocks are vertically fixed to the upper end face of each first supporting block, and the two second supporting blocks are vertically fixed to the lower end face of each second supporting block. The two first supporting blocks are detachably connected with the fixing block through the positioning blocks, a plurality of positioning holes matched with the dial indicator are formed in the surface of each first supporting block and the surface of each second supporting block, and by the adoption of the technical scheme, the problem that a traditional concrete testing device can only test one-way shrinkage can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of concrete shrinkage testing, specifically relating to a shrinkage testing device for iron tailings aggregate concrete. Background Technology

[0002] The expansion and contraction of concrete are volumetric deformations caused by a combination of hydration reactions, environmental factors, and material properties. This deformation can lead to cracks in concrete structures during use, reducing structural stiffness and affecting durability. Therefore, shrinkage testing of concrete is necessary before pouring. Traditional concrete shrinkage testing methods are divided into contact and non-contact methods. Non-contact methods offer higher measurement accuracy but have higher equipment costs and require more stringent environmental and technical conditions. Contact methods, on the other hand, are widely used due to their lower equipment costs and ease of operation. For example, a Chinese patent discloses a cement concrete shrinkage testing instrument (patent publication number: CN217879196U). This instrument uses a locking assembly to fix the first and second shells together to form a complete cylinder, with the base plate clamped between them. This facilitates the pouring of mixed cement concrete, preventing leakage from the gaps between the shells. A dial indicator is then installed on the test frame to perform shrinkage tests on the formed concrete.

[0003] Although the above technical solution provides a shrinkage tester, the dial gauge is installed on the test frame and can only test the unidirectional shrinkage of concrete. The data collected is limited and affects the test results. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a concrete shrinkage testing device to solve the problem that traditional concrete testing devices can only test unidirectional shrinkage.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A shrinkage test device for iron tailings aggregate concrete includes a base plate, a molding cylinder vertically arranged on its upper surface, and a support assembly for fixing a dial indicator. The upper end face of the molding cylinder has two symmetrical positioning blocks about its axis, and the two positioning blocks are detachably connected to a horizontally arranged fixing block. The surface of the fixing block is detachably connected to a positioning rod coaxial with the molding cylinder. The support assembly includes two first support blocks and two second support blocks vertically arranged on the surface of the base plate. The two first support blocks and two second support blocks are arranged in a ring at uniform intervals in a horizontal plane. The upper end face of each first support block is vertically fixed with the positioning block, and the two first support blocks are detachably connected to the fixing block through the positioning block. Each first support block and second support block has multiple positioning holes on its surface that mate with the dial indicator, and these positioning holes are vertically spaced.

[0007] Furthermore, the bottom ends of the two second support blocks are connected to a movable ring, which is horizontally rotatably mounted on the upper surface of the base plate, and the diameter of the movable ring is greater than the distance between the two first support blocks.

[0008] Furthermore, the support assembly also includes multiple arc-shaped blocks horizontally arranged between the two second support blocks. Each arc-shaped block is paired in pairs on the horizontal plane to form two vertically spaced annular structures. The diameter of the annular structure is larger than the distance between the two first support blocks. A vertically placed movable block is connected between the two annular structures. The movable block is slidably disposed on the outer surface of the corresponding two arc-shaped blocks along the axis of the annular structure. A vertically moving positioning cylinder is slidably connected to the outer surface of the movable block. The axis of the positioning cylinder is horizontally arranged and cooperates with a dial indicator. The surface of the movable block is also provided with a drive assembly for driving the positioning cylinder to move vertically.

[0009] Furthermore, the drive assembly includes a threaded rod that is vertically positioned and rotatably disposed on the outer surface of the movable block, and a movable cylinder that is sleeved on the threaded rod and threadedly connected thereto, wherein the movable cylinder is fixedly connected to the positioning cylinder.

[0010] Furthermore, the fixing block is composed of a first fixing block and a second fixing block that are arranged vertically and rotatably connected to each other, and the surface of the first fixing block is provided with a plurality of positioning holes arranged along its length direction.

[0011] Furthermore, each of the positioning holes has a rubber abutment block on its inner wall.

[0012] Furthermore, a connecting cylinder is rotatably connected to the upper surface of the base plate, and the outer ring of the forming cylinder is threadedly connected to the inner ring surface of the connecting cylinder.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention utilizes a first and second support block arranged in a ring and multiple positioning holes to achieve simultaneous multi-point circumferential detection of concrete blocks, avoiding single-point measurement errors and improving the accuracy of shrinkage data. Simultaneously, the movable ring drives the second support block to rotate, expanding the horizontal detection range of the dial indicator. Furthermore, the stepless vertical adjustment of the positioning cylinder via the threaded rod covers the detection blind spots between adjacent positioning holes, achieving full-height measurement without blind spots. In addition, the structural design of the first and second fixing blocks allows for simultaneous shrinkage testing of the upper surface of the concrete block, further expanding the detection range.

[0015] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0017] Figure 1 This is a schematic diagram of the molding cylinder and support assembly structure of this utility model. Figure 1 ;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the concrete block and the supporting components of this utility model.

[0020] The following labels are shown in the attached diagram:

[0021] 1. Base plate, 2. Molding cylinder, 3. Support assembly, 301. First support block, 302. Second support block, 303. Movable ring, 304. Positioning hole, 305. Arc block, 306. Movable block, 307. Positioning cylinder, 4. Positioning block, 5. Positioning rod, 6. Threaded rod, 7. Movable cylinder, 8. Abutment block, 9. Connecting cylinder, 10. Dial gauge, 11. Concrete block, 12. Fixing block. Detailed Implementation

[0022] like Figures 1 to 3 As shown,

[0023] A shrinkage test device for iron tailings aggregate concrete includes a base plate 1, a molding cylinder 2 vertically mounted on its upper surface, and a support assembly 3 for fixing a dial gauge 10. The molding cylinder 2 has an inner diameter of 100mm, a wall thickness of 10mm, and a height of 150mm. Two positioning blocks 4 symmetrical about their axes are vertically welded to the upper end face of the molding cylinder 2, and the two positioning blocks 4 are detachably connected to a horizontally mounted fixing block 12. The fixing block 12 is a cuboid rod with a length of 120mm, a width of 10mm, and a height of 10mm. The surface of the fixing block 12 has through holes that mate with the two positioning blocks 4. A positioning rod 5 coaxial with the molding cylinder 2 is detachably connected to the surface of the fixing block 12. The positioning rod 5 is a rod with a length of 120mm and a diameter of 10mm. The positioning rod 5 is vertically inserted at the center of the fixing block 12, and a coaxially mounted circular stop is integrally formed on the outer surface of the positioning rod 5. The support assembly 3... Component 3 includes two first support blocks 301 and two second support blocks 302 vertically fixed to the surface of the base plate 1. The two first support blocks 301 and the two second support blocks 302 are arranged in a ring with uniform spacing. The horizontal cross-section of each first support block 301 and each second support block 302 is rectangular. Each first support block 301 and each second support block 302 is 50mm long, 50mm wide, and 150mm high. The upper end face of each first support block 301 is vertically fixed with the positioning block 4. The two first support blocks 301 are detachably connected to the fixing block 12 through the positioning block 4. Each surface of each first support block 301 and second support block 302 has two positioning holes 304 that cooperate with the dial indicator 10. The diameter of the positioning holes 304 is 5mm, and the positioning holes 304 on the surface of the first support block 301 and the second support block 302 are vertically spaced.

[0024] As shown in the figure, during the concrete shrinkage test, a release agent is first sprayed onto the inner surface of the molding cylinder 2. Then, concrete containing iron tailings aggregate is poured into the molding cylinder 2. The through holes on the fixing block 12 are passed through the corresponding positioning blocks 4 and fixed to the upper end face of the molding cylinder 2. Subsequently, one end of the positioning rod 5 is passed through the fixing block 12 and coaxially inserted into the molding cylinder 2 until the stop on the positioning rod 5 abuts against the surface of the fixing block 12. After the concrete has solidified for a period of time, the positioning rod 5 and the concrete become a whole. The molded concrete block 11, together with the fixing block 12 and the positioning rod 5, is placed on the support assembly 3. The through holes on the surface of the positioning rod 5 are respectively matched with the positioning blocks 4 on the two first support blocks 301, and the concrete block 11 is fixed to the two first support blocks 301. Between blocks 301, the measuring end of a dial indicator 10 is passed through any of the positioning holes 304 on the first support block 301 or the second support block 302 and brought into contact with the outer surface of the concrete block 11 to measure the outer surface of the concrete block 11. Then, the number pointed to by the pointer on the dial indicator 10 is recorded at regular intervals to record the shrinkage of the concrete block 11. Since the two first support blocks 301 and the two second support blocks 302 are evenly spaced in a ring and their surfaces are all provided with vertically spaced positioning holes 304, dial indicators 10 can be placed in multiple positioning holes 304 at the same time to perform multi-point circumferential testing on the concrete block 11. This allows for the measurement of the shrinkage value of the concrete block 11 in different directions, making the test results more accurate.

[0025] In this embodiment, the bottom ends of the two second support blocks 302 are connected to a movable ring 303. The movable ring 303 is horizontally rotatably disposed on the upper surface of the base plate 1, and the diameter of the movable ring 303 is greater than the distance between the two first support blocks 301.

[0026] As shown in the figure, by rotating the movable ring 303, the two second support blocks 302 can be rotated on the horizontal plane, indirectly adjusting the position of the positioning holes 304 on the surface of each second support block 302, so that the dial indicator 10 that cooperates with it can perform a wider range of inspection on the concrete block 11 on the horizontal plane.

[0027] In this embodiment, the support assembly 3 further includes four arc-shaped blocks 305 horizontally disposed between two second support blocks 302. Each arc-shaped block 305 is paired in pairs on the horizontal plane to form two vertically spaced annular structures. The vertical spacing between the two annular structures is such that the two ends of each arc-shaped block 305 are welded and fixed to the surface of the corresponding second support block 302. The diameter of the annular structure is larger than the distance between the two first support blocks 301. A vertically positioned movable block 306 connects the two annular structures. The movable block 306 is slidably disposed on the outer surface of the two corresponding arc-shaped blocks 305 along the axis of the annular structure. The outer surface of the movable block 306 is slidably connected to a vertically moving positioning cylinder 307. The axis of the positioning cylinder 307 is horizontally arranged and cooperates with the dial indicator 10. The surface of the movable block 306 is also provided with a driving component for driving the positioning cylinder 307 to move vertically. The outer surface of the movable block 306 is provided with an elongated through hole that cooperates with the positioning cylinder 307. The length of the elongated through hole is equal to the vertical distance between the two annular structures.

[0028] As shown in the figure, the movable block 306, the positioning cylinder 307, and the driving assembly are provided in two parts and are symmetrically arranged about the axis of the movable ring 303. The driving assembly can adjust the vertical position of the positioning cylinder 307, thereby indirectly adjusting the vertical detection position of the dial indicator 10 after cooperating with the positioning cylinder 307. Compared with the fixed positioning holes 304 opened on the surface of the first support block 301 and the second support block 302, the driving assembly can steplessly adjust the vertical position of the positioning cylinder 307, solving the detection dead angle between any two adjacent positioning holes 304 in the same vertical direction. Furthermore, the movable block 306 is circumferentially slidable on the outer surface of the arc block 305, which can more flexibly adjust the position of the positioning cylinder 307 and effectively reduce the dead angle when performing shrinkage detection on the concrete block 11.

[0029] In this embodiment, the driving assembly includes a threaded rod 6 that is vertically and rotatably disposed on the outer surface of the movable block 306, a slider that is vertically slidably disposed on the movable block 306, and a movable cylinder 7 that is sleeved on the threaded rod 6 and threadedly connected thereto. The outer surface of the movable block 306 is provided with a vertical groove that cooperates with the slider. The slider, the movable cylinder 7 and the positioning cylinder 307 are fixedly connected and form an integral unit. A handle is coaxially fixed to the upper end of the threaded rod 6.

[0030] Combination Figure 2 As shown, rotating the threaded rod 6 can drive the slider, movable cylinder 7 and positioning cylinder 307 to move vertically, and the cooperation between the movable cylinder 7 and the threaded rod 6 can achieve continuous and stepless adjustment. The structure is simple and reliable, and the operation is convenient and quick.

[0031] In this embodiment, the fixing block 12 is composed of a first fixing block and a second fixing block that are arranged vertically and rotatably connected to each other, and the rotation is provided with damping. The surfaces of the first fixing block and the second fixing block are provided with through holes that cooperate with the positioning block 4. The surface of the first fixing block is provided with a plurality of positioning holes 304 arranged along its length direction.

[0032] As shown in the figure, when making the concrete block 11, the through holes on the surfaces of the first fixing block and the second fixing block are matched with the corresponding positioning blocks 4. When the concrete block 11 moves to the support assembly 3, the through holes on the surface of the second fixing block are matched with the positioning blocks 4 on the upper ends of the two first support blocks 301. By rotating the first fixing block and making the positioning holes 304 on its surface correspond to the upper end face of the concrete block 11, the dial indicator 10 that matches it can perform shrinkage detection on the upper end face of the concrete block 11, further improving the detection range of the concrete block 11.

[0033] In this embodiment, each of the positioning holes 304 and positioning cylinders 307 has a rubber abutment block 8 on its inner wall. When the working end of the dial indicator 10 passes through the positioning hole 304 or positioning cylinder 307, the surface of the dial indicator 10 improves the stability of the connection by squeezing the abutment block 8 and causing it to undergo elastic deformation.

[0034] In this embodiment, a connecting cylinder 9 is rotatably connected to the upper surface of the base plate 1. The outer ring of the forming cylinder 2 is threadedly connected to the inner ring surface of the connecting cylinder 9, which facilitates the disassembly of the connecting cylinder 9 and the cleaning of its inner wall, reduces concrete residue, and facilitates the subsequent demolding of the concrete block 11.

[0035] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A shrinkage test device for iron tailings aggregate concrete, comprising a base plate (1), a molding cylinder (2) vertically arranged on its upper surface, and a support assembly (3) for fixing a dial indicator (10), characterized in that: The upper end face of the forming cylinder (2) is vertically provided with two positioning blocks (4) symmetrical about its axis, and the two positioning blocks (4) are detachably connected to a horizontally arranged fixing block (12). The surface of the fixing block (12) is detachably connected to a positioning rod (5) coaxial with the forming cylinder (2); the support assembly (3) includes two first support blocks (301) and two second support blocks (302) vertically arranged on the surface of the base plate (1). The two first support blocks (301) and the two second support blocks (302) are horizontally arranged. The surfaces are arranged in a ring with uniform intervals. The upper surface of each first support block (301) is vertically fixed with the positioning block (4). The two first support blocks (301) are detachably connected to the fixing block (12) through the positioning block (4). The surfaces of each first support block (301) and second support block (302) are provided with multiple positioning holes (304) that cooperate with the dial indicator (10). The positioning holes (304) on the surfaces of the first support block (301) and second support block (302) are arranged vertically at intervals.

2. The iron tailings aggregate concrete shrinkage test device according to claim 1, characterized in that: The bottom ends of the two second support blocks (302) are connected to a movable ring (303), which is horizontally rotatably mounted on the upper surface of the base plate (1), and the diameter of the movable ring (303) is greater than the distance between the two first support blocks (301).

3. The iron tailings aggregate concrete shrinkage test device according to claim 2, characterized in that: The support assembly (3) further includes a plurality of arc-shaped blocks (305) horizontally arranged between two second support blocks (302). Each arc-shaped block (305) is paired in pairs on the horizontal plane and together forms two vertically spaced annular structures. The diameter of the annular structure is greater than the distance between the two first support blocks (301). A vertically arranged movable block (306) is connected between the two annular structures. The movable block (306) is slidably arranged on the outer surface of the corresponding two arc-shaped blocks (305) along the axis of the annular structure. A vertically moving positioning cylinder (307) is slidably connected to the outer surface of the movable block (306). The axis of the positioning cylinder (307) is horizontally arranged and cooperates with the dial indicator (10). The surface of the movable block (306) is also provided with a drive assembly for driving the positioning cylinder (307) to move vertically.

4. The iron tailings aggregate concrete shrinkage test device according to claim 3, characterized in that: The drive assembly includes a threaded rod (6) that is vertically mounted and rotatably disposed on the outer surface of the movable block (306), and a movable cylinder (7) that is sleeved on the threaded rod (6) and threadedly connected thereto, wherein the movable cylinder (7) is fixedly connected to the positioning cylinder (307).

5. The iron tailings aggregate concrete shrinkage test device according to claim 1, characterized in that: The fixing block (12) is composed of a first fixing block and a second fixing block that are arranged vertically and rotatably connected to each other. The surface of the first fixing block is provided with a plurality of positioning holes (304) arranged along its length direction.

6. The iron tailings aggregate concrete shrinkage test device according to claim 5, characterized in that: Each of the positioning holes (304) has a rubber abutment block (8) on its inner wall.

7. The iron tailings aggregate concrete shrinkage test device according to claim 1, characterized in that: The upper surface of the base plate (1) is rotatably connected to a connecting cylinder (9), and the outer ring of the forming cylinder (2) is threadedly connected to the inner ring surface of the connecting cylinder (9).

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