A concrete crack depth measuring scale
By designing a connecting component between the main scale and the auxiliary scale, the measuring range of the concrete crack measuring ruler was extended, solving the problems of portability and accuracy, and realizing portable and accurate crack depth measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIFANG ZHENGXIN ENG QUALITY INSPECTION CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-06-26
AI Technical Summary
Existing concrete crack measuring rulers have limited measuring range, resulting in poor portability. Furthermore, traditional methods such as chiseling and ultrasonic methods have drawbacks such as being highly destructive or having large errors.
A concrete crack depth measuring ruler consisting of a main scale and a vernier scale was designed. The vernier scale and the main scale can be quickly locked and separated through a connecting component. The measuring range is extended by utilizing the principle of vernier calipers, and the position of the vernier scale is adjusted by rotating a screw to improve the measurement accuracy.
It enables the expansion of the measuring range without increasing the length of the main scale, improving the portability and measurement accuracy of the measuring scale. It is easy to operate and provides intuitive readings.
Smart Images
Figure CN224415924U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building engineering quality inspection, and in particular to a ruler for measuring the depth of concrete cracks. Background Technology
[0002] Currently, cracks frequently occur in concrete construction, especially in the construction of large-volume concrete. When cracks appear on the concrete surface, especially when the width of the crack is close to or exceeds the standard limit, the depth of the crack becomes very important. Construction and acceptance personnel need to use these indicators to judge the impact of cracks on the structural bearing capacity and durability.
[0003] Traditional measurement methods, such as the chisel method and the ultrasonic method, have limitations. The chisel method requires structural damage and secondary repair after measurement. The ultrasonic method is affected by factors such as the distribution of concrete aggregate and water content, resulting in higher detection errors in complex structures. Existing measuring rulers mostly adopt a single main scale design with limited range, which is difficult to meet the needs of deep crack measurement. In order to increase the range, the length of the main scale needs to be increased, which makes the measuring ruler inconvenient to carry and reduces the portability of the measuring ruler for staff when going out. Therefore, a concrete crack depth measuring ruler is proposed to solve the above problems. Utility Model Content
[0004] To overcome the above shortcomings, this utility model provides a concrete crack depth measuring ruler, which aims to improve the problem in the prior art that "the single main ruler design has a limited range, and increasing the range requires increasing the length of the main ruler, making the measuring ruler inconvenient to carry".
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a concrete crack depth measuring ruler, comprising a main ruler and a secondary ruler. A vernier scale is fitted onto the surface of the main ruler, and a connecting assembly is provided at the bottom of the secondary ruler. The connecting assembly includes a control rod and a frame. The control rod is slidably connected to the inner wall of the main ruler, and a pull rope is fixedly connected to the bottom of the control rod. A locking block is fixedly connected to the end of the pull rope away from the control rod. The locking block is elastically connected to the inner wall of the secondary ruler through a return spring. A protrusion is provided at the bottom of the secondary ruler, and the frame is fixedly connected to the top of the main ruler. A slot is provided on the inner wall of the frame, and a control assembly is provided inside the vernier scale.
[0006] As a further description of the above technical solution:
[0007] The inner wall of the vernier scale is in contact with the outer wall of the main scale.
[0008] As a further description of the above technical solution:
[0009] The card block is cylindrical and is inserted into the card slot.
[0010] As a further description of the above technical solution:
[0011] The outer wall of the protrusion fits against the inner wall of the frame, and the protrusion and the frame are interference-fitted.
[0012] As a further description of the above technical solution:
[0013] The control component includes a screw threadedly connected to the inner wall of the vernier scale. A knob is fixedly connected to the left side of the screw, and the right side of the screw contacts the left side of the main scale.
[0014] As a further description of the above technical solution:
[0015] The control component also includes a horizontal bubble tube, which is fixedly connected to the inner wall of the vernier scale.
[0016] As a further description of the above technical solution:
[0017] The control component also includes a probe and an indicator, the probe being fixedly connected to the bottom of the main scale and the indicator being positioned on the front of the vernier scale.
[0018] As a further description of the above technical solution:
[0019] Both the front of the main scale and the front of the secondary scale are provided with scale lines.
[0020] This utility model has the following beneficial effects:
[0021] 1. In this utility model, by setting a connecting component, the auxiliary ruler and the main ruler can be quickly locked and connected without the need for external tools, thereby increasing the measuring range of the measuring ruler. When the use ends, the main ruler and the auxiliary ruler can be separated by pulling the control lever, thereby reducing the overall length of the measuring ruler and making it easier to carry, thus improving the portability of the measuring ruler.
[0022] 2. In this utility model, by rotating the screw, the position of the vernier scale is adjusted so that the indicator is aligned with the appropriate scale on the vernier scale, thereby reading the depth of the crack. The interference fit between the protrusion and the square further ensures the stability of the connection between the vernier scale and the main scale, and improves the accuracy of the measurement. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;
[0024] Figure 2 This is a three-dimensional cross-sectional view of the auxiliary ruler and connecting components in this utility model;
[0025] Figure 3This is a three-dimensional exploded cross-sectional view of the main scale, vernier scale, and control components in this utility model;
[0026] Figure 4 This utility model Figure 2 A magnified three-dimensional structural diagram at point A in the middle.
[0027] Legend:
[0028] 1. Main scale; 2. Vernier scale; 3. Vernier scale; 101. Control lever; 102. Pull cord; 103. Locking block; 104. Return spring; 105. Protrusion; 106. Frame; 107. Slot; 10. Connecting assembly; 11. Control assembly; 111. Knob; 112. Screw; 113. Horizontal bubble tube; 114. Probe; 115. Indicator; 16. Scale line. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] Reference Figures 1-3 This utility model provides an embodiment of a concrete crack depth measuring ruler, including a main ruler 1 and a secondary ruler 2. The main ruler 1 is the main measuring component, which achieves high-precision length measurement through the principle of vernier calipers. The secondary ruler 2 can extend the main ruler 1, so that the vernier caliper 3 can move onto the secondary ruler 2, thereby increasing the measuring range. The front of the main ruler 1 and the front of the secondary ruler 2 are both provided with scale lines 16. The reading of the scale line 16 of the secondary ruler 2 is an extension of the reading of the scale line 16 of the main ruler 1, so that after the main ruler 1 and the secondary ruler 2 are connected, the reading of the scale line 16 from bottom to top is continuous. The surface of the main ruler 1 is fitted with a vernier caliper 3, and the inner wall of the vernier caliper 3 is in contact with the outer wall of the main ruler 1. The vernier caliper 3 is axially positioned by a control component 11, and the indicator 115 is used as the reading reference for the crack depth. The bottom of the secondary ruler 2 is provided with a connecting component 10.
[0031] Reference Figures 2-4The connecting component 10 includes a control rod 101 and a frame 106. The control rod 101 is slidably connected to the inner wall of the main scale 1. The sliding direction of the control rod 101 is up and down. A pull rope 102 is fixedly connected to the bottom of the control rod 101. The pull rope 102 is not elastic. A locking block 103 with a circular cross-section is fixedly connected to the end of the pull rope 102 away from the control rod 101. There are two sets of locking blocks 103. The locking blocks 103 are cylindrical. The locking blocks 103 are elastically connected to the inner wall of the secondary scale 2 through a return spring 104. The return spring 104 makes the two sets of locking blocks 103 tend to move away from each other.
[0032] Reference Figures 2-4 The bottom of the vernier scale 2 is provided with a protrusion 105 that cooperates with the frame 106. The frame 106 is fixedly connected to the top of the main scale 1. The outer wall of the protrusion 105 fits against the inner wall of the frame 106. The protrusion 105 and the frame 106 are interference fit. The inner wall of the frame 106 is provided with a slot 107 that cooperates with the locking block 103. The locking block 103 is set as a cylinder and is inserted into the slot 107. The vernier scale 3 is provided with a control component 11 inside.
[0033] Reference Figure 1 and Figure 3 The control component 11 includes a screw 112, which is threaded onto the inner wall of the vernier scale 3. When the screw 112 rotates, it can also move linearly in the left and right directions. A knob 111 is fixedly connected to the left side of the screw 112. The surface of the knob 111 is provided with anti-slip texture to prevent slipping. The right side of the screw 112 contacts the left side of the main scale 1. By pressing the main scale 1 against the screw 112, the main scale 1 is fixed relative to the vernier scale 3, so that the reading remains stable when the measuring scale is removed from the crack, thus improving the accuracy of the reading.
[0034] Reference Figure 1 and Figure 3 The control component 11 also includes a horizontal bubble tube 113, which is fixedly connected to the inner wall of the vernier scale 3. The horizontal bubble tube 113 has a built-in liquid calibration reference, so that the measuring scale can be kept horizontal by observing the horizontal bubble tube 113 during measurement. The control component 11 also includes a probe 114 and an indicator 115. The probe 114 is fixedly connected to the bottom of the main scale 1, and the indicator 115 is set on the front of the vernier scale 3. The probe 114 is vertically inserted into the bottom of the crack, and the indicator 115, together with the vernier scale 3, displays the crack depth.
[0035] Working principle: When in use, first insert the probe 114 into the concrete crack, then rotate the screw 112 by the knob 111 in the control component 11 to adjust the position of the vernier caliper 3 so that the indicator 115 is aligned with the appropriate scale on the vernier caliper 3, thereby reading the depth of the crack. At the same time, the horizontal bubble tube 113 ensures that the measuring ruler is kept horizontal, improving the accuracy of the measurement.
[0036] If the position of the vernier scale 2 needs to be adjusted to accommodate deeper cracks, this can be achieved through the connecting assembly 10. Specifically, pull the control lever 101 upwards, causing the pull rope 102 and the locking block 103 to overcome the elasticity of the return spring 104, allowing the locking block 103 to fully enter the interior of the vernier scale 2. Then, insert the protrusion 105 at the bottom of the vernier scale 2 into the square frame 106. Release the control lever 101; under the action of the return spring 104, the locking block 103 engages with the slot 107, thus locking the position of the vernier scale 2. By moving the vernier scale 3 to the surface of the vernier scale 2, the measuring range of the measuring scale can be increased.
[0037] When the measurement is finished and the measuring ruler needs to be stored, the main ruler 1 and the auxiliary ruler 2 are separated by pulling the control lever 101, thereby reducing the overall length of the measuring ruler and making it easier to carry, thus improving its portability. The interference fit between the protrusion 105 and the frame 106 further ensures the stability of the connection between the auxiliary ruler 2 and the main ruler 1. Through the synergistic action of these components, the entire measuring ruler achieves accurate measurement of the depth of concrete cracks, is easy to operate, and provides intuitive readings.
[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A concrete crack depth gauge comprising a main scale (1) and a secondary scale (2), characterised in that: A vernier scale (3) is fitted on the surface of the main scale (1). A connecting component (10) is provided at the bottom of the secondary scale (2). The connecting component (10) includes a control rod (101) and a frame (106). The control rod (101) is slidably connected to the inner wall of the main scale (1). A pull rope (102) is fixedly connected to the bottom of the control rod (101). A locking block (103) is fixedly connected to the end of the pull rope (102) away from the control rod (101). The locking block (103) is elastically connected to the inner wall of the secondary scale (2) through a return spring (104). A protrusion (105) is provided at the bottom of the secondary scale (2). The frame (106) is fixedly connected to the top of the main scale (1). A slot (107) is provided on the inner wall of the frame (106). A control component (11) is provided inside the vernier scale (3).
2. A concrete crack depth ruler according to claim 1, characterized in that: The inner wall of the vernier scale (3) is in contact with the outer wall of the main scale (1).
3. A concrete crack depth ruler as defined in claim 1, wherein: The card block (103) is configured as a cylinder and is inserted into the card slot (107).
4. The concrete crack depth ruler of claim 1, wherein: The outer wall of the protrusion (105) fits against the inner wall of the frame (106), and the protrusion (105) and the frame (106) are interference fit.
5. The concrete crack depth ruler of claim 1, wherein: The control component (11) includes a screw (112) which is threaded onto the inner wall of the vernier scale (3). A knob (111) is fixedly connected to the left side of the screw (112), and the right side of the screw (112) contacts the left side of the main scale (1).
6. A concrete crack depth ruler according to claim 5, wherein: The control component (11) also includes a horizontal bubble tube (113), which is fixedly connected to the inner wall of the vernier scale (3).
7. A concrete crack depth ruler according to claim 6, wherein: The control component (11) also includes a probe (114) and an indicator (115), the probe (114) being fixedly connected to the bottom of the main scale (1), and the indicator (115) being set on the front of the vernier scale (3).
8. The concrete crack depth ruler of claim 1, wherein: The main ruler (1) and the secondary ruler (2) are both provided with scale lines (16).