Concrete crack detection device for building construction

Abstract

The utility model relates to the technical field of buildings, in particular to a concrete crack detection device for building construction, which comprises a conical probe and a support for supporting the probe, and the probe is in sliding connection with the support along the axial direction of the probe; a locking part used for limiting sliding of the probe is arranged between the probe and the support. The problem that a feeler gauge in the prior art has a certain width and is difficult to measure the local width of a bent or bifurcated crack is solved.

Description

Concrete Crack Detection Device for Building Construction Technical Field

[0001] This utility model relates to the field of building technology, specifically to a concrete crack detection device for building construction. Background Technology

[0002] In building construction and structural health monitoring, the detection of concrete cracks is crucial. The width, length, and direction of cracks directly affect the safety, durability, and waterproofing performance of a structure. Excessively wide cracks can lead to steel reinforcement corrosion, concrete spalling, and even affect the overall load-bearing capacity. Therefore, measuring crack width is a key basis for assessing the degree of structural damage and developing repair plans.

[0003] Currently, feeler gauges (metal strips) are commonly used in construction to detect the width of concrete cracks. By inserting feeler gauges of different thicknesses into the crack, the thickness of the feeler gauge is determined by the protrusions on both sides of the crack against the gauge, and this thickness is considered the minimum width of the section of the crack being tested. However, feeler gauges have a certain width, making it difficult to measure the local width of curved or bifurcated cracks (such as L-shaped or Y-shaped cracks). Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a concrete crack detection device for building construction, so as to solve the problem that the feeler gauge has a certain width and it is difficult to measure the local width of curved or bifurcated cracks in the prior art.

[0005] This utility model is achieved through the following technical solution:

[0006] A concrete crack detection device for building construction includes a conical probe and a support for supporting the probe, wherein the probe and the support are slidably connected along the probe axis.

[0007] A locking part is provided between the probe and the support to limit the sliding of the probe.

[0008] Furthermore, the support includes a horizontal plate and two columns symmetrically arranged around the probe, with the probe's pointed end slidably connected to the horizontal plate along the probe's axial direction.

[0009] One end of the column is fixedly connected to the horizontal plate, and the other end extends along the probe axis toward the probe tip.

[0010] Furthermore, a through hole is provided in the middle of the horizontal plate, and a sliding rod adapted to the through hole is provided on the pointed end of the probe. One end of the sliding rod is connected to the probe, and the other end extends along the probe axis and is inserted into the through hole and slides in cooperation with the through hole.

[0011] Furthermore, the outer wall of the slide bar is engraved with scale lines evenly arranged along the probe axis.

[0012] Furthermore, a threaded hole is provided on the end face of the slide rod facing the probe, and the probe is inserted into the threaded hole at the sharp end facing away from the probe and connected by a threaded engagement.

[0013] Furthermore, the locking part includes a friction strip extending axially toward the probe, and a storage groove for storing the friction strip is provided on the side wall of the slide bar;

[0014] The friction strip is embedded in the storage groove and slides in the storage groove along the probe radial direction;

[0015] The slide bar is provided with an adjustment part for adjusting the position of the friction strip in the storage groove. The adjustment part can drive the friction strip to slide out of the storage groove opening and press against the side wall of the through hole.

[0016] Furthermore, the slide bar is hollow inside, the receiving groove is connected to the inside of the slide bar on the side opposite to the opening, and the adjustment part includes a control lever, a first connecting rod and a second connecting rod embedded inside the slide bar. One end of the control lever extends axially toward the probe, passes through the end wall of the slide bar opposite to the probe, extends out of the slide bar, and is rotatably engaged.

[0017] One end of the first connecting rod is fixedly connected to the middle of the control lever, and the other end extends radially along the control lever;

[0018] One end of the second link is hinged to the end of the first link facing away from the control lever, and the rotation center line is parallel to the axis of the control lever; the other end is hinged to the middle of the friction plate.

[0019] When the friction strip is in a state of compression and contact with the side wall of the through hole, the first connecting rod and the second connecting rod are on the same straight line.

[0020] Furthermore, a notch adapted to the friction strip is provided on the side wall opposite to the through hole, and the friction strip is inserted into the notch in an interference fit state.

[0021] Furthermore, the friction bar has two chamfered edges on the side facing away from the control lever along the circumference of the control lever, and the notch is provided with two contact planes that correspond one-to-one with the two chamfered surfaces of the friction bar.

[0022] The contact plane is parallel to the corresponding inclined surface on the friction strip, and the inclined surface on the friction strip can press against the corresponding contact inclined surface.

[0023] Furthermore, the control stick is provided with a handle at the end facing away from the probe. The handle is long and perpendicular to the control stick, and the middle part of the handle is fixedly connected to the control stick.

[0024] The beneficial effects of this utility model are as follows:

[0025] This concrete crack detection device for building construction uses a probe instead of a feeler gauge to measure crack width. The probe tip is inserted perpendicularly into the crack, with the conical surface of the probe abutting the edge of the crack on the detection surface. The diameter of the probe at the point of contact is considered the width of that detection point, thus achieving the purpose of measuring crack width. Simultaneously, the conical probe, through its progressive contact with the conical surface, automatically adapts to the undulations of the crack sidewalls, making it easy to insert into curved, bifurcated, or narrow cracks for width detection.

[0026] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0027] Figure 1 is a three-dimensional structural diagram of an embodiment of the present utility model;

[0028] Figure 2 is a schematic diagram of the planar structure of an embodiment of the present utility model;

[0029] Figure 3 is an exploded view of an embodiment of this utility model;

[0030] Figure 4 is a three-dimensional structural diagram of the slide bar in an embodiment of this utility model;

[0031] Figure 5 is a cross-sectional view of AA in Figure 2;

[0032] Figure 6 shows a cross-sectional view of BB in Figure 2 (State 1);

[0033] Figure 7 shows a cross-sectional view of BB in Figure 2 (State 2).

[0034] In the diagram: 1. Probe; 21. Horizontal plate; 211. Through hole; 212. Notch; 22. Column; 3. Slide rod; 31. Scale line; 32. Threaded hole; 33. Storage groove; 4. Friction strip; 51. Control lever; 52. First connecting rod; 53. Second connecting rod; 6. Handle. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0040] Please refer to Figures 1-7. This utility model provides a technical solution: a concrete crack detection device for building construction, including a conical probe 1 and a bracket for supporting the probe 1, wherein the probe 1 and the bracket are slidably connected along the axial direction of the probe 1.

[0041] A locking part is provided between the probe 1 and the bracket to limit the sliding of the probe 1.

[0042] In this scheme, a probe 1 is used instead of a feeler gauge to measure the crack width. By inserting the tip of probe 1 perpendicularly into the crack, the conical surface of probe 1 abuts against the edge of the crack on the detection surface. The diameter of probe 1 at the point of contact is considered as the width of that detection point, thus achieving the purpose of measuring the crack width. Simultaneously, the conical probe 1, through its progressive contact with the conical surface, can automatically adapt to the undulations of the crack sidewall, making it easy to insert into curved, bifurcated, or narrow cracks for width measurement.

[0043] The bracket is used to support and guide the probe 1. A support plate can be set on the bracket so that the axis of the support plate is parallel to the axis of the probe 1. By using one end face of the support plate to contact and abut the surface to be tested, the probe 1 slides on the bracket in a direction perpendicular to the surface to be tested (the axis of the probe 1), so that the probe 1 moves smoothly into the gap, reducing the risk of the probe 1 tilting and increasing the detection error.

[0044] Alternatively, when measuring the diameter of the contact point, a rope can be wrapped around the circumference corresponding to the contact point of probe 1. The circumference (C) can be obtained by measuring the length of the rope, and the diameter (D) can be calculated using the following formula:

[0045] C = π × D

[0046] Alternatively, the diameter (D) can be calculated by measuring the distance (ΔL) of the axial movement of probe 1 and using the following formula:

[0047] D=D0+K×ΔL=0.2mm+0.1×ΔL

[0048] Taper ratio (K): e.g., 1:10;

[0049] Initial diameter (D0): Assume the tip diameter of probe 1 is 0.2 mm (close to the tip of a needle).

[0050] Here, it is preferable to measure the distance (ΔL) of the axial movement of probe 1. It can be seen that, with a taper ratio of 1:10, the diameter of probe 1 increases or decreases by 1 mm for every 10 mm of axial movement.

[0051] The usage steps are as follows:

[0052] Step 1: Press the support plate of the detection device tightly against the concrete detection surface, ensuring that the axis of probe 1 is perpendicular to the direction of the crack. Loosen the locking part so that probe 1 can slide freely along the axis of the support. When the tip of probe 1 is in contact with the surface to be detected, the position of probe 1 on the support is taken as the initial state.

[0053] Step 2: Slowly push probe 1 so that the tip (D0 = 0.2 mm) enters the crack vertically until the conical surface is in complete contact with the sidewall of the crack. When probe 1 can no longer move down, immediately lock the locking part to fix the position of probe 1.

[0054] Step 3: Measure the axial movement distance of probe 1 (e.g., ΔL = 6mm) and calculate the gap width (D = 0.8mm). External equipment can be used for measurement (e.g., rulers, displacement sensors (e.g., Wuxi Hongchuan Technology LTM-050)).

[0055] For higher accuracy, multiple measurements can be taken and the average value taken, or a smaller taper ratio (such as 1:20) can be used.

[0056] In this embodiment: the support includes a horizontal plate 21 and two columns 22 symmetrically arranged with the probe 1 as the center. The probe 1 is slidably connected to the horizontal plate 21 along the probe 1 axis at the sharp end facing away from the probe.

[0057] One end of the column 22 is fixedly connected to the horizontal plate 21, and the other end extends along the axial direction of the probe 1 toward the tip of the probe 1.

[0058] In this design, a U-shaped structure is formed by splicing a horizontal plate 21 and two uprights 22. The probe 1 is placed between the two uprights 22, and the two uprights 22 can contact and abut against the detection surfaces on both sides of the crack, so that the position (alignment with the crack) of the probe 1 and the movement of the probe 1 can be observed through the gap between the two uprights 22.

[0059] In this embodiment: a through hole 211 is provided in the middle of the horizontal plate 21, and a slide rod 3 adapted to the through hole 211 is provided on the opposite sharp end of the probe 1. One end of the slide rod 3 is connected to the probe 1, and the other end extends along the axial direction of the probe 1 and is inserted into the through hole 211 and slides in cooperation with the through hole 211.

[0060] In this design, the slide bar 3 is prismatic in shape, and the through hole 211 is adapted to the shape of the slide bar 3. After the slide bar 3 is inserted into the through hole 211, it can only slide along its length (axial direction of the probe 1), assisting the movement of the probe 1. The end of the slide bar 3 facing away from the probe 1 is defined as the control end. The distance (ΔL) that the probe 1 moves along the axial direction can be obtained by measuring the length of the control end protruding from the horizontal plate 21.

[0061] In this embodiment: the outer wall of the slide bar 3 is engraved with scale lines 31 that are evenly arranged along the axial direction of the probe 1.

[0062] In this scheme, the scale line 31 can be used to represent the length of the section of the slide bar 3 protruding from the horizontal plate 21, or to represent the diameter of the contact point of the probe 1 (obtained by conversion based on the taper ratio of the probe 1), providing convenience for relevant technical personnel.

[0063] In this embodiment: a threaded hole 32 is provided on the end face of the slide rod 3 facing the probe 1, and the probe 1 is inserted into the threaded hole 32 at the sharp end facing away from it and connected by threaded engagement.

[0064] In this design, probe 1 and slide bar 3 are detachably fixedly connected, allowing probe 1 to be disassembled for maintenance or replacement. Multiple probes 1 with different taper ratios (e.g., 1:10, 1:20, etc.) can also be set, with the appropriate probe 1 selected according to usage requirements.

[0065] In this embodiment: the locking part includes a friction strip 4 extending axially toward the probe 1, and a storage groove 33 for storing the friction strip 4 is provided on the side wall of the slide rod 3;

[0066] The friction strip 4 is embedded in the storage groove 33 and slides in the storage groove 33 radially along the probe 1;

[0067] The slide bar 3 is provided with an adjustment part for adjusting the position of the friction strip 4 in the storage groove 33. The adjustment part can drive the friction strip 4 to slide out of the opening of the storage groove 33 and press against the side wall of the through hole 211.

[0068] In this design, the axial position of the probe 1 is precisely locked by the sliding fit between the friction strip 4 and the receiving groove 33. The friction strip 4 is driven to move radially out of the probe 1 by the adjustment part, forming a surface contact and pressing with the side wall of the through hole 211. The friction force is evenly distributed, preventing the slide rod 3 from sliding accidentally and ensuring that the position of the probe 1 is fixed during the measurement process.

[0069] The receiving groove 33 is adapted to the friction strip 4. When the friction strip 4 is embedded in the receiving groove 33, it can only slide radially and cannot move axially, thus directly restricting the axial movement of the slide rod 3. The long strip-shaped friction strip 4 extends axially along the probe 1, increasing the contact area with the through hole 211 and reducing local wear.

[0070] The friction strip 4 is made of a high friction coefficient material (such as nitrile rubber, polyurethane elastomer, etc.) and is suitable for anti-slip needs in different environments (humid, dusty). A rigid strip or plate is provided on the side wall of the friction strip 4 facing away from the opening of the storage groove 33 to support the friction strip 4.

[0071] In this embodiment: the slide rod 3 is hollow inside, the receiving groove 33 is connected to the inside of the slide rod 3 on the side opposite to the opening, and the adjustment part includes a control rod 51, a first connecting rod 52 and a second connecting rod 53 embedded inside the slide rod 3. One end of the control rod 51 extends axially toward the probe 1, passes through the end wall of the slide rod 3 opposite to the probe 1, extends out of the slide rod 3, and is rotatably engaged.

[0072] One end of the first connecting rod 52 is fixedly connected to the middle of the control lever 51, and the other end extends radially along the control lever 51;

[0073] One end of the second link 53 is hinged to one end of the first link 52 facing away from the control lever 51, and the rotation center line is parallel to the axis of the control lever 51. The other end is hinged to the middle of the friction plate.

[0074] When the friction strip 4 is in a state of compression and contact with the side wall of the through hole 211, the first connecting rod 52 and the second connecting rod 53 are on the same straight line.

[0075] In this design, the friction strip 4 can slide within the storage groove 33 in the following two states:

[0076] State 1, as shown in Figure 6, the friction strip 4 moves out from the opening of the storage groove 33 and presses against the side wall of the through hole 211. The friction strip 4 is compressed and shrinks into an elastic energy storage state. The first connecting rod 52 and the second connecting rod 53 form a straight line and constitute a "dead point position" (translation: the connecting rod mechanism is at the critical position where the force lines coincide, and the mechanism is self-locking at this time), which produces a self-locking effect and can automatically maintain the locking force without the need to continuously apply external force.

[0077] State 2: As shown in Figure 7, the friction strip 4 is fully retracted into the storage groove 33, and the first connecting rod 52 and the second connecting rod 53 form an angle, releasing the self-locking state. At this time, the probe 1 can slide freely along the axial direction, which facilitates quick adjustment of the measurement position.

[0078] The locked / unlocked state can be quickly switched by rotating the joystick 51, making operation simple and efficient.

[0079] In this embodiment: a notch 212 adapted to the friction strip 4 is provided on the side wall opposite to the through hole 211, and the friction strip 4 is inserted into the notch 212 in an interference fit state.

[0080] In this design, by pushing the friction strip 4 into the notch 212, the two side walls of the notch 212 compress the friction strip 4 along the circumferential direction of the probe 1. The friction strip 4 elastically stores energy, and the rebound force is the positive pressure applied to the side walls of the notch 212, increasing the friction force and restricting the friction strip 4 from sliding along its length. Furthermore, when the friction strip 4 is in state two, a locking effect can still be generated when the friction strip 4 and the notch 212 are tightly connected, without the need for precise control of the first link 52 and the second link 53 to form a "dead position," thus reducing the difficulty of operation.

[0081] In this embodiment: the friction strip 4 has two chamfered edges on the side facing away from the control lever 51 along the circumference of the control lever 51, and the notch 212 is provided with two contacting planes that correspond one-to-one with the two chamfered surfaces of the friction strip 4.

[0082] The contact plane is parallel to the corresponding inclined surface on the friction strip 4, and the inclined surface on the friction strip 4 can press against the corresponding contact inclined surface.

[0083] In this design, the double-angled design of the friction strip 4, in parallel with the contact plane, forms a surface contact lock. Compared with traditional point contact or single-angled structure, the force is more uniform, avoiding slippage or deformation caused by local stress concentration. In the locked state (state one), the bidirectional compression of the two pairs of angled surfaces provides symmetrical frictional force, enhancing locking reliability and preventing the probe 1 from accidentally loosening during measurement.

[0084] The guiding effect of the inclined surface of friction strip 4 and the contact plane makes friction strip 4 move out or retract more smoothly, reducing jamming and improving adjustment efficiency.

[0085] In this embodiment: the control lever 51 is provided with a handle 6 at one end facing away from the probe 1. The handle 6 is long and perpendicular to the control lever 51. The middle part of the handle 6 is fixedly connected to the control lever 51.

[0086] In this design, the handle 6 is held by relevant technicians to facilitate the rotation of the control lever 51. When the friction strip 4 is in state two, the two ends of the handle 6 point to the two pillars 22 respectively, assisting the relevant technicians in adjusting the position of the friction strip 4 by controlling the control lever 51.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A concrete crack detection device for building construction, characterized in that: It includes a conical probe (1) and a support for supporting the probe (1), wherein the probe (1) and the support are slidably connected along the axial direction of the probe (1); a locking part is provided between the probe (1) and the support to limit the sliding of the probe (1).

2. The concrete crack detection device for building construction according to claim 1, characterized in that: The support includes a horizontal plate (21) and two columns (22) symmetrically arranged around the probe (1). The probe (1) is slidably connected to the horizontal plate (21) along the probe (1) axis with one end facing away from the sharp end. One end of the column (22) is fixedly connected to the horizontal plate (21), and the other end extends along the probe (1) axis toward the tip of the probe (1).

3. The concrete crack detection device for building construction according to claim 2, characterized in that: The horizontal plate (21) has a through hole (211) in the middle. The probe (1) has a slide rod (3) that is adapted to the through hole (211) at the sharp end facing away. One end of the slide rod (3) is connected to the probe (1), and the other end extends along the axial direction of the probe (1) and is inserted into the through hole (211) and slides in cooperation with the through hole (211).

4. The concrete crack detection device for building construction according to claim 3, characterized in that: The outer wall of the slide bar (3) is engraved with scale lines (31) evenly arranged along the axial direction of the probe (1).

5. The concrete crack detection device for building construction according to claim 3, characterized in that: The slide bar (3) has a threaded hole (32) on the end face facing the probe (1). The probe (1) is inserted into the threaded hole (32) at the sharp end facing away and is connected by a threaded engagement.

6. The concrete crack detection device for building construction according to claim 3, characterized in that: The locking part includes a friction strip (4) extending axially toward the probe (1), and a receiving groove (33) for receiving the friction strip (4) is provided on the side wall of the slide rod (3); the friction strip (4) is embedded in the receiving groove (33) and slides in cooperation with the receiving groove (33) radially along the probe (1); the slide rod (3) is provided with an adjustment part for adjusting the position of the friction strip (4) in the receiving groove (33), and the adjustment part can drive the friction strip (4) to slide out of the opening of the receiving groove (33) and press against the side wall of the through hole (211).

7. The concrete crack detection device for building construction according to claim 6, characterized in that: The slide rod (3) is hollow inside. The receiving groove (33) is connected to the inside of the slide rod (3) on the side facing away from the opening. The adjustment part includes a control rod (51), a first connecting rod (52) and a second connecting rod (53) embedded inside the slide rod (3). One end of the control rod (51) extends axially toward the probe (1) and passes through the end wall of the slide rod (3) facing away from the probe (1), extending out of the slide rod (3) and rotating. One end of the first connecting rod (52) is fixedly connected to the middle of the control rod (51), and the other end extends radially along the control rod (51). One end of the second connecting rod (53) is hinged to the end of the first connecting rod (52) facing away from the control rod (51), and the rotation center line is parallel to the axis of the control rod (51). The other end is hinged to the middle of the friction plate. When the friction strip (4) and the side wall of the through hole (211) are in a state of compression and contact, the first connecting rod (52) and the second connecting rod (53) are on the same straight line.

8. The concrete crack detection device for building construction according to claim 6, characterized in that: The through hole (211) has a notch (212) on the side wall opposite to the friction strip (4) that is adapted to the friction strip (4). The friction strip (4) is inserted into the notch (212) and is in an interference fit state.

9. The concrete crack detection device for building construction according to claim 8, characterized in that: The friction strip (4) has two chamfered edges on the side facing away from the control lever (51) along the circumference of the control lever (51). The notch (212) has two contact planes that correspond one-to-one with the two chamfered surfaces of the friction strip (4). The contact planes are parallel to the corresponding chamfered surfaces on the friction strip (4), and the chamfered surfaces on the friction strip (4) can press against the corresponding contact chamfered surfaces.

10. The concrete crack detection device for building construction according to claim 7, characterized in that: The control lever (51) has a handle (6) at one end facing away from the probe (1). The handle (6) is long and perpendicular to the control lever (51). The middle part of the handle (6) is fixedly connected to the control lever (51).

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