A monitoring device for maximum crack width and a method of using the same

Abstract

The present invention discloses a monitoring device for the maximum width of a crack and a method for using the same, comprising a movable bottom plate and a sliding part, wherein the bottom plate is also provided with a housing, a fixed scale is provided on one side of the bottom plate through screw assembly connection, the sliding part comprises a pull rod that slides through the fixed scale and is slidably fitted on the bottom plate, and a sliding scale installed on the pull rod, a fixed flange is fixedly connected to the side of the bottom plate close to the sliding scale, and a movable flange symmetrical to the fixed flange is fixedly connected to one end of the pull rod close to the fixed scale, and when the fixed flange and the movable flange are installed and fixed, the end of the pull rod abuts against the fixed flange. The present invention can obtain the real-time width of the crack by measuring the relative position of the fixed scale on the pull rod; and obtain the maximum width of the crack since the device is installed by measuring the relative position of the sliding scale on the pull rod; such a design does not require high-frequency measurement to collect data, and can automatically obtain data in real time.

Description

Technical Field

[0001] The invention relates to the technical field of crack measurement, in particular to a monitoring device for maximum crack width and a use method thereof. Background Art

[0002] Fixed facilities of concrete structures such as bridges and dams involve various aspects from construction to use, including design, construction, supervision, and operation management. Therefore, any deficiency in any aspect will lead to cracks in the concrete structure. For example, design omissions, poor construction, and poor supervision may all cause cracks in the concrete structure. Therefore, strictly following the relevant national specifications and technical standards for design, construction, and supervision is the premise and basis for ensuring the safety and durability of the structure. In the process of operation and management, further strengthening inspections and management, and timely discovering and handling problems are also very important links.

[0003] Cracks are a potential hazard to concrete structure fixed facilities such as bridges and dams. Detecting and monitoring cracks in important engineering facilities is a future development trend. At present, the crack width monitoring of concrete structures generally uses vibrating wire strain sensors, capacitive displacement meters or image ranging sensors, which can measure the real-time width of cracks.

[0004] However, when evaluating the performance of facilities such as bridges, it is sometimes necessary to know the maximum width of the crack under heavy load. Since heavy loads occur occasionally under normal circumstances, if vibrating wire sensors or capacitive displacement meters are used to monitor the maximum width of cracks, the measurement system needs to collect data at high frequency for a long time, which has high requirements for field battery power supply and wireless data transmission. Summary of the invention

[0005] The object of the present invention is to provide a monitoring device for the maximum width of a crack and a method for using the same, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A monitoring device for the maximum width of a crack comprises a movably assembled base plate and a sliding member, the base plate is also covered with a shell, a fixed scale is arranged on one side of the base plate through a screw assembly connection, the sliding member comprises a pull rod which slides through the fixed scale and is slidably fitted on the base plate, and a sliding scale mounted on the pull rod, a fixed flange is fixedly connected to the side of the base plate near the sliding scale, and a movable flange symmetrical to the fixed flange is fixedly connected to one end of the pull rod near the fixed scale, when the fixed flange and the movable flange are installed and fixed, the sliding scale and the fixed scale are movably fitted.

[0008] Furthermore, a plurality of assembly holes are provided through the upper edge of the bottom plate, and the lower end of the shell is movably engaged with the assembly holes by connecting screws.

[0009] Furthermore, the shell is made of plastic material, and a PCB, a battery and a wireless connection structure that are electrically connected to form a loop are integrated in the shell, and two ends of the shell are embedded between the fixing flanges and the pull rods on both sides.

[0010] Furthermore, a first fixing hole is provided through the fixing flange, and a second fixing hole corresponding to the position of the first fixing hole is provided through the movable flange.

[0011] Furthermore, a first sliding through hole is embedded in the lower end of the fixed ruler, and the pull rod slides through the first sliding through hole. The fixed ruler and the pull rod are elastically connected via an elastic spring sheet arranged in the first sliding through hole.

[0012] Furthermore, a second sliding through hole is embedded in the lower end of the sliding ruler, the pull rod passes through the second sliding through hole, and the sliding ruler and the pull rod are elastically connected via an elastic spring sheet arranged in the second sliding through hole.

[0013] Furthermore, a moving gate sensor is also installed in the pull rod, and the moving gate sensor is electrically connected to the PCB.

[0014] Furthermore, capacitive sensors are installed in both the fixed scale (13) and the sliding scale (33), and the capacitive sensors are electrically connected to the PCB.

[0015] A method for using a crack maximum width monitoring device comprises the following steps:

[0016] 1) Install the capacitive grid sensor on one side of the fixed scale and the sliding scale, and the capacitive grid sensor is on the upper side of the pull rod;

[0017] 2) Install a moving grid circuit board on the pull rod, and the moving grid circuit board is opposite to but not in contact with the capacitive grid sensors on the fixed scale and the sliding scale;

[0018] 3) Fix the base and the pull rod on both sides of the crack respectively;

[0019] 4) By transmitting a square wave signal to the capacitive barrier sensor through the PCB, the relative position of the capacitive barrier sensor and the moving barrier sensor, as well as the relative position of the capacitive barrier sensors can be measured; by measuring the relative position of the fixed ruler on the pull rod through the above data, the real-time width of the crack can be obtained; by measuring the relative position of the sliding ruler on the pull rod, the maximum width of the crack since the device was installed can be obtained.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the first fixing holes and the second fixing holes on the base plate and the sliding member are fixed to the two sides of the crack by screws or bolts. When the crack opens, the base plate and the sliding member slide in the first sliding through hole in the fixed scale through the pull rod to separate. At this time, the sliding scale will move with the pull rod due to the action of the elastic spring, but its movement will be limited by the fixed scale. When the load decreases, the crack width will decrease. At this time, the pull rod will be driven by the movable flange to move towards the base plate, and the sliding scale will also move with the pull rod due to the tensioning effect of the elastic spring. By measuring the relative position of the fixed scale on the pull rod, the real-time width of the crack can be obtained; by measuring the relative position of the sliding scale on the pull rod, the maximum width of the crack since the device was installed can be obtained; such a design does not require high-frequency measurement to collect data, and can automatically obtain data in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the structure of a monitoring device for the maximum width of a crack.

[0022] Figure 2 The figure is a schematic diagram of the connection between the bottom plate and the sliding part in a monitoring device for the maximum width of cracks.

[0023] Figure 3 The figure is a schematic diagram of the structure of a sliding part in a monitoring device for maximum crack width.

[0024] In the figure: 1-base plate, 11-fixed flange, 111-first fixed hole, 12-assembly hole, 13-fixed scale, 131-first sliding through hole, 2-housing, 3-sliding member, 31-pull rod, 32-movable flange, 321-second fixed hole, 33-sliding scale, 331-second sliding through hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 3In an embodiment of the present invention, a monitoring device for the maximum width of a crack includes a movably assembled base plate 1 and a sliding member 3, the base plate 1 is also covered with a housing 2, a fixed scale 13 is provided on one side of the base plate 1 through a screw assembly connection, the sliding member 3 includes a pull rod 31 that slides through the fixed scale 13 and is slidably fitted on the base plate 1, and a sliding scale 33 installed on the pull rod 31, a fixed flange 11 is fixedly connected to the side of the base plate 1 near the sliding scale 33, and a movable flange 32 symmetrical to the fixed flange 11 is fixedly connected to one end of the pull rod 31 near the fixed scale 13, when the fixed flange 11 and the movable flange 32 are installed and fixed, the sliding scale 33 and the fixed scale 13 are movably fitted, in order to ensure that the sliding scale 33 and the fixed scale 13 fit after installation, an inspection hole can also be provided on the base plate 1, so that the sliding scale 33 can be adjusted and moved using a tool to ensure the fitting effect.

[0027] The upper edge of the base plate 1 is penetrated by a plurality of assembly holes 12, and the lower end of the shell 2 is movably engaged with the assembly holes 12 by connecting screws. The shell 2 is a plastic shell, and a PCB Printed Circuit Board, a printed circuit board, a battery and a wireless connection structure that are electrically connected to form a loop are integrated in the shell 2. The two ends of the shell 2 are embedded between the fixing flanges 11 and the pull rods 31 on both sides.

[0028] The fixed flange 11 is penetrated with a first fixing hole 111, and the movable flange 32 is penetrated with a second fixing hole 321 corresponding to the position of the first fixing hole 111, so that the base plate 1 and the sliding member 3 can be fixed on both sides of the crack through the first fixing hole 111 and the second fixing hole 321, thereby facilitating automatic monitoring of the opening of the crack.

[0029] The fixed ruler 13 has a first sliding hole 131 embedded in its lower end, and the pull rod 31 slides through the first sliding hole 131, and an elastic connection is formed between the fixed ruler 13 and the pull rod 31 via an elastic spring sheet arranged in the first sliding hole 131; the sliding ruler 33 has a second sliding hole 331 embedded in its lower end, and the pull rod 31 passes through the second sliding hole 331, and an elastic connection is formed between the sliding ruler 33 and the pull rod 31 via an elastic spring sheet arranged in the second sliding hole 331, and the elastic spring sheet is designed to generate tension to prevent the sliding ruler 33 from sliding at will.

[0030] The pull rod 31 is also equipped with a moving gate sensor, and the moving gate sensor is electrically connected to the PCB.

[0031] The fixed scale 13 and the sliding scale 33 are both equipped with capacitive sensors and are electrically connected to the PCB, so that changes in the crack opening can form data signals in real time and be transmitted to the PCB for storage, and the data can be transmitted through a wireless connection structure.

[0032] The first fixing holes 111 and the second fixing holes 321 on the base plate 1 and the sliding member 3 are fixed to the two sides of the crack by screws or bolts. When the crack opens, the base plate 1 and the sliding member 3 slide in the first sliding hole 131 in the fixed scale 13 through the pull rod 31 to separate. At this time, the sliding scale 33 will move with the pull rod 31 due to the action of the elastic spring, but its movement will be limited by the fixed scale 13. When the load decreases, the crack width will decrease. At this time, the pull rod 31 will be driven by the movable flange 32 to move towards the base plate 1, and the sliding scale 33 will also move with the pull rod 31 due to the tensioning effect of the elastic spring. By measuring the relative position of the fixed scale 13 on the pull rod, the real-time width of the crack can be obtained; by measuring the relative position of the sliding scale 33 on the pull rod, the maximum width of the crack since the installation of the device can be obtained.

[0033] A method for using a crack maximum width monitoring device comprises the following steps:

[0034] 1) A capacitive grid sensor is installed on one side of the fixed scale 13 and the sliding scale 33, and the capacitive grid sensor is on the upper side of the pull rod 31;

[0035] 2) Install a moving grid circuit board on the pull rod 31, the moving grid circuit board is opposite to but not in contact with the capacitive grid sensors on the fixed scale 13 and the sliding scale 33;

[0036] 3) The base 1 and the rod 31 are fixed on both sides of the crack respectively. When the crack opens, the rod 31 and the base 1 will separate. When the rod 31 and the base 1 separate, the sliding scale 33 will move with the rod 31 due to the action of the elastic spring, but its movement will be limited by the fixed scale 13. When the load decreases, the crack width will decrease. At this time, the rod 31 and the base 1 will move toward each other, and the sliding scale 33 will also move with the rod 31 due to the tension of the elastic spring.

[0037] 4) The PCB transmits a square wave signal to the capacitive barrier sensor, so as to measure the relative position of the capacitive barrier sensor and the dynamic barrier sensor, as well as the relative position of the capacitive barrier sensors. By measuring the relative position of the fixed scale 13 on the pull rod 31 through the above data, the real-time width of the crack can be obtained; by measuring the relative position of the sliding scale 33 on the pull rod 31, the maximum width of the crack since the device was installed can be obtained.

[0038] Measuring relative displacement with a capacitive barrier is a mature technology and the principle will not be introduced here.

[0039] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A monitoring device for the maximum width of a crack, comprising a movable bottom plate (1) and a sliding member (3), wherein a housing (2) is also provided on the bottom plate (1), characterized in that: A fixed scale (13) is assembled and connected on one side of the base plate (1), and the sliding member (3) comprises a pull rod (31) that slides through the fixed scale (13) and is slidably fitted on the base plate (1), and a sliding scale (33) mounted on the pull rod (31). A fixed flange (11) is fixedly connected on the side of the base plate (1) near the sliding scale (33), and a movable flange (32) symmetrical to the fixed flange (11) is fixedly connected on one end of the pull rod (31) near the fixed scale (13). When the fixed flange (11) and the movable flange (32) are fixedly installed, the sliding scale (33) and the fixed scale (13) are movably fitted; The fixed ruler (13) is embedded with a first sliding through hole (131) at the lower end, and the pull rod (31) slides through the first sliding through hole (131), and the fixed ruler (13) and the pull rod (31) are elastically connected via an elastic spring sheet arranged in the first sliding through hole (131); The lower end of the sliding ruler (33) is embedded with a second sliding through hole (331), the pull rod (31) passes through the second sliding through hole (331), and the sliding ruler (33) and the pull rod (31) are elastically connected via an elastic spring sheet arranged in the second sliding through hole (331); The upper edge of the bottom plate (1) is provided with a plurality of assembly holes (12), and the lower end of the housing (2) is movably engaged with the assembly holes (12) by connecting screws therebetween; The housing (2) is made of plastic material, and a PCB, a battery, and a wireless connection structure that are electrically connected to form a loop are integrated in the housing (2), and both ends of the housing (2) are embedded between the fixing flanges (11) and the pull rods (31) on both sides; The fixed flange (11) is provided with a first fixing hole (111), and the movable flange (32) is provided with a second fixing hole (321) corresponding to the position of the first fixing hole (111); The pull rod (31) is also equipped with a dynamic gate sensor, and the dynamic gate sensor is electrically connected to the PCB; Capacitive sensors are installed in both the fixed scale (13) and the sliding scale (33), and the capacitive sensors are electrically connected to the PCB.

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