Branch pipe assembly for measuring deflection of bridge and measuring device
By converting liquid level changes into electrical signals using a branch pipe assembly for bridge deflection measurement, the problem of requiring manual confirmation in existing equipment is solved, enabling automation and remote monitoring of bridge deflection measurement, reducing costs and improving efficiency.
Patent Information
- Application Number
- CN202423074109.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When testing bridges with large spans or under dynamic loads, existing bridge deflection measurement equipment requires manual verification of the position of each test point in real time. This is especially true during dynamic load testing, where manual verification of displacement changes at each test point is necessary, resulting in low efficiency.
Design a branch pipe assembly for measuring bridge deflection. The liquid level change of the float in the connecting pipe is converted into an electrical signal. The liquid level change is converted into a resistance value change by the guide sleeve and follower assembly. Combined with information acquisition and processing device, remote monitoring is realized.
It has enabled the automation and remote monitoring of bridge deflection measurement, reduced manual intervention, lowered material costs, and improved testing efficiency.
Smart Images
Figure CN223623807U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engineering testing, and in particular to a branch pipe assembly and measuring device for bridge deflection testing. Background Technology
[0002] Bridge deflection is a key technical indicator for measuring a bridge's load-bearing capacity and safety under gravity. Deflection testing equipment for bridge structures can be categorized into contact and non-contact types. Contact equipment includes dial indicators and deflectometers with test stands, while non-contact equipment includes total stations, image-based deflectometers, microwave radar, and connecting tubes. Connecting tubes are a simple device for measuring bridge deflection, offering high reliability and very low cost, making them widely used in engineering. However, for large spans and numerous test points, especially during dynamic load testing, personnel are required to be present at each test point to manually verify and report displacement changes at the same time. Summary of the Invention
[0003] Based on the aforementioned technical problems in the existing technology, this utility model proposes a branch pipe assembly and measuring device for measuring bridge deflection, which facilitates the conversion of liquid level changes caused by bridge flexural deformation into electrical signals and enables remote monitoring.
[0004] The branch pipe assembly for bridge deflection measurement includes:
[0005] - The connecting pipe assembly includes a vertical pipe body, a liquid inlet pipe at the bottom of the pipe body, and an atmospheric connecting pipe at the top of the pipe body. An end cap is provided at the top of the pipe body.
[0006] - A frame assembly, placed on the end cap, including a vertical section fixed to the end cap and a longitudinal section extending laterally from the upper end of the vertical section;
[0007] -Guide assembly, including guide sleeve and guide sleeve fixing member, the guide sleeve is vertically arranged and passes through the end cap, the guide sleeve is fixed to the tube body by the guide sleeve fixing member, and the guide sleeve is a good conductor;
[0008] - The follower assembly includes a float, a metal slide bar, a metal crossbar, and a first movable contact wheel. The float is placed inside the tube body. The metal slide bar is placed vertically and coaxially inside the guide sleeve. The lower end of the metal slide bar is connected to the float, and the upper end of the metal slide bar is fixed to the metal crossbar. The lateral end of the metal crossbar is provided with a rotatable first movable contact wheel. The metal slide bar, the metal crossbar, and the first movable contact wheel are electrically connected.
[0009] - A resistor assembly includes a first elastic element, a first resistance wire, a first terminal, and a first anchor point, all located in the same vertical plane. The first terminal and the first anchor point are respectively fixedly arranged on the end cap and the longitudinal section, or the first terminal and the first anchor point are respectively fixedly arranged on the longitudinal section and the end cap. The first end of the first elastic element is connected to the first end of the first resistance wire. The second end of the first resistance wire is fixedly connected to and electrically connected to the first terminal. The second end of the first elastic element is fixedly connected to the first anchor point. During the vertical sliding of the first movable contact wheel with the metal slide rod, the first elastic element is in a stretched state, causing the first resistance wire to always abut against and be electrically connected to the first movable contact wheel.
[0010] This utility model discloses a branch pipe assembly for measuring bridge deflection, comprising a vertical pipe body. During testing, the pipe body is filled with liquid (such as water), and a float structure is arranged inside the pipe body. During the test, the float rises and falls synchronously with the pipe body as the liquid level changes (relative to the pipe body). The rise and fall of the float is transmitted to the outside of the pipe body through a sliding rod fixed to the float. The outer end of the sliding rod acts as a moving contact of a rheostat, sliding on the rheostat. Thus, the displacement of the sliding rod can be deduced from the change in the resistance value of the rheostat, thereby determining the liquid level change and thus the deflection at the test point.
[0011] This utility model also provides a bridge deflection measuring device using the above-mentioned branch pipe assembly for bridge deflection measurement. Specifically, the bridge deflection measuring device includes:
[0012] - Multiple branch pipe assemblies for bridge deflection measurement as described above;
[0013] - Liquid supply tank;
[0014] - The liquid supply pipe and the liquid supply tank are connected to the pipe body of the multiple bridge deflection measurement branch pipe assemblies as described above through the liquid supply pipe and the liquid inlet pipe of the multiple bridge deflection measurement branch pipe assemblies as described above.
[0015] - An information acquisition and processing device, electrically connected to a guide sleeve, a first terminal and a second terminal, is used to detect the resistance between the first movable contact wheel and the first terminal and / or between the second movable contact wheel and the second terminal.
[0016] This utility model discloses a deflection measuring device that connects multiple branch pipe assemblies for bridge deflection measurement in parallel to a liquid supply pipe. The liquid supply pipe is connected to a liquid supply tank, forming a connecting pipe with the supply tank and multiple branch pipe assemblies, ensuring that the liquid supply tank and multiple branch pipe assemblies always maintain the same liquid level. Simultaneously with laying the liquid supply pipe, a detection line can be laid. Each branch pipe assembly's rheostat and an information acquisition and processing device are electrically connected to both sides of the detection line. The information acquisition and processing device can acquire the resistance value of the rheostat associated with each branch pipe assembly in real time. In a preferred embodiment, the liquid supply tank has a cross-sectional area much larger than the sum of the cross-sectional areas of all the pipe bodies, so that changes in the liquid level of the branch pipe assemblies relative to the pipe bodies do not significantly affect the liquid level change in the liquid supply tank. Furthermore, the liquid supply tank is placed at a reference position, typically located at both ends of the bridge under test or even outside the bridge itself. Therefore, deformation of the bridge under load does not affect the horizontal position of the liquid supply tank, and the changes in the liquid level within the pipe bodies of each branch pipe assembly correspond to the bridge's deflection.
[0017] This utility model discloses a branch pipe assembly and measuring device for measuring bridge deflection. It only requires a rheostat structure to be installed in the branch pipe section at each test point, converting the liquid level change relative to the pipe body into a change in the resistance value of the rheostat, thereby obtaining the corresponding deflection at the test point. It is suitable for temporary engineering inspections and also applicable to long-term bridge monitoring. The rheostat structure and corresponding resistance detection equipment do not significantly increase material costs, while reducing the need for manual labor. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the first embodiment of the branch pipe assembly for measuring bridge deflection according to this utility model.
[0019] Figure 2 This is a schematic diagram of the second embodiment of the branch pipe assembly for measuring bridge deflection according to this utility model.
[0020] Figure 3 A side view of the moving contact wheel.
[0021] Figure 4 Schematic diagram of the fit between the guide sleeve and the metal slide rod
[0022] Figure 5 Schematic diagram of a bridge deflection measuring device Detailed Implementation
[0023] The present invention will be further described in detail below with reference to embodiments:
[0024] See Figure 1 , Figure 2 This utility model provides a branch pipe assembly 10 for measuring bridge deflection, including a connecting pipe assembly, a frame assembly, a guide assembly, a follower assembly, and a resistor assembly.
[0025] The connecting pipe assembly includes a vertical pipe body 110, a liquid inlet pipe 112 at the lower part of the pipe body, and an atmospheric connecting pipe 113 at the upper part of the pipe body. An end cap 111 is provided at the upper end of the pipe body. The pipe body 110 is used to contain liquid, which can be tap water or tap water with added colorant. The liquid inlet pipe 112 is used to connect to the supply tank 20 (described below) to fill the pipe body 110 with liquid. The atmospheric connecting pipe 113 keeps the liquid level inside the pipe body 110 at atmospheric pressure. The end cap 111 is used to support the frame assembly (described below), and particularly, the branch pipe assembly 10 of this invention is used to prevent dust and other contaminants from falling into the pipe body during long-term monitoring.
[0026] - A frame assembly, placed on end cap 111, includes a vertical segment 120 fixed to end cap 111 and a longitudinal segment 122 extending laterally from the upper end of vertical segment 120. Vertical segment 120 is used to support longitudinal segment 122.
[0027] - The guide assembly includes a guide sleeve 150 and a guide sleeve fixing member 151. The guide sleeve 150 is vertically arranged and passes through the end cap 111. The guide sleeve 150 is fixed relative to the tube body 110 by the guide sleeve fixing member 151. The guide sleeve 150 is a good conductor. It can be understood that the guide sleeve 150 has a generally columnar structure with a through hole at its axis X, thereby facilitating the insertion of the metal slide rod 131 described below and guiding the metal slide rod 131 along the axial through hole of the guide sleeve 150.
[0028] - The follow-up assembly includes a float 130, a metal slide bar 131, a metal crossbar 132, and a first movable contact wheel 133. The float 130 is placed inside the tube body 110, and the metal slide bar 131 is placed coaxially within the guide sleeve 150 and can slide freely vertically along the axis X within the guide sleeve 150. The lower end of the metal slide bar 131 is connected to the float 130, and the upper end of the metal slide bar 131 is fixed to the metal crossbar 132. The lateral end of the metal crossbar 132 is provided with a rotatable first movable contact wheel 133. Therefore, in response to changes in the liquid level inside the tube body 110, the float 130, the metal slide bar 131, the metal crossbar 132, and the first movable contact wheel 133 will move up and down relative to the tube body 110. The metal slide bar 131, the metal crossbar 132, and the first movable contact wheel 133 are electrically connected. The metal slide bar 131 is guided along the axial through hole of the guide sleeve 150. Since the guide sleeve 150 is a good conductor, it is also electrically connected to the movable contact wheel 133. In a preferred embodiment, the guide sleeve 150 is made of graphite. Graphite has excellent electrical conductivity and high lubricity, which greatly reduces the sliding resistance of the metal slide bar 131 within the guide sleeve 150.
[0029] - A resistor assembly, including a first elastic element 140, a first resistance wire 141, a first terminal 142, and a first anchor point 143, wherein the first elastic element 140, the first resistance wire 141, the first terminal 142, and the first anchor point 143 are located in the same vertical plane. For example... Figure 1 In the embodiment shown, the first terminal 142 and the first anchor point 143 are respectively fixedly arranged on the end cap 111 and the longitudinal section 122; or as shown in the figure. Figure 2 In the illustrated embodiment, the first terminal 142 and the first anchor point 143 are fixedly arranged on the longitudinal section 122 and the end cap 111, respectively. The first end of the first elastic element 140 is connected to the first end of the first resistance wire 141, the second end of the first resistance wire 141 is fixedly and electrically connected to the first terminal 142, and the second end of the first elastic element 140 is fixedly connected to the first anchor point 143. Since the first elastic element 140, the first resistance wire 141, the first terminal 142, and the first anchor point 143 are in the same vertical plane, and the fixed connection between the resistance wire 141 and the two ends of the elastic element 140 is arranged such that the elastic element 140 is in a stretched state, the resistance wire 141 can always abut against and be electrically connected to the first movable contact wheel 133 during the vertical sliding of the first movable contact wheel 133 with the metal slide rod 131.
[0030] The aforementioned follower component and resistor component essentially constitute a rheostat structure. When the liquid level inside the tube body 110 rises, the float 130, metal slide bar 131, metal crossbar 132, and first moving contact wheel 133 will rise relative to the tube body 110, as shown below. Figure 1 In the illustrated embodiment, the length of the first resistance wire 141 located between the first movable contact wheel 133 and the first terminal 142 will increase, meaning that the resistance value will increase when collecting the resistance signal between the guide sleeve 150 and the first terminal 142. Conversely, when the liquid level in the tube body 110 decreases, the resistance value will decrease when collecting the resistance signal between the guide sleeve 150 and the first terminal 142. Figure 1 The illustrated embodiment is exactly the opposite. When the liquid level inside the tube body 110 rises, the resistance value decreases when the resistance signal between the guide sleeve 150 and the first terminal 142 is collected; conversely, when the liquid level inside the tube body 110 falls, the resistance value increases when the resistance signal between the guide sleeve 150 and the first terminal 142 is collected. It can be understood that regardless of... Figure 1 The above-described embodiments, or Figure 2 In the above-described embodiment, if a corresponding resistance change is detected, a technician can determine the liquid level change within the tube body 110 accordingly.
[0031] In another embodiment: it also includes a symmetrical structure with respect to the axis X of the metal slide bar (131).
[0032] -The second movable contact wheel 133' opposite to the first movable contact wheel 133; and
[0033] - A second elastic element 140', a second resistance wire 141', a second terminal 142', and a second anchor point 143' that are respectively opposite to the first elastic element 140, the first resistance wire 141, the first terminal 142, and the first anchor point 143.
[0034] It is understandable that, such as Figure 1 , 2 As shown, symmetrically arranging a pair of rheostats has the following advantages: for example, one rheostat can be used as a backup; two resistance changes can be used to calculate two liquid level changes, and the average of the two values is more accurate; if there is a significant difference between the two liquid level test data, it indicates that maintenance may be necessary; more importantly, symmetrically arranging a pair of rheostats can relatively offset the force on the follower component, making the sliding of the metal slide rod 131 within the guide sleeve 150 smoother and reducing test errors.
[0035] In another embodiment: the line connecting the outermost edge of the first movable contact wheel 133 relative to the axis X of the metal slide rod 131 and the first terminal 142 is parallel to the axis X of the metal slide rod 131, and the first anchor point 143 is closer to the axis X of the metal slide rod 131 than the first terminal 142. That is, through the above structural design, the segment of the first resistance wire 141 between the first movable contact wheel 133 and the first terminal 142 is in a vertical state, so the change in liquid level in the tube body 110 is directly equal to the change in length of the segment of the first resistance wire 141 between the first movable contact wheel 133 and the first terminal 142. The first anchor point 143 is offset towards the axis, and under the tensile and springback action of the first elastic element 140, the first movable contact wheel 133 can always form good contact with the first resistance wire 141.
[0036] In another embodiment, such as Figure 3 As shown, the first movable contact wheel 133 and / or the second movable contact wheel 133' have V-shaped grooves on the sides facing the first resistance wire 141 and / or the second resistance wire 141', thereby preventing the first resistance wire 141 and / or the second resistance wire 141' from sliding out of the first movable contact wheel 133 and / or the second movable contact wheel 133'.
[0037] In another embodiment, such as Figure 4 As shown, the metal slide rod 131 and the guide sleeve 150 have a coupled anti-rotation structure, meaning that the metal slide rod 131 and the guide sleeve 150 can only slide relative to each other along the axis X, and cannot rotate relative to each other around the axis X. This also improves the reliability of the electrical contact between the first resistance wire 141 and / or the second resistance wire 141' and the first moving contact wheel 133 and / or the second moving contact wheel 133'.
[0038] This utility model also provides a bridge deflection measuring device, such as Figure 5 As shown, the device includes
[0039] - Multiple branch pipe assemblies 10 for measuring bridge deflection according to any of the above embodiments;
[0040] - Liquid supply tank 20;
[0041] - The liquid supply pipe 30 and the liquid supply tank 20 are connected to the pipe body 110 of the measuring branch pipe assembly 10 through the liquid supply pipe 30 and the liquid inlet pipe 112 of the measuring branch pipe assembly 10, respectively.
[0042] - Information acquisition and processing device 40, which is electrically connected to guide sleeve 150, first terminal 142 and second terminal 142', is used to detect the resistance between the first movable contact wheel 133 and the first terminal 142 and / or between the second movable contact wheel 133' and the second terminal 142'.
[0043] In actual use, multiple branch pipe assemblies 10 are respectively laid out at the test points. The liquid level in the liquid supply tank 20 is always at atmospheric pressure. Preferably, it is placed in the external area of the bridge to be tested. In this way, the deformation of the liquid supply tank 20 after the bridge is loaded will not affect the horizontal position of the liquid supply tank, which can serve as a reference point. In addition, during the liquid level laying process in 110, electrical wires can be laid simultaneously to electrically connect the information acquisition and processing device 40 with the guide sleeve 150, the first terminal 142, and the second terminal 142'. Both dynamic and static load tests can remotely monitor the resistance value change of the first resistance wire 141 between the first moving contact wheel 133 and the first terminal 142 in each branch pipe assembly 10, and / or the resistance value change of the second resistance wire 141' between the second moving contact wheel 133' and the second terminal 142', thereby determining the deflection value of each test point.
[0044] In a further preferred embodiment, the sum of the cross-sectional areas of the pipe bodies 110 of all the branch pipe assemblies 10 used for bridge deflection measurement is S1, and the cross-sectional area of the liquid supply tank 20 is S2, where S2 is at least 50 times S1, for example, 100 times. Even if the average liquid level in all pipe bodies 110 rises by 100 mm, the liquid level change in the liquid supply tank 20 due to the connecting pipes will only decrease by about 1 mm. Therefore, this decrease in liquid level is ignored, and the liquid level change in each pipe body 110 is equivalent to the deflection at its corresponding test point, greatly simplifying the subsequent calculations.
[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A branch pipe assembly (10) for measuring bridge deflection, characterized in that... include: - The connecting pipe assembly includes a vertical pipe body (110), an inlet pipe (112) at the bottom of the pipe body (110), and an atmospheric connecting pipe (113) at the top of the pipe body (110). An end cap (111) is provided at the top of the pipe body (110). - A frame assembly, placed on the end cap (111), includes a vertical section (120) fixed to the end cap (111) and a longitudinal section (122) extending laterally from the upper end of the vertical section (120); -Guide assembly, including guide sleeve (150) and guide sleeve fixing member (151), guide sleeve (150) is vertically arranged and passes through end cap (111), guide sleeve (150) is fixed to tube body (110) by guide sleeve fixing member (151), guide sleeve (150) is a good conductor; - The follower assembly includes a float (130), a metal slide bar (131), a metal crossbar (132), and a first movable contact wheel (133). The float (130) is placed inside the tube body (110). The metal slide bar (131) is vertically slidable and coaxially (X) placed inside the guide sleeve (150). The lower end of the metal slide bar (131) is connected to the float (130), and the upper end of the metal slide bar (131) is fixed to the metal crossbar (132). The lateral end of the metal crossbar (132) is provided with a rotatable first movable contact wheel (133). The metal slide bar (131), the metal crossbar (132), and the first movable contact wheel (133) are electrically connected. - A resistor assembly includes a first elastic element (140), a first resistance wire (141), a first terminal (142), and a first anchor point (143) all in the same vertical plane. The first terminal (142) and the first anchor point (143) are respectively fixedly arranged on the end cap (111) and the longitudinal section (122), or the first terminal (142) and the first anchor point (143) are respectively fixedly arranged on the longitudinal section (122) and the end cap (111). The first elastic element (140) The first end of the first resistor (141) is connected to the first end of the first resistor (141). The second end of the first resistor (141) is fixed and electrically connected to the first terminal (142). The second end of the first elastic element (140) is fixed to the first anchor point (143). During the vertical sliding of the first movable contact wheel (133) with the metal slide rod (131), the first elastic element (140) is in a stretched state, which causes the first resistor (141) to always abut against and be electrically connected to the first movable contact wheel (133).
2. The branch pipe assembly (10) for bridge deflection measurement according to claim 1, characterized in that: The guide sleeve (150) is made of graphite.
3. The branch pipe assembly (10) for bridge deflection measurement according to claim 1, characterized in that: The metal slide bar (131) and the guide sleeve (150) can only slide relative to each other along the axis (X), and cannot rotate relative to each other around the axis (X).
4. The branch pipe assembly (10) for bridge deflection measurement according to claim 1, characterized in that: The first moving contact wheel (133) has a V-shaped groove on the side facing the first resistance wire (141).
5. The branch pipe assembly (10) for bridge deflection measurement according to any one of claims 1-4, characterized in that: It also includes a second movable contact wheel (133') that is symmetrical about the axis of the metal slide bar (131) and is opposite to the first movable contact wheel (133); - A second elastic element (140'), a second resistance wire (141'), a second terminal (142'), and a second anchor point (143') that are respectively opposite to the first elastic element (140), the first resistance wire (141), the first terminal (142), and the first anchor point (143).
6. The branch pipe assembly (10) for bridge deflection measurement according to claim 5, characterized in that: The line connecting the outermost edge of the first movable contact wheel (133) relative to the axis (X) of the metal slide bar (131) and the first terminal (142) is parallel to the axis (X) of the metal slide bar (131). The first anchor point (143) is closer to the axis (X) of the metal slide bar (131) than the first terminal (142).
7. A bridge deflection measuring device, characterized in that: include - Multiple branch pipe assemblies (10) for measuring bridge deflection according to any one of claims 5-6; - Liquid supply tank (20); - The liquid supply pipe (30) and the liquid supply tank (20) are connected to the pipe body (110) of the multiple branch pipe assemblies (10) for measuring bridge deflection according to any one of claims 5-6 through the liquid supply pipe (30) and the liquid inlet pipe (112) of the multiple branch pipe assemblies (10) for measuring bridge deflection according to any one of claims 5-6 respectively. - An information acquisition and processing device (40) is electrically connected to a guide sleeve (150), a first terminal (142) and a second terminal (142'), and is used to detect the resistance between the first movable contact wheel (133) and the first terminal (142) and / or between the second movable contact wheel (133') and the second terminal (142').
8. The bridge deflection measuring device according to claim 7, characterized in that: The sum of the cross-sectional areas of the pipe bodies (110) of the multiple branch pipe assemblies (10) for measuring bridge deflection according to any one of claims 5-6 is S1, and the cross-sectional area of the liquid supply tank (20) is S2, wherein S2 is at least 50 times S1.