Full section size measuring instrument for concrete precast T beam

Abstract

The utility model relates to bridge construction detection technical field, more particularly, relate to a kind of full section size measuring instrument of concrete prefabricated T beam, the device is fixed in the bottom of T beam by the clamping assembly of micro-adjusting screw and level bubble and establishes accurate horizontal datum.Scan component is constituted by driving motor, screw rod, guide rod and slider, driving laser range finder carries out stable, accurate vertical reciprocating movement along support arm.Two sides data of T beam can be measured respectively by rotating support arm, combined with horizontal movement, system obtains profile position information.Based on measurement data, T beam web thickness is calculated by two sides ranging value and structure constant, and T beam height is determined by the coordinate difference of laser range finder in vertical direction.The scheme realizes fast, accurate automation measurement, effectively improves the efficiency and reliability of T beam quality control.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction inspection technology, and more specifically, to a full-section dimension measuring instrument for precast concrete T-beams. Background Technology

[0002] Precast concrete T-beams are reinforced concrete or prestressed concrete beams prefabricated in a factory or on-site. They are the main load-bearing structure of bridges. A precast concrete T-beam consists of a web, flanges, and a horseshoe-shaped section. The flanges are part of the main beam and also form the bridge deck, bearing the loads of vehicles and pedestrians. Precast concrete T-beams have a clearly defined stress distribution, fully utilizing the compressive strength of concrete and the tensile strength of steel reinforcement. They are relatively easy to construct and are the most widely used bridge type in medium- and small-span beam bridges.

[0003] Precast concrete T-beams are a type of bridge structure where the bridge span is divided into several strips (or blocks) for prefabrication. These strips (or blocks) are then assembled into a complete bridge structure during installation. This allows for factory-based, standardized construction, ensuring high-quality construction. However, during construction, it is necessary to test the cross-sectional dimensions of the precast concrete T-beams. Traditional measuring tools (such as straightedges and calipers) are difficult to place and accurately measure in these areas, and the measuring personnel's arms and line of sight are often obstructed, making it impossible to directly and vertically contact the surface to be measured, thus making it difficult to obtain accurate data. Although testing the cross-sectional dimensions of precast concrete T-beams is a fundamental task, the complex structure and large size of the beams themselves lead to a series of technical problems, including limited measurement space, inconvenient on-site operation, and a significant trade-off between accuracy and efficiency. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a full-section dimension measuring instrument for precast concrete T-beams, aiming to provide a measuring instrument with high measurement accuracy and convenient testing.

[0005] A full-section dimension measuring instrument for precast concrete T-beams according to an embodiment of the present invention includes: A horizontal frame, with snap-fit ​​components at both ends; A reference plate is provided, and the reference plate and the horizontal frame are slidably connected in the horizontal direction; the reference plate is provided with a first limiting hole and a second limiting hole. The ranging mechanism includes a support arm that is rotatably connected to the reference plate. The support arm has a positioning pin that can be inserted into the first limiting hole or the second limiting hole when the support arm rotates. The support arm also has a scanning component in the vertical direction, which includes a laser rangefinder that can reciprocate in the vertical direction.

[0006] According to some embodiments of the present invention, the snap-fit ​​assembly includes a crossbeam, a top rod, and a knob; a snap-fit ​​part is provided on one side of the crossbeam, and an abutment part is provided on the other side of the crossbeam; the top rod and the abutment part are threadedly connected, and the knob and the top rod are fixedly connected.

[0007] According to some embodiments of the present invention, the snap-fit ​​assembly includes a plurality of fine-tuning screws, and the fine-tuning screws are threadedly connected to the crossbeam.

[0008] According to some embodiments of the present invention, the crossbeam is provided with a slot, and the horizontal frame is provided with at least one support beam, the end of which is engaged in the slot.

[0009] According to some embodiments of this utility model, a horizontal bubble is provided on the crossbeam.

[0010] According to some embodiments of this utility model, a guide rail is provided on the support beam, and a linear bearing is provided on the reference plate, wherein the linear bearing and the guide rail are slidably connected.

[0011] According to some embodiments of this utility model, the scanning assembly includes a drive motor, a lead screw, a guide rod, a slider, and a sleeve. The drive motor is fixedly connected to the support arm, and the output end of the drive motor is drivenly connected to the lead screw. The lead screw is rotatably connected to the drive arm, the sleeve is threadedly connected to the lead screw, and the sleeve is fixedly connected to the slider. The guide rod is fixedly connected to the support arm, and the slider is slidably connected to the guide rail. The slider is fixedly connected to the laser rangefinder.

[0012] According to some embodiments of this utility model, two guide rods are provided, and the two guide rods are respectively located on both sides of the lead screw.

[0013] According to some embodiments of the present invention, the drive motor and the lead screw are connected by a coupling.

[0014] According to some embodiments of the present invention, the lead screw is rotatably connected to the support arm via an angular contact bearing.

[0015] A full-section dimension measuring instrument for precast concrete T-beams according to an embodiment of the present invention has at least the following beneficial effects: According to the present invention, the snap-fit ​​assembly is designed to be fixed to the bottom of the T-beam, avoiding operation in the narrow and complex area of ​​the T-beam web. The ranging mechanism can quickly switch the measuring side by rotating the support arm, solving the problem of reinstalling or positioning the measuring tool in a narrow space.

[0016] According to the present invention, once installation is completed via the snap-fit ​​assembly, a stable and reliable measurement benchmark can be established. Surveyors no longer need to frequently move or climb to find the benchmark, reducing the risks and labor intensity of working at heights. The sliding connection between the benchmark plate and the horizontal frame, and the movement of the laser rangefinder along the support arm, together enable rapid and flexible positioning of the measurement point.

[0017] According to the present invention, using a reference plate as a unified horizontal benchmark effectively eliminates accumulated errors. The laser rangefinder performs non-contact measurement, reducing errors caused by human readings and tool contact. The thickness of the T-beam web is directly calculated by acquiring data from both sides, a scientific method that yields more objective and accurate results. The entire measurement process is highly dependent on the benchmark, less affected by environmental and human interference, and exhibits good data repeatability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an assembly structure of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a three-dimensional structural schematic diagram of the present invention from another perspective; Figure 4 This is a schematic diagram of a snap-fit ​​assembly of the present invention; Figure 5 This is a schematic diagram of the distance measuring mechanism of this utility model.

[0019] In the picture: 100-Horizontal frame, 110-Support beam, 120-Snap-fit ​​assembly, 121-Crossbeam, 122-Snap-fit ​​part, 123-Abutting part, 124-Top rod, 125-Knob, 126-Fine adjustment screw, 127-Slot, 130-Level bubble, 140-Guide rail; 200 - Reference plate, 201 - First limiting hole, 202 - Second limiting hole, 210 - Linear bearing; 300-Distance measuring mechanism, 310-Support arm, 311-Positioning pin, 320-Scanning component, 321-Laser rangefinder, 322-Drive motor, 323-Lead screw, 324-Guide rod, 325-Slider, 326-Sleeve, 327-Coupling; 400-T beam. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. 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.

[0022] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figures 1 to 5As shown, this utility model discloses a full-section dimension measuring instrument for precast concrete T-beams, comprising a horizontal frame 100, a reference plate 200, and a distance measuring mechanism 300. The horizontal frame 100, the reference plate 200, and the distance measuring mechanism 300 are all detachable, allowing for rapid assembly and disassembly through the design of this structure. In this embodiment, the horizontal frame 100 is provided with snap-fit ​​components 120 at both ends; the snap-fit ​​components 120 are used to fix the device on the bottom of the T-beam 400, and the reference plate 200 and the horizontal frame 100 are slidably connected in the horizontal direction; the reference plate 200 serves as the horizontal reference of the ranging mechanism 300, and the horizontal position of the ranging mechanism 300 can be adjusted by moving the reference plate 200, and the ranging mechanism 300 can be controlled to move to the automatic position. The reference plate 200 is provided with a first limiting hole 201 and a second limiting hole 202; the ranging mechanism 300 is provided with a support arm 310, which is rotatably connected to the reference plate 200, and a positioning pin 311 is provided on the support arm 310. When the support arm 310 rotates, the positioning pin 311 can be inserted into the first limiting hole 201 or the second limiting hole 202 respectively; when one side of the T-beam 400 is tested, the limiting pin is removed, and the ranging mechanism 300 is rotated to the other side of the T-beam 400 for measurement. The support arm 310 is vertically equipped with a scanning component 320, which includes a laser rangefinder 321 capable of reciprocating vertically. The laser rangefinder 321 acquires position data from one side of the T-beam 400, and by testing the other side, it acquires position data for that side as well. Calculations based on these position data from both sides yield the thickness data of the T-beam 400. Simultaneously, by moving the laser rangefinder 321 horizontally, it acquires the height data of the T-beam 400.

[0025] Specifically, in this embodiment, firstly, the entire device is securely fixed to the bottom of the T-beam 400 via the snap-fit ​​components 120 at both ends of the horizontal frame 100. This operation establishes the reference for the device installation. Secondly, the reference plate 200 serves as the horizontal reference for the ranging mechanism 300, and it is slidably connected to the horizontal frame 100 in the horizontal direction. By moving the reference plate 200, the horizontal position of the ranging mechanism 300 supported on it can be adjusted so that it can be aligned with a specific point in the area to be measured on the T-beam 400. The core component of the ranging mechanism 300 is the laser rangefinder 321, which is mounted on the support arm 310. The support arm 310 is rotatably connected to the reference plate 200 and is equipped with a positioning pin 311. When it is necessary to measure one side of the T-beam 400, the support arm 310 is rotated so that the positioning pin 311 is inserted into the first limiting hole 201, thereby fixing the ranging mechanism 300 in its working posture on that side. After completing the measurement on one side, the positioning pin 311 can be removed, the support arm 310 rotated to the other side of the T-beam 400, and the positioning pin 311 inserted into the second limiting hole 202 to fix the posture, and the measurement can continue. During the specific measurement process, the laser rangefinder 321 can reciprocate along the support arm 310 in the vertical direction. Through this movement, combined with the horizontal movement of the reference plate 200, the laser rangefinder 321 can systematically scan the contour of one side of the T-beam 400 and obtain a series of position data. After obtaining the position data of both sides of the T-beam 400, the thickness data of the T-beam 400 at the specified position can be obtained by calculating these data. At the same time, the vertical movement trajectory of the laser rangefinder 321 itself also directly reflects the T-beam height data of the T-beam 400. Through the design of this structure, the snap-fit ​​component 120 is designed to be fixed to the bottom of the T-beam, avoiding operation in the narrow and complex area of ​​the web of the T-beam 400. The ranging mechanism 300 can quickly switch the measuring side by rotating the support arm 310, solving the problem of reinstalling or positioning measuring tools in confined spaces. Once installed via the snap-fit ​​assembly 120, a stable and reliable measuring benchmark can be established. Surveyors no longer need to frequently move or climb to find the measuring benchmark, reducing the risks and labor intensity of working at heights. The sliding connection between the benchmark plate 200 and the horizontal frame 100, and the movement of the laser rangefinder 321 along the support arm 310, together enable rapid and flexible positioning of the measuring point. Using the benchmark plate 200 as a unified horizontal benchmark effectively eliminates accumulated errors. The laser rangefinder 321 performs non-contact measurement, reducing errors caused by human reading and tool contact. Thickness is directly calculated by acquiring data from both sides, a scientific method that yields more objective and accurate results. The entire measurement process is highly dependent on the benchmark, less affected by environmental and human interference, and has good data repeatability.

[0026] Specifically, in this embodiment, the thickness T of the T-beam at a specific T-beam height is determined by the data D1 and D2 measured by the laser rangefinder 321 on both sides, and the horizontal displacement L of the reference plate 200. The calculation formula is as follows: T=2*L-D1-D2 D1 is the distance measured by the laser rangefinder 321 from the reference position of the scanning component 320 to the surface of the web of the T-beam on that side.

[0027] D2 is the distance measured by the laser rangefinder 321 from the reference position of the scanning component 320 to the surface of the web of the T-beam on that side.

[0028] L is the structural constant of the device, representing the inherent distance between the rotation center axis of the ranging mechanism 300 and the reference surface of the reference plate 200.

[0029] In some embodiments of this utility model, the snap-fit ​​assembly 120 includes a crossbeam 121, a push rod 124, and a knob 125. A snap-fit ​​portion 122 is provided on one side of the crossbeam 121, and an abutment portion 123 is provided on the other side. The push rod 124 and the abutment portion 123 are threadedly connected, and the knob 125 is fixedly connected to the push rod 124. Specifically, in this embodiment, the snap-fit ​​assembly 120 achieves device fixation through the synergistic action of the crossbeam 121, the push rod 124, and the knob 125. The snap-fit ​​portion 122 on one side of the crossbeam 121 first hooks onto one edge of the bottom of the T-beam 400T. Rotating the knob 125 drives the push rod 124, which is fixed thereto, to rotate. Since the push rod 124 is threadedly connected to the abutment portion 123 on the other side of the crossbeam 121, the rotation of the push rod 124 is converted into linear motion relative to the abutment portion 123. The end of the linearly moving push rod 124 eventually abuts tightly against the other edge of the bottom of the T-beam, thus forming a clamping force together with the locking part 122, firmly locking the entire horizontal frame 100 onto the bottom of the T-beam. Through this structural design, the locking assembly 120 achieves quick and reliable installation and removal. The knob 125 provides a manual operation interface, allowing sufficient clamping force to be applied without additional tools. The threaded drive between the push rod 124 and the abutment part 123 generates significant mechanical gain, ensuring a firm and stable abutment between the push rod 124 and the locking part 122 against both sides of the bottom of the T-beam, effectively preventing slippage or loosening of the device during measurement. This design simplifies the benchmark establishment process and provides a solid foundation for subsequent accurate measurements. Furthermore, locking anti-slip mechanisms, such as elastic washers and check springs, can be incorporated to prevent the push rod 124 from rotating.

[0030] In some embodiments of this utility model, the snap-fit ​​assembly 120 includes multiple fine-tuning screws 126, which are threadedly connected to the crossbeam 121. One end of the fine-tuning screw 126 passes through the crossbeam 121 and abuts against the bottom surface of the T-beam. The fine-tuning screw 126 can maintain the surface of the reference plate 200 level. Furthermore, a spirit level 130 is provided on the crossbeam 121. The snap-fit ​​assembly 120 improves the accuracy of reference establishment by adding the fine-tuning screws 126 and the spirit level 130. The multiple fine-tuning screws 126 are threadedly connected to the crossbeam 121. Rotating the fine-tuning screw 126 allows one end to pass through the crossbeam 121 and abut against the bottom surface of the T-beam. By adjusting the extension length of each fine-tuning screw 126, the spatial orientation of the crossbeam 121 relative to the bottom surface of the T-beam can be precisely adjusted. A level bubble 130 on the crossbeam 121 provides visual feedback on the horizontal status. The operator adjusts the fine-tuning screw 126 based on this feedback until the level bubble 130 indicates that the crossbeam 121 is horizontal, thus ensuring that the surface of the reference plate 200 associated with the crossbeam 121 is horizontal. This design achieves precise leveling of the device's reference plane through the fine-tuning screw 126. The level bubble 130 provides a clear and reliable level indication, giving the leveling operation a clear basis. The independent adjustment of multiple fine-tuning screws 126 can compensate for minor unevenness that may exist on the bottom surface of the T-beam, effectively eliminating reference errors introduced by uneven mounting surfaces or poor initial engagement posture. This improvement significantly enhances the accuracy of the reference plate 200 as a horizontal reference for measurement, ensuring the accuracy of all subsequent distance measurement data from the outset.

[0031] In some embodiments of this utility model, the crossbeam 121 is provided with a slot 127, and the horizontal frame 100 is provided with at least one support beam 110, the end of which is engaged in the slot 127. In this embodiment, the support beam 110 is made of lightweight alloy. Specifically, the horizontal frame 100 can be composed of aluminum alloy profiles spliced ​​together. In this embodiment, the splicing method allows for quick assembly.

[0032] In some embodiments of this utility model, a guide rail 140 is provided on the support beam 110, and a linear bearing 210 is provided on the reference plate 200. The linear bearing 210 and the guide rail 140 are slidably connected. By setting the structure of the linear bearing 210 and the guide rail 140, it is convenient to adjust the operating area of ​​the reference plate 200.

[0033] In some embodiments of this utility model, the scanning component 320 includes a drive motor 322, a lead screw 323, a guide rod 324, a slider 325, and a sleeve 326. The drive motor 322 is fixedly connected to the support arm 310, and the output end of the drive motor 322 is drivenly connected to the lead screw 323. The lead screw 323 is rotatably connected to the drive arm, the sleeve 326 is threadedly connected to the lead screw 323, and the sleeve 326 is fixedly connected to the slider 325. The guide rod 324 is fixedly connected to the support arm 310, and the slider 325 is slidably connected to the guide rail 140. The slider 325 is fixedly connected to the laser rangefinder 321. Specifically, in this embodiment, the drive motor 322 is fixedly connected to the support arm 310, providing initial power. The output end of the drive motor 322 is drivenly connected to the lead screw 323, driving the lead screw 323 to rotate around its axis. The lead screw 323 and the support arm 310 form a rotatable connection. The sleeve 326 and the lead screw 323 are threaded together, thus converting the rotational motion of the lead screw 323 into the linear motion of the sleeve 326. The sleeve 326 is fixedly connected to the slider 325, the guide rod 324 is fixedly connected to the support arm 310, and the slider 325 and the guide rod 324 form a sliding connection. This design allows the linear motion of the sleeve 326 to be transmitted to the slider 325, forcing the slider 325 to make stable translations along the axial direction of the guide rod 324, i.e., the vertical direction. The laser rangefinder 321, fixed on the slider 325, then performs precise vertical reciprocating motion. The structure of this scanning assembly 320 ensures the accuracy and reliability of the laser rangefinder 321's movement trajectory. The lead screw 323 transmission mechanism converts the rotational motion of the motor into linear motion and has a self-locking characteristic, which prevents the slider 325 from slipping at any position, thereby ensuring positioning accuracy. The sliding connection between guide rod 324 and slider 325 provides solid guidance and support for the entire motion system, effectively suppressing swaying and wobbling during movement and ensuring the stability of the laser rangefinder 321's posture during scanning. By collecting the output data of drive motor 322, the moving distance of laser rangefinder 321 can be obtained, thereby acquiring the T-beam height data of T-beam 400. Specifically, the T-beam height H refers to the vertical height of the T-beam from its bottom to the top surface of the flange. Its calculation formula is: H =|H1-H2| The formula calculates the absolute vertical height difference between two measuring points on the beam bottom and the flange top of the laser rangefinder 321. Since the laser rangefinder 321 moves vertically along the guide rod 324, its trajectory is vertical; therefore, the absolute value of the difference between H1 and H2 is the T-beam height H of the flange. The drive motor 322 and the lead screw 323 and guide rod 324 mechanism ensure the straightness and accuracy of the measurement stroke, thus guaranteeing the accuracy of the T-beam height measurement.

[0034] In some embodiments of this invention, two guide rods 324 are provided, with the two guide rods 324 located on both sides of the lead screw 323. By providing two sets of guide rods 324, stable vertical guidance can be provided.

[0035] In some embodiments of this invention, the drive motor 322 and the lead screw 323 are connected by a coupling 327. The coupling 327 is designed to achieve precise transmission of the drive motor 322.

[0036] In some embodiments of this invention, the lead screw 323 is rotatably connected to the support arm 310 via an angular contact bearing. The angular contact bearing can simultaneously withstand axial and radial forces in one direction.

[0037] In some embodiments of this utility model, a control panel and a signal transmission module are also included. The control panel is equipped with a display and a control module. The control module can acquire and display data from the drive motor and the laser tester. The control module and the signal transmission module are electrically connected. The signal transmission module can transmit the acquired data to the cloud or a handheld receiving device.

[0038] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A full-section dimension measuring instrument for precast concrete T-beams, characterized in that, include: A horizontal frame (100) is provided with snap-fit ​​components (120) at both ends of the horizontal frame (100). A reference plate (200) and a horizontal frame (100) are slidably connected in the horizontal direction; the reference plate (200) is provided with a first limiting hole (201) and a second limiting hole (202); The ranging mechanism (300) is provided with a support arm (310), which is rotatably connected to the reference plate (200). The support arm (310) is provided with a positioning pin (311). When the support arm (310) rotates, the positioning pin (311) can be inserted into the first limiting hole (201) or the second limiting hole (202) respectively. The support arm (310) is provided with a scanning component (320) in the vertical direction. The scanning component (320) is provided with a laser rangefinder (321), which can reciprocate in the vertical direction.

2. The full-section dimension measuring instrument for precast concrete T-beams according to claim 1, characterized in that, The snap-fit ​​assembly (120) includes a crossbeam (121), a push rod (124), and a knob (125); a snap-fit ​​part (122) is provided on one side of the crossbeam (121), and an abutment part (123) is provided on the other side of the crossbeam (121); the push rod (124) and the abutment part (123) are threadedly connected; and the knob (125) and the push rod (124) are fixedly connected.

3. The full-section dimension measuring instrument for precast concrete T-beams according to claim 2, characterized in that, The snap-fit ​​assembly (120) includes a plurality of fine-tuning screws (126), which are threadedly connected to the crossbeam (121).

4. The full-section dimension measuring instrument for precast concrete T-beams according to claim 3, characterized in that, The crossbeam (121) is provided with a slot (127), and the horizontal frame (100) is provided with at least one support beam (110), the end of the support beam (110) being engaged in the slot (127).

5. The full-section dimension measuring instrument for precast concrete T-beams according to claim 4, characterized in that, A horizontal bubble (130) is provided on the crossbeam (121).

6. The full-section dimension measuring instrument for precast concrete T-beams according to claim 5, characterized in that, The support beam (110) is provided with a guide rail (140), and the reference plate (200) is provided with a linear bearing (210). The linear bearing (210) and the guide rail (140) are slidably connected.

7. The full-section dimension measuring instrument for precast concrete T-beams according to claim 6, characterized in that, The scanning assembly (320) includes a drive motor (322), a lead screw (323), a guide rod (324), a slider (325), and a sleeve (326). The drive motor (322) is fixedly connected to the support arm (310), and the output end of the drive motor (322) is drivenly connected to the lead screw (323). The lead screw (323) is rotatably connected to the drive arm, and the sleeve (326) is threadedly connected to the lead screw (323). The sleeve (326) is fixedly connected to the slider (325). The guide rod (324) is fixedly connected to the support arm (310), and the slider (325) is slidably connected to the guide rail (140). The slider (325) is fixedly connected to the laser rangefinder (321).

8. The full-section dimension measuring instrument for precast concrete T-beams according to claim 7, characterized in that, There are two guide rods (324), which are located on both sides of the lead screw (323).

9. The full-section dimension measuring instrument for precast concrete T-beams according to claim 7, characterized in that, The drive motor (322) and the lead screw (323) are connected by a coupling (327).

10. The full-section dimension measuring instrument for precast concrete T-beams according to claim 7, characterized in that, The lead screw (323) is rotatably connected to the support arm (310) via an angular contact bearing.

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