A Beckman beam deflectometer

Abstract

This utility model belongs to the field of construction testing equipment, specifically a Beckman beam deflectometer, including a rear beam, a front beam installed in the middle of the side wall of the rear beam, an end beam installed in the middle of the side wall of the front beam, a vertical rod fixed to the bottom of the end beam, hinge plates hinged to both sides of the rear beam, a support beam fixed to the bottom of the hinge plate, and support plates fixed to both sides of the support beam. During outdoor testing, lateral winds or gusts will directly act on the main beam of the Beckman beam, generating upward or downward "lifting force" or lateral "swaying displacement". This extra displacement will be misidentified as "road deflection", resulting in falsely high or low readings. By setting a first telescopic plate, a second telescopic plate, a slot, a telescopic rod, a clamp, and a windproof cover, a "local windless zone" can be formed, directly blocking the contact between the wind and the main beam, reducing the direct impact of wind on the beam and the measuring device, making the deflection reading more stable and reducing random errors.

Description

Technical Field

[0001] This utility model belongs to the field of building construction testing equipment, specifically a Beckman beam deflectometer. Background Technology

[0002] The Beckman beam deflectometer is a core testing device in the field of road engineering used to measure the bearing capacity of subgrade and pavement structures. It mainly determines whether the subgrade and pavement meet the design strength requirements by quantifying the "vertical deformation (i.e., deflection value) of the pavement under standard load". It is a key process for highway construction quality acceptance and maintenance status assessment.

[0003] The core design of the Beckman beam is based on the lever principle, achieving precise measurement by "amplifying the small deflection deformation of the road surface". Its main body consists of two steel beams connected by a fulcrum to form a "lever system". During testing, a standard axle load vehicle is parked at the test point, and the wheels apply a vertical load to the road surface, causing the road surface to deflect slightly downward. The front beam of the Beckman beam is placed outside the wheel, and the rear beam is placed in a stable area away from the load. A dial indicator is installed at the end of the rear beam. When the road surface deflects, the main beam will rotate around the rear fulcrum, and the dial indicator will display the amplified displacement value. The actual deflection value of the road surface can be calculated.

[0004] Through long-term use and observation, it was found that during road surface measurement, external wind force directly acts on the slender main beam of the Beckman beam deflectometer, causing the main beam to sway around the rear support point without road surface deflection, thus causing false displacement and resulting in deviation of the displacement dial gauge reading.

[0005] Therefore, this utility model provides a Beckman beam deflectometer. Utility Model Content

[0006] To overcome the shortcomings of existing technologies and solve at least one of the problems mentioned in the background art, a Beckman beam deflectometer is proposed.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A Beckman beam deflectometer of this utility model includes a rear beam, a front beam installed in the middle of the side wall of the rear beam, an end beam installed in the middle of the side wall of the front beam, a vertical rod fixed to the bottom of the end beam, hinge plates hinged to both sides of the rear beam, a support beam fixed to the bottom of the hinge plates, support plates fixed to both sides of the support beam, adjusting screws threaded to the middle of the side walls of the support beam and support plates, and a support rod fixed to the top of the support beam, the middle of the inner side wall of the support rod rotating. A movable rod is connected to the support beam. A support rod is slidably connected to the middle of the side wall of the movable rod. A dial indicator is installed in the middle of the side wall of the support rod. An abutment rod is installed on the top of the rear beam. The abutment rod and the dial indicator are correspondingly arranged. A windproof component is provided in the middle of the side wall of the support beam. A load-bearing component is provided at the bottom of the support beam. A detection component is provided on the top of the front beam. The windproof component includes a first telescopic plate, which is slidably connected to the inner wall of the support beam. A second telescopic plate is slidably connected to the middle of the inner side wall of the first telescopic plate. The support beam, the first telescopic plate, and the second telescopic plate are connected together. Both sides of the two telescopic plates have slots, and telescopic rods are installed in the middle of the inner sidewalls of the slots. A pair of clamps, made of deformable material, are fastened to the middle of the sidewalls of the telescopic rods. A windproof cover, with an arc-shaped structure, is fixed to the middle of the sidewalls of the clamps. During outdoor testing, lateral winds or gusts directly act on the main beam of the Beckman beam, generating upward or downward "lifting forces" or lateral "swaying displacements." This additional displacement can be misidentified as "road deflection," leading to falsely high or low readings. By setting up the first telescopic plate and the second... Telescopic plates, slots, telescopic rods, clamps, and wind shields can create "local windless zones," directly blocking the contact between the wind and the main beam, reducing the direct impact of wind on the beam and measuring devices, making the deflection readings more stable, and reducing random errors. In addition, during outdoor testing, the wind can carry sand, gravel, leaves, and other debris. If these debris adheres to the beam or the connecting rod of the Beckman beam, it can cause the beam to rotate and become stuck, the dial indicator and the connecting rod to make poor contact, or even scratch precision components. Setting up wind shields can form a physical barrier to reduce the intrusion of debris and reduce the risk of equipment failure.

[0008] Preferably, a limiting rod is fixed in the middle of the side wall of the windproof cover. The limiting rod is made of elastic material, and the elastic clamping force of the limiting rod can be dynamically adjusted according to the wind force. In light winds, the windproof cover is kept in close contact with the Beckman beam deflectometer. In strong winds, the windproof cover is tightly "locked" by elastic deformation, which neither interferes with the instrument nor prevents the windproof cover from being in an effective windproof position, thus continuously isolating the wind from the direct impact of the wind on the beam.

[0009] Preferably, the load-bearing component includes a fixed base, which is fixed to the bottom of the support beam. Multiple hooks are fixed to the bottom of the fixed base, and a load-bearing block is fastened to the middle of the side wall of each hook. This step, by setting the fixed base, hooks, and load-bearing block, can "compact" the contact between the adjusting screw and the road surface. If there is a slight protrusion on the road surface, the pressure of the load-bearing block can cause slight deformation of the support beam, so that the multiple adjusting screws on the bottom surface of the support beam are completely in contact with the road surface. At the same time, the "vertical pressure" of the weight of the load-bearing block can counteract the influence of lateral forces, prevent the support beam from tilting, and ensure that the lever system is in an ideal state of vertical force and free rotation.

[0010] Preferably, the detection component includes a fixing block, which is fixed to the top of the front beam. A level measuring instrument is mounted on both sides of the fixing block. This step, by installing the fixing block on the Beckman beam deflectometer, can display the horizontal status of the main beam in real time. The measuring personnel can fine-tune the instrument position by adjusting the adjusting screw until the fixing block shows that the main beam is completely horizontal, thus eliminating the reference error of "initial tilt" from the source.

[0011] Preferably, a handle is fixed to the top of the support beam, and an anti-slip pad is installed in the middle of the side wall of the handle. The anti-slip pad is made of elastic material. This step, by setting the handle and the anti-slip pad, can provide a non-slip and stable grip point, allowing the measuring personnel to grip it steadily with one or both hands, reducing the risk of slipping, and at the same time reducing direct contact between the hand and the metal surface of the support beam.

[0012] Preferably, a suction cup is fixed to the bottom of the adjusting screw. The suction cup is made of an elastic material. This step involves installing a suction cup made of flexible rubber at the bottom of the adjusting screw, which can slightly deform to fit the minor unevenness of the road surface, forming surface contact adsorption, reducing the tilt of the adjusting screw, keeping the adjusting screw perpendicular to the road surface, ensuring uniform force on the main beam support point, adapting to uneven support surfaces, and reducing instability caused by point contact.

[0013] The beneficial effects of this utility model are as follows: 1. The Beckman beam deflection meter described in this utility model addresses the issue that during outdoor testing, crosswinds or gusts can directly act on the main beam of the Beckman beam, generating upward or downward "lifting forces" or lateral "swaying displacements." These additional displacements can be misidentified as "road deflection," leading to falsely high or low readings. By setting up a first telescopic plate, a second telescopic plate, a slot, a telescopic rod, clamps, and a windproof cover, a "local windless zone" can be created, directly blocking the contact between the wind and the main beam, reducing the direct impact of wind on the beam and the measuring device, making the deflection reading more stable, and reducing random errors. Furthermore, during outdoor testing, the wind can carry sand, gravel, leaves, and other debris. If these debris adheres to the beam or the connecting rod of the Beckman beam, it can cause the beam to rotate and become stuck, resulting in poor contact between the dial indicator and the connecting rod, or even scratching precision components. Setting up a windproof cover can form a physical barrier, reducing the intrusion of debris and lowering the risk of equipment failure.

[0014] 2. The Beckman beam deflectometer described in this utility model, by setting a fixed base, hooks and a load-bearing block, can "compact" the contact between the adjusting screw and the road surface. If there is a slight protrusion on the road surface, the pressure of the load-bearing block can cause slight deformation of the support beam, so that the multiple adjusting screws on the bottom surface of the support beam are completely in contact with the road surface. At the same time, the "vertical pressure" of the weight of the load-bearing block can offset the influence of the lateral force, prevent the support beam from tilting, and ensure that the lever system is in an ideal state of vertical force and free rotation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the mating structure of the abutment rod and the dial indicator in this utility model; Figure 3 This is a schematic diagram of the cooperative structure of the front beam and the rear beam in this utility model; Figure 4 This is a schematic diagram of the cooperative structure of the windproof cover and the limiting rod in this utility model; Figure 5 This is a schematic diagram of the cooperation structure between the handle and the support beam in this utility model.

[0017] Legend: 1. Rear beam; 11. Front beam; 12. End beam; 13. Upright pole; 14. Hinge plate; 15. Support beam; 16. Support plate; 17. Adjusting screw; 18. Support rod; 19. Movable rod; 110. Support rod; 111. Dial indicator; 112. Abutment rod; 2. First telescopic plate; 21. Second telescopic plate; 22. Groove; 23. Telescopic rod; 24. Clamp; 25. Windproof cover; 3. Limiting rod; 4. Fixed seat; 41. Hook; 42. Load-bearing block; 5. Fixed block; 51. Level measuring instrument; 6. Handle; 61. Anti-slip mat; 7. Suction cup. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Specific implementation examples are given below.

[0020] like Figures 1 to 5As shown, a Beckman beam deflectometer according to an embodiment of the present invention includes a rear beam 1, a front beam 11 installed in the middle of the side wall of the rear beam 1, an end beam 12 installed in the middle of the side wall of the front beam 11, a vertical rod 13 fixed to the bottom of the end beam 12, hinge plates 14 hinged to both sides of the rear beam 1, a support beam 15 fixed to the bottom of the hinge plate 14, support plates 16 fixed to both sides of the support beam 15, adjusting screws 17 threaded to the middle of the side walls of the support beam 15 and the support plate 16, and a support rod 1 fixed to the top of the support beam 15. 8. A movable rod 19 is rotatably connected to the middle of the inner wall of the support rod 18. A support rod 110 is slidably connected to the middle of the side wall of the movable rod 19. A dial indicator 111 is installed in the middle of the side wall of the support rod 110. An abutment rod 112 is installed on the top of the rear beam 1. The abutment rod 112 and the dial indicator 111 are correspondingly set. A windproof component is provided in the middle of the side wall of the support beam 15. A load-bearing component is provided at the bottom of the support beam 15. A detection component is provided on the top of the front beam 11. The measuring personnel install the rear beam 1 and the front beam 11 together and measure the installed weight. The Beckman beam deflectometer is placed on the road surface, and the end beam 12 is positioned near the load wheel. Multiple adjusting screws 17 are then adjusted to bring the upright 13 into contact with the road surface. At this point, the Beckman beam deflectometer will be horizontal with the assistance of the detection components. The operator then moves the support rod 110, causing it to slide along the side wall of the movable rod 19, so that the dial indicator 111 probe contacts the abutment rod 112. The position of the support rod 110 is then fixed. The load wheel is then activated, and its movement causes the load wheel to... When the road surface deforms, the upright 13 that is in contact with the road surface will move downward. When the upright 13 moves, it will cause the end beam 12 and the front beam 11 to move downward. Since the rear beam 1 and the hinge plate 14 are hinged, the rear beam 1 will cause the abutment rod 112 to move upward, so that the dial indicator 111 displays the displacement of the rear beam 1, thereby calculating the deflection value of this section of the road surface. During the measurement process, the windproof component will protect the external force from interfering with the measurement data from both sides, while the load-bearing component will fix the position of the support beam 15.

[0021] like Figures 1 to 5As shown, the windproof component includes a first telescopic plate 2, which is slidably connected to the inner wall of the support beam 15. A second telescopic plate 21 is slidably connected to the middle of the inner side wall of the first telescopic plate 2. Grooves 22 are provided on both sides of the support beam 15, the first telescopic plate 2, and the second telescopic plate 21. A telescopic rod 23 is installed in the middle of the inner side wall of the groove 22. A pair of clamps 24 are fastened to the middle of the side wall of the telescopic rod 23. The clamps 24 are made of deformable material, and a windproof cover 25 is fixed to the middle of the side wall of the clamps 24. The wind shield 25 has an arc-shaped structure. After the surveyor places the Beckman beam deflectometer on the road surface, the first telescopic plate 2 and the second telescopic plate 21 inside the support beam 15 are pulled open. Then, multiple telescopic rods 23 are inserted into the slots 22 on both sides of the support beam 15, the first telescopic plate 2, and the second telescopic plate 21. The telescopic rods 23 are rotated so that they are locked inside the slots 22. Then, the clamps 24 are fastened to the side walls of the telescopic rods 23. At this time, the side walls of the clamps 24 are... The wind shield 25 protects the Beckman beam deflectometer from both sides. During outdoor testing, crosswinds or gusts can directly affect the main beam of the Beckman beam, generating upward or downward "lifting force" or lateral "swaying displacement". This extra displacement can be misidentified as "road deflection", resulting in falsely high or low readings. By setting up the first telescopic plate 2, the second telescopic plate 21, the slot 22, the telescopic rod 23, the clamp 24, and the wind shield 25, a "local windless zone" can be formed, directly blocking the contact between the wind and the main beam, reducing the direct impact of wind on the beam and the measuring device, making the deflection reading more stable and reducing random errors. In addition, during outdoor testing, the wind can carry sand, gravel, leaves and other debris. If these debris adheres to the beam or the abutment rod 112 of the Beckman beam, it can cause the beam to rotate and become stuck, the dial indicator 111 and the abutment rod 112 to have poor contact, or even scratch precision components. The wind shield 25 forms a physical barrier to reduce the intrusion of debris and reduce the risk of equipment failure.

[0022] like Figure 1 , Figure 2 and Figure 4 As shown, a limiting rod 3 is fixed in the middle of the side wall of the wind shield 25. The limiting rod 3 is made of elastic material. When the wind shields 25 on both sides approach each other, the limiting rod 3 on the side wall of the wind shield 25 will restrict the range of motion of the wind shield 25. The elastic clamping force of the limiting rod 3 can be dynamically adjusted according to the wind force. In light wind, the wind shield 25 is kept in contact with the Beckman beam deflectometer. In strong wind, the wind shield 25 is tightly "locked" by elastic deformation. This ensures that the wind shield 25 is always in an effective windproof position and continuously isolates the direct impact of the wind on the beam.

[0023] like Figures 1 to 5As shown, the load-bearing component includes a fixed base 4, which is fixed to the bottom of the support beam 15. Multiple hooks 41 are fixed to the bottom of the fixed base 4, and load-bearing blocks 42 are fastened to the middle of the side wall of the hooks 41. The measuring personnel fasten the multiple load-bearing blocks 42 onto the hooks 41 accordingly. When the rear beam 1 rotates on the support beam 15, the multiple load-bearing blocks 42 installed at the bottom of the support beam 15 will fix the position of the support beam 15. This step, by setting the fixed base 4, hooks 41 and load-bearing blocks 42, can "compact" the contact between the adjusting screw 17 and the road surface. If there is a slight protrusion on the road surface, the pressure of the load-bearing blocks 42 can cause the support beam 15 to deform slightly, so that the multiple adjusting screws 17 on the bottom surface of the support beam 15 are completely in contact with the road surface. At the same time, the "vertical pressure" of the weight of the load-bearing blocks 42 can offset the influence of the lateral force, prevent the support beam 15 from tilting, and ensure that the lever system is in an ideal state of vertical force and free rotation.

[0024] like Figure 2 and Figure 3 As shown, the detection component includes a fixing block 5, which is fixed to the top of the front beam 11. A level measuring instrument 51 is mounted on both sides of the fixing block 5. This step, by installing the fixing block 5 on the Beckman beam deflectometer, can display the horizontal status of the main beam in real time. The measuring personnel can fine-tune the position of the instrument by adjusting the adjusting screw 17 until the fixing block 5 shows that the main beam is completely horizontal, thus eliminating the reference error of "initial tilt" from the source.

[0025] like Figure 1 , Figure 3 and Figure 5 As shown, a handle 6 is fixed to the top of the support beam 15, and an anti-slip pad 61 is installed in the middle of the side wall of the handle 6. The anti-slip pad 61 is made of elastic material. By setting the handle 6 and the anti-slip pad 61, this step can provide a non-slip and stable grip point, allowing the measuring personnel to grip it steadily with one or both hands, reducing the risk of slipping, and reducing direct contact between the hand and the metal surface of the support beam 15.

[0026] like Figures 1 to 5 As shown, a suction cup 7 is fixed to the bottom of the adjusting screw 17. The suction cup 7 is made of elastic material. This step involves installing a flexible rubber suction cup 7 at the bottom of the adjusting screw 17, which can slightly deform to fit the minor unevenness of the road surface, forming surface contact adsorption, reducing the tilt of the adjusting screw 17, keeping the adjusting screw 17 perpendicular to the road surface, ensuring that the main beam support point is evenly stressed, adapting to uneven support surfaces, and reducing instability caused by point contact.

[0027] Working Principle: The surveyor installs the rear beam 1 and front beam 11 together, places the installed Beckman beam deflectometer on the road surface, and then positions the end beam 12 near the load wheel. Multiple adjusting screws 17 are then adjusted to bring the upright 13 into contact with the road surface. At this point, the Beckman beam deflectometer is horizontal with the assistance of the detection components. The surveyor then moves the support rod 110, causing it to slide along the side wall of the movable rod 19, bringing the dial indicator 111 probe into contact with the abutment rod 112. The position of the support rod 110 is then fixed. The load wheel is then activated, causing road surface deformation. The upright 13, in contact with the road surface, will move downwards. This movement of the upright 13 will cause the end beam 12 and front beam 11 to move downwards. Since the rear beam 1 is hinged to the hinge plate 14, the rear beam 1 will cause the abutment rod 112 to move upwards, causing the dial indicator 111 to display the displacement of the rear beam 1. This allows the deflection value of this section of the road surface to be calculated. In the process, the windproof components protect the measurement data from external forces from both sides, while the load-bearing components fix the position of the support beam 15. After the surveyor places the Beckman beam deflectometer on the road surface, the first telescopic plate 2 and the second telescopic plate 21 inside the support beam 15 are pulled open. Then, multiple telescopic rods 23 are inserted into the slots 22 on both sides of the support beam 15, the first telescopic plate 2, and the second telescopic plate 21. The telescopic rods 23 are rotated so that they are locked inside the slots 22. Then, the clamps 24 are fastened to the side wall of the telescopic rods 23. At this time, the windproof covers 25 on the side wall of the clamps 24 will protect the Beckman beam deflectometer from both sides. When the windproof covers 25 on both sides are close to each other, the limiting rods 3 on the side wall of the windproof covers 25 will restrict the range of motion of the windproof covers 25. The surveyor fastens multiple load-bearing blocks 42 onto the hooks 41. When the rear beam 1 rotates on the support beam 15, the multiple load-bearing blocks 42 installed at the bottom of the support beam 15 will fix the position of the support beam 15.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A Beckman beam deflectometer, comprising a rear beam (1), characterized in that: A front beam (11) is installed in the middle of the side wall of the rear beam (1), and an end beam (12) is installed in the middle of the side wall of the front beam (11). A vertical rod (13) is fixed to the bottom of the end beam (12). Hinges (14) are hinged to both sides of the rear beam (1). A support beam (15) is fixed to the bottom of the hinge plate (14). A support plate (16) is fixed to both sides of the support beam (15). An adjusting screw (17) is threaded to the middle of the side wall of the support beam (15) and the support plate (16). A support rod is fixed to the top of the support beam (15). (18) A movable rod (19) is rotatably connected to the middle of the inner side wall of the support rod (18). A support rod (110) is slidably connected to the middle of the side wall of the movable rod (19). A dial indicator (111) is installed in the middle of the side wall of the support rod (110). An abutment rod (112) is installed on the top of the rear beam (1). The abutment rod (112) and the dial indicator (111) are set accordingly. A windproof component is provided in the middle of the side wall of the support beam (15). A load-bearing component is provided at the bottom of the support beam (15). A detection component is provided on the top of the front beam (11).

2. The Beckman beam deflectometer according to claim 1, characterized in that: The windproof component includes a first telescopic plate (2), which is slidably connected to the inner wall of the support beam (15). A second telescopic plate (21) is slidably connected to the middle of the inner side wall of the first telescopic plate (2). The support beam (15), the first telescopic plate (2), and the second telescopic plate (21) are all provided with slots (22) on both sides. A telescopic rod (23) is installed in the middle of the inner side wall of the slot (22). A pair of clamps (24) are fastened in the middle of the side wall of the telescopic rod (23). The clamps (24) are made of deformable material. A windproof cover (25) is fixed in the middle of the side wall of the clamps (24). The windproof cover (25) is an arc-shaped structure.

3. The Beckman beam deflectometer according to claim 2, characterized in that: A limiting rod (3) is fixed in the middle of the side wall of the windproof cover (25), and the limiting rod (3) is made of elastic material.

4. The Beckman beam deflectometer according to claim 1, characterized in that: The load-bearing component includes a fixed seat (4), which is fixed to the bottom of the support beam (15). Multiple hooks (41) are fixed to the bottom of the fixed seat (4), and a load-bearing block (42) is fastened to the middle of the side wall of the hook (41).

5. A Beckman beam deflectometer according to claim 1, characterized in that: The detection component includes a fixing block (5), which is fixed to the top of the front beam (11), and a level measuring instrument (51) is mounted on both sides of the fixing block (5).

6. A Beckman beam deflectometer according to claim 4, characterized in that: The top of the support beam (15) is fixed with a handle (6), and an anti-slip pad (61) is installed in the middle of the side wall of the handle (6). The anti-slip pad (61) is made of elastic material.

7. A Beckman beam deflectometer according to claim 1, characterized in that: The bottom of the adjusting screw (17) is fixed with a suction cup (7), which is made of elastic material.

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