A load rail vehicle for flat plate load test

Abstract

The present invention provides a load rail vehicle for flatbed load testing, comprising a set of rails, a vehicle body, and a load unit. The vehicle body comprises a carrier plate and rail wheels, the rail wheels being clamped between the upper guardrail and the bottom plate of the rails, and the vehicle body being moved along the rails via the rail wheels. An anchor rod fixing device is mounted on the carrier plate, the anchor rod fixing device comprising an insertion rod device and a hammer rod device, the anchor rod being able to slide along an anchor rod hanging groove into a nail placing box, the hammer rod device comprising a hammer rod guide frame, and power hammers being mounted at both ends of the crossbar, and the anchor rods being nailed into the soil by the power hammers, thereby completing the fixing of the rails. The load rail vehicle for flatbed load testing provided by the present invention does not require the construction of an additional complex fixing frame to provide a reaction force, and is automatically fixed to the ground by anchor rods, thereby simplifying the site layout process and saving time and manpower. The present invention significantly improves construction efficiency and shortens the entire test cycle through automated processes, such as the automatic hanging, insertion, hammering, and removal of anchor rods.

Description

Technical Field

[0001] The invention relates to the technical field of foundation soil bearing capacity testing, and in particular to a load rail vehicle for flat plate load experiments. Background Art

[0002] The Plate Load Test (PLT) is a common field test method used to evaluate the bearing capacity and deformation characteristics of foundation soils. This method simulates the compressive forces acting on a building foundation by placing a rigid metal plate (a "plate") on the surface and gradually applying a vertical load to it. The PLT can be used to determine the bearing capacity, compression modulus, and other relevant parameters of the soil—information crucial for foundation design.

[0003] The basic process of a plate load test involves clearing the test site and ensuring the ground is level. A test pit of appropriate size is then excavated at the predetermined location to accommodate the test plate (bearing plate). The test plate is placed at the bottom of the pit, ensuring it is level and in close contact with the soil. A vertical load is applied to the plate using a jack or other loading device. Generally, the load is gradually increased, held for a period of time after each increase to observe the settlement at steady state. Common loading methods include stepwise loading and rapid loading. During each loading stage, the plate's settlement is measured using precision measuring instruments (such as a dial indicator or displacement transducer). The load and corresponding settlement are recorded, and a load-settlement curve is plotted. Key parameters such as the proportionality limit and ultimate bearing capacity are determined from the load-settlement curve. The proportionality limit is typically the end point of the initial straight line segment, representing the end of the elastic phase. The ultimate bearing capacity is the load value corresponding to a sharp increase in settlement. When the predetermined settlement or ultimate bearing capacity is reached, loading is stopped. Alternatively, unloading is performed to observe rebound.

[0004] Plate load tests have a wide range of applications and are suitable for various soil types, including sand, clay, and silt. The scale and depth of the test vary depending on the project requirements. For example, a shallow plate load test can be performed for a shallow foundation, while a deep plate load test may be required for a deep foundation.

[0005] The current flatbed load test site layout and equipment installation are complex. First, a fixed frame that provides a reaction force must be secured around the perimeter of the test pit, and then a jack and other equipment used to apply the load must be installed on top of the frame. This equipment is generally heavy and difficult to transport, and the reaction frame and load-applying device are typically hoisted and fixed separately, making installation time-consuming and labor-intensive, and removal equally inconvenient.

[0006] Traditional plate load tests require the construction of a complex fixed frame around the test pit to provide the reaction force, and the installation and disassembly process of the frame is very time-consuming and labor-intensive. The equipment used in traditional plate load tests is generally large and heavy, making it very inconvenient to carry. The transportation and movement of heavy equipment require the assistance of additional mechanical equipment. The reaction frame and load loading device usually need to be hoisted and fixed separately, which not only requires a lot of time and labor, but may also be affected by weather and site conditions. After the test is completed, dismantling the fixed frame and related equipment is also a tedious task, and the dismantling process also consumes a lot of time and manpower. There may be certain safety hazards in the traditional plate load test process, especially during the equipment transportation, installation and disassembly process. Traditional test equipment and methods have certain limitations in adapting to different terrain conditions and test requirements.

[0007] In summary, the main technical challenges facing existing plate load tests include complex site layout, inconvenient equipment transportation, time-consuming and labor-intensive installation and removal processes, safety issues, and limited flexibility. To address these issues, the new technical solution proposes an integrated, automated, and portable solution, aiming to improve the efficiency, convenience, and safety of plate load tests. Summary of the Invention

[0008] In view of the inconveniences in the layout and installation of the current flat plate load test site, the present invention provides an integrated flat plate load test load rail vehicle, which aims to improve the efficiency and safety of the flat plate load test.

[0009] The solution adopted by the present invention to solve the technical problem is: a load rail car for flat load test, comprising a set of rails, a car body and a load unit, wherein the set of rails are laid in parallel on both sides of a test pit.

[0010] The wheelbase is shortened and the chair folded for storage by pushing the bar rearwardly between the sides which folds the upper and lower ends of the vehicle body forwardly. The cam is provided with a plurality of guide wheels, and the guide wheels are provided with a plurality of guide wheels respectively. The guide wheels are provided with a plurality of guide wheels respectively. The guide wheels are provided with a plurality of guide wheels respectively. The guide wheels are provided with a plurality of guide wheels respectively.

[0011] Furthermore, the load unit includes a herringbone folding frame, the upper end of the herringbone folding frame is hinged, and the lower end is equipped with a track wheel and can be unfolded. The track wheel is also clamped between the upper eaves and the bottom plate. A folding link is provided on the outside of the herringbone folding frame as a limit rod to limit the unfolding angle of the folding frame. A hydraulic load device is suspended in the middle of the herringbone folding frame.

[0012] Furthermore, the herringbone folding frame includes two upper hinged support arms, wherein the lower end of the support arm close to the vehicle body is hinged to the vehicle body, and the lower end of the other support arm is installed with a track wheel. At the same time, a drive motor is installed on the support arm on which the track wheel is installed, and the track wheel is driven to rotate by the drive motor.

[0013] Furthermore, an annular groove is provided in the middle of the nail cap of the anchor rod.

[0014] Furthermore, the lower side of the hanging platform is provided with an inclined surface facing the middle of the two hanging platforms. During the downward pressing process, the movable baffle flips and slides along the inclined surface to the bottom of the nail cap or into the annular groove.

[0015] Furthermore, a driving device and a hydraulic device are installed on the carrier plate. The driving device adopts a diesel engine, which is connected to the rail wheel through a pulley and a belt, thereby driving the vehicle body to move on the rail.

[0016] Furthermore, the diameter of the nail cap is greater than the diameter of the nail body.

[0017] Beneficial effects of the present invention: The present invention provides a load rail vehicle for flat-plate load testing, which does not require the construction of an additional complex fixed frame to provide a reaction force. It is automatically fixed to the ground by anchor rods, which simplifies the site layout process and saves time and manpower. All necessary equipment is integrated into a movable vehicle body, which reduces the weight and volume of the equipment, making the entire system more portable and convenient for movement between different locations. The automated anchor rod fixing and removal mechanism reduces dependence on manual labor, reduces labor intensity, and improves construction efficiency. The present invention significantly improves construction efficiency and shortens the entire test cycle through automated processes, such as the automatic hanging, insertion, hammering, and removal of anchor rods.

[0018] Through its integrated and automated design, the load rail car effectively solves the problems existing in existing flat-bed load tests, such as complex site layout, inconvenient equipment transportation, time-consuming and labor-intensive installation process, and inconvenient dismantling process. It improves the efficiency, convenience and safety of the test while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a side structural schematic diagram of the load-carrying rail vehicle of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the rod insertion device.

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the rod insertion device.

[0023] Figure 5 yes Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the hammer rod device.

[0025] Figure 7 It is a schematic diagram of the process of anchor rod insertion into soil.

[0026] Figure 8 It is a schematic diagram of the process of pulling out the anchor rod.

[0027] Numbers in the figure: 1. Rail; 2. Car body; 3. Load unit; 4. Anchor rod; 5. Drive device; 6. Hydraulic device; 7. Cylinder; 8. Rod insertion device; 9. Hammer rod device; 11. Bottom plate; 12. Vertical plate; 13. Upper eaves; 14. Nail hole; 21. Track wheel; 22. Carrying plate; 31. Herringbone folding frame; 32. Folding connecting rod; 33. Hydraulic load device; 41. Nail body; 42. Nail cap; 43. Ring groove; 81. Rod insertion guide frame; 82. Anchor rod frame; 83. Nail box; 84. Hanging platform; 85. Rotating shaft; 851. Torsion spring; 86. Fixed baffle; 87. Moving baffle; 88. Anchor rod hanging groove; 89. Nail groove; 91. Hammer rod guide frame; 92. Cross bar; 93. Power hammer. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below.

[0029] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0030] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0031] Example 1: In order to improve the efficiency of the flatbed load test, the present invention provides a load rail vehicle for the flatbed load test, such as Figure 1 As shown, it includes a set of rails 1, a car body 2 and a load unit 3. The rail 1 includes a bottom plate 11 and a vertical plate 12 fixed on the bottom plate 11. The upper end of the vertical plate 12 extends laterally to one side to form an upper retaining eaves 13. The two rails 1 are laid in parallel, and the upper retaining eaves 13 on the upper side of the two rails 1 face the middle of the two rails 1. They are located on the bottom plate 11 outside the vertical plates 12 of the two rails 1, and nail holes 14 are evenly arranged along the direction of the rails 1.

[0032] A test pit is dug on the ground of the experimental site, a set of steel rails 1 is laid on the ground on both sides of the test pit, and a vehicle body 2 is driven between the steel rails 1.

[0033] The vehicle body 2 includes a carrier plate 22 and track wheels 21 . The track wheels 21 are inserted between the upper guardrail 13 and the bottom plate 11 of the rail 1 . The vehicle body 2 moves along the rail 1 via the track wheels 21 .

[0034] The carrier plate 22 is provided with a driving device 5 and a hydraulic device 6 . The driving device 5 is a diesel engine, which is connected to the track wheel 21 through a pulley and a belt, thereby driving the vehicle body 2 to move on the rail 1 .

[0035] An anchor rod fixing device is also installed on the carrier plate 22 , and the anchor rod fixing device includes an inserting rod device 8 and a hammer rod device 9 . The anchor rod includes a nail cap 42 and a nail body 41 . The diameter of the nail cap 42 is larger than the diameter of the nail body 41 .

[0036] The rod insertion device 8 includes a rod insertion guide frame 81, on which an oil cylinder 7 is installed. The telescopic end of the oil cylinder 7 is downward, and an anchor rod frame 82 is installed at the telescopic end of the oil cylinder 7. The anchor rod frame 82 includes an arc-shaped rod body with the arc mouth facing downward, and an anchor rod hanging groove 88 is provided on the lower side of the arc-shaped rod body. The lower side of the anchor rod hanging groove 88 is provided with symmetrical inward hanging platforms 84, and the width between the hanging platforms 84 is smaller than the width of the anchor rod hanging groove 88. Specifically, the width between the hanging platforms 84 is larger than the diameter of the nail body 41 and smaller than the diameter of the nail cap 42. The width of the anchor rod hanging groove 88 is larger than the diameter of the nail cap 42, so that the anchor rod can be hung in the anchor rod hanging groove 88 through the nail cap 42.

[0037] The two ends of the arc-shaped rod body extend to the outside of the two rails 1, and a horizontal nail box 83 is provided at the position corresponding to the nail hole 14. A nail groove 89 connected to the anchor rod hanging groove 88 is provided in the middle of the nail box 83. The nail groove 89 is located on the side of the vehicle body 2 in the walking direction and is provided with a fixed baffle 86. A movable baffle 87 is installed on the side facing away from the vehicle body 2 through a rotating shaft 85, and a torsion spring 851 is installed between the movable baffle 87 and the rotating shaft 85. The torsion spring 851 makes the movable baffle 87 in a vertical state in its natural state. A hanging platform 84 identical to the anchor rod hanging groove 88 is provided on the lower side of the opposite surface of the fixed baffle 86 and the movable baffle 87, and the anchor rod can slide along the anchor rod hanging groove 88 into the nail box 83.

[0038] The anchor rod is hung in the anchor rod hanging groove 88. Due to the curved rod body, the anchor rod can slide toward the end under the action of its own gravity, so that the anchor rod automatically enters the nail box 83.

[0039] In order to avoid interference between the anchor rod and the upper retaining eave 13 of the rail, a penetrating hollow area is set at the position of the anchor rod frame 82 corresponding to the upper retaining eave 13. When the anchor rod interferes with the upper retaining eave 13, the anchor rod frame moves downward, the lower end of the anchor rod presses on the upper retaining eave 13, and the upper end of the anchor rod extends from the hollow area, avoiding damage caused by the hard contact between the anchor rod and the upper retaining eave 13.

[0040] After the anchor rod is inserted into the ground, the anchor rod frame is lifted, and the anchor rod falls along the hollow area and slides into the anchor rod hanging groove 88 again.

[0041] The anchor rod rack 82 is pushed downward by the oil cylinder 7, and the anchor rod moved to the nail box 83 can be inserted into the ground below the rail 1 through the nail hole 14. The insertion depth ensures that the anchor rod can stand vertically.

[0042] After the anchor rod is inserted into the soil, the vehicle body 2 moves forward, and the anchor rod pushes the baffle 87 to turn up the movable baffle 87, thereby causing the anchor rod to escape from the nail box 83.

[0043] The hammer rod device 9 includes a hammer rod guide frame 91, on which the oil cylinder 7 is installed. A cross bar 92 is installed at the lower end of the oil cylinder 7. Both ends of the cross bar 92 extend above the nail holes 14 on both sides of the rail 1, and power hammers 93 are installed at both ends of the cross bar 92.

[0044] The anchor rod is initially inserted into and out of the ground below the rail 1 through the rod insertion device 8 and remains in an upright state. After the vehicle body 2 moves, the anchor rod is released from the nail box 83, and the hammer rod device 9 moves to the top of the anchor rod. The oil cylinder 7 of the hammer rod device 9 pneumatically extends downward, so that the power hammers 93 at both ends can press on the nail cap 42 of the anchor rod. The power hammer 93 starts to hammer the anchor rod and moves downward as the oil cylinder 7 extends, thereby nailing the anchor rod into the soil, completing the fixation of the rail 1. The above operation is repeated on each nail hole 14 to complete the fixation of the rail 1.

[0045] The oil cylinders 7 are all controlled by the hydraulic device 6 .

[0046] A load unit 3 is installed at the front end of the vehicle body 2. The load unit 3 includes a herringbone folding frame 31. The upper end of the herringbone folding frame 31 is hinged, and the lower end thereof is installed with a track wheel 21 and can be unfolded. The track wheel 21 is also clamped between the upper guardrail 13 and the bottom plate 11. A folding link 32 is provided on the outside of the herringbone folding frame 31 as a limit rod to limit the unfolding angle of the folding frame. A hydraulic load device 33 is suspended in the middle of the herringbone folding frame 31.

[0047] After the rail 1 is fixed, the vehicle body 2 moves along the rail 1 so that the load unit 3 corresponds to the test pit of the load test. The herringbone folding frame 31 is moved and unfolded through the track wheel 21 at the lower end. The hydraulic load device 33 corresponds to the pressure plate in the test pit, and the vertical load required for the load test is provided by the hydraulic load device 33.

[0048] After the test is completed, the herringbone folding frame 31 folds and contracts, and the car body 2 moves so that the rod insertion device 8 corresponds to the anchor rod on the rail 1. The cylinder 7 drives the arc rod body to move downward, and the nail box 83 is placed corresponding to the nail cap 42 of the anchor rod. An inclined surface is set on the lower side of the hanging platform 84 of the movable baffle 87. During the downward pressing process, the movable baffle 87 flips and slides to the bottom of the nail cap 42 with the inclined surface, so that the hanging platform 84 of the fixed baffle 86 and the movable baffle 87 can hook the nail cap 42 of the anchor rod. The cylinder 7 drives the arc rod body up, pulls the anchor rod out of the ground, and completes the disassembly of the rail 1.

[0049] Specifically, an annular groove 43 is provided in the middle of the nail cap 42. The width of the annular groove 43 is greater than the thickness of the hanging platform 84. During the removal of the anchor rod, the nail cap 42 is hammered into the soil, and the underside of the nail cap 42 is close to the upper surface of the bottom of the rail 1. The hanging platform 84 cannot directly hook onto the underside of the nail cap 42. Therefore, the annular groove 43 is provided on the nail cap 42. The annular groove 43 is maintained at a certain height above the base plate 11, and the hanging platform 84 is hooked into the annular groove 43. The anchor rod is then lifted up by the hanging platform 84 to complete the removal.

[0050] The specific usage of the load rail car is as follows: select a suitable test site, ensure that the ground is flat and suitable for flat plate load testing, and dig a test pit according to the test needs, and prepare the position for installing the track on both sides of the test pit symmetrically. At this time, the rails 1 are placed parallel to each other on both sides of the test pit. They can be fixed in place by the deadweight of the rails 1, or they can be fixed by manually hammering anchor rods into the nail holes 14 at both ends of the rails 1. Move the load rail car to the test site, and the car body 2 drives between the rails 1 through the rail wheels 21 below. The rail wheels 21 press on the bottom plate 11 of the rails 1, so that the rail wheels 21 are located between the upper guardrail 13 and the bottom plate 11. The upper guardrail 13 blocks the rail wheels 21 to prevent the car body 2 from being lifted up during the load test, thereby providing a reaction force during the load test.

[0051] After the vehicle frame is positioned on the rail 1, the rod insertion device 8 is activated, and the hydraulic cylinder 7 drives the anchor rod holder 82 downward, inserting the anchor rod through the nail hole 14 into the ground below the rail 1, ensuring that the anchor rod can stand vertically. This step is the initial insertion of the anchor rod into the soil. The vehicle body 2 is moved so that the anchor rod pushes against the baffle 87, causing the movable baffle 87 to flip up, allowing the anchor rod to be released from the nail magazine 83, completing the initial fixation of the anchor rod. As the vehicle body 2 moves forward, the hydraulic cylinder 7 synchronously and slowly raises the anchor rod holder 82 upward.

[0052] The vehicle body 2 moves until the hammer rod device 9 moves above the anchor rod, and the vehicle body 2 stops moving. The oil cylinder 7 of the hammer rod device 9 drives the power hammer 93 to press on the nail cap 42 of the anchor rod. The power hammer 93 starts to hammer the anchor rod and moves downward as the oil cylinder 7 extends, nailing the anchor rod into the soil until the nail cap 42 presses on the bottom plate 11 of the rail 1.

[0053] Repeat the above steps until all the corresponding nail holes 14 on the rail 1 are inserted with anchor rods and fixed, thus completing the fixation of the rail 1.

[0054] The load unit 3 installed at the front end of the vehicle body 2 is unfolded by the herringbone folding frame 31 and moved along the rail 1 by the track wheel 21. When unfolded into place, the hydraulic load device 33 corresponds to the pressure plate in the test pit, ready to provide vertical load.

[0055] The required vertical load is applied via the hydraulic loading device 33 to initiate the plate load test. The settlement during loading is monitored, and the relationship between load and settlement is recorded. Precision measuring instruments are used to record settlement changes during loading to ensure data accuracy and reliability. Load-settlement curves are then analyzed to determine key parameters such as proportional limits and ultimate bearing capacity.

[0056] After the test is completed, the vehicle body 2 moves so that the rod insertion device 8 corresponds to the anchor rod on the rail 1. The oil cylinder 7 drives the anchor rod frame 82 downward, and the nail box 83 is placed corresponding to the nail cap 42 of the anchor rod. The lower side of the hanging platform 84 of the movable baffle 87 is provided with an inclined surface. During the downward pressure process, the movable baffle 87 flips and slides under the nail cap 42 along the inclined surface, so that the fixed baffle 86 and the hanging platform 84 of the movable baffle 87 can hook the nail cap 42 of the anchor rod. The oil cylinder 7 drives the anchor rod frame 82 to rise, and the anchor rod is pulled out of the ground, completing the removal of the rail 1.

[0057] After the anchor rod is removed, the loaded rail car and its ancillary equipment will be recovered to the designated location and the equipment will be maintained to ensure that it is in good condition for the next use.

[0058] Through the above steps, the load rail car completes the entire process from preparation to installation, testing, and disassembly. The use of this load rail car greatly simplifies the flatbed load test process, improves test efficiency, and reduces dependence on manpower through automated processes, improving test safety and accuracy.

[0059] Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A load rail car for flatbed load testing, characterized in that: The vehicle comprises a set of steel rails (1), a vehicle body (2) and a load unit (3), wherein the set of steel rails (1) is laid in parallel on both sides of a test pit. The rail (1) includes a bottom plate (11) and a vertical plate (12) fixed on the bottom plate (11), the upper end of the vertical plate (12) extends laterally toward one side to form an upper retaining eave (13), the upper retaining eaves (13) on the upper side of the two rails (1) face toward the middle of the two rails (1), and nail holes (14) are evenly arranged on the bottom plate (11) outside the vertical plates (12) of the two rails (1); The vehicle body (2) includes a carrier plate (22) and a track wheel (21), the track wheel (21) is inserted between the upper guardrail (13) and the bottom plate (11) of the rail (1), and the vehicle body (2) moves along the rail (1) via the track wheel (21); An anchor rod fixing device is installed on the carrier plate (22), and the anchor rod fixing device includes an inserting rod device (8) and a hammer rod device (9). The inserting rod device (8) includes an inserting rod guide frame (81), and an oil cylinder (7) is installed on the inserting rod guide frame (81). The telescopic end of the oil cylinder (7) is downward, and an anchor rod frame (82) is installed at the telescopic end of the oil cylinder (7). The anchor rod frame (82) includes an arc-shaped rod body with an arc opening facing downward, and an anchor rod hanging groove (88) is provided on the lower side of the arc-shaped rod body. The anchor rod includes a nail cap (42) and a nail body (41), and the anchor rod is suspended in the anchor rod hanging groove (88). A symmetrical inward hanging platform (84) is provided on the lower side of the anchor rod hanging groove (88), and both ends of the arc-shaped rod body extend to the outside of the two rails (1), and a horizontal nail placing box (83) is provided at the position corresponding to the nail hole (14). A nail groove (89) connected to the anchor rod hanging groove (88) is provided in the middle of the nail placing box (83), and a fixed baffle (86) is provided on the side of the nail groove (89) located in the walking direction of the vehicle body (2). A moving baffle (87) is installed on the side facing away from the vehicle body (2) through a rotating shaft (85), and a torsion spring (851) is installed between the moving baffle (87) and the rotating shaft (85). The moving baffle (87) is naturally in a vertical state through the torsion spring (851). A hanging platform (84) identical to the anchor rod hanging groove (88) is provided on the lower side of the opposite surface of the fixed baffle (86) and the moving baffle (87). The anchor rod can slide along the anchor rod hanging groove (88) into the nail placing box (83). The hammer rod device (9) includes a hammer rod guide frame (91), an oil cylinder (7) is installed on the hammer rod guide frame, a cross bar (92) is installed at the lower end of the oil cylinder (7), both ends of the cross bar (92) extend above the nail holes (14) on both sides of the rail (1), and a power hammer (93) is installed at both ends of the cross bar (92). The power hammer (93) is used to nail the anchor rod into the soil to complete the fixation of the rail (1). The above operation is repeated on each nail hole (14) to complete the fixation of the rail (1). A load unit (3) is installed at the front end of the vehicle body (2), and a vertical load is provided by the load unit (3) to perform the experiment.

2. The load rail vehicle for flatbed load testing according to claim 1, characterized in that: The load unit (3) includes a herringbone folding frame (31), the upper end of the herringbone folding frame (31) is hinged, and the lower end thereof is installed with a track wheel (21) and can be unfolded. The track wheel (21) is also clamped between the upper guardrail (13) and the bottom plate (11). A folding connecting rod (32) is provided on the outside of the herringbone folding frame (31) as a limit rod to limit the unfolding angle of the folding frame. A hydraulic load device (33) is suspended and installed in the middle of the herringbone folding frame (31).

3. The load rail vehicle for flatbed load testing according to claim 2, characterized in that: The herringbone folding frame (31) includes two upper hinged support arms, wherein the lower end of the support arm close to the vehicle body (2) is hinged to the vehicle body (2), and the lower end of the other support arm is installed with a track wheel (21). At the same time, a driving motor is installed on the support arm on which the track wheel (21) is installed, and the track wheel (21) is driven to rotate by the driving motor.

4. The load rail vehicle for flatbed load testing according to claim 1, characterized in that: An annular groove (43) is provided in the middle of the nail cap (42) of the anchor rod.

5. The load rail vehicle for flat-plate load testing according to claim 1 or 4, characterized in that: The lower side of the hanging platform (84) is provided with an inclined surface facing the middle of the two hanging platforms (84). During the pressing process, the movable baffle (87) flips and slides along the inclined surface to the bottom of the nail cap (42) or into the annular groove (43).

6. The load rail vehicle for flatbed load testing according to claim 1, characterized in that: A driving device (5) and a hydraulic device (6) are installed on the carrier plate (22). The driving device (5) uses a diesel engine, which is connected to the track wheel (21) through a pulley and a belt, thereby driving the vehicle body (2) to move on the rail (1).

7. The load rail vehicle for flatbed load testing according to claim 1, characterized in that: The diameter of the nail cap (42) is greater than the diameter of the nail body (41).

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