Railway roadbed pressure implementation field detection device

Abstract

The utility model relates to the field of roadbed compaction detection, and discloses a railway roadbed compaction field detection device, which comprises a load plate, the lower end of the penetration rod is connected with the upper surface of the load plate, a movable joint is arranged at the upper end of the penetration rod and can achieve the telescopic effect, and a pressure sensor is arranged in the movable joint and used for measuring the pressure borne by the top end of the movable joint; the two supporting frames are erected on the two sides of the penetration rod, one supporting frame is fixedly connected with one end of a force application rope, the other supporting frame is provided with a winch assembly, the winch assembly is connected with the other end of the force application rope, and the middle of the force application rope is used for providing downward acting force for the top of the movable joint; the measuring assembly is used for measuring the vertical displacement of the load plate; and the control unit is electrically connected with the pressure sensor and the measuring assembly. The device is not provided with a long-distance rod piece, so that the material cost of the device is reduced; and the deflection of the load plate can be directly obtained through the distance measuring sensor, so that the difficulty of measurement work is reduced.

Description

Technical Field

[0001] The utility model relates to the field of subgrade compaction detection, in particular to a field detection device for railway subgrade compaction. Background Art

[0002] When detecting the compaction quality of railway subgrades in China, the foundation coefficient K 30 , and the foundation coefficient K 30 test is a one-way single-cycle load test using a load plate with a diameter of 30 cm. The relationship between the pressure per unit area of the load plate and the measured settlement at the center point of the load plate is determined through the loading test.

[0003] The patent with the publication number CN102677646B discloses a lever-type bearing ratio automatic tester, which is applicable to the detection of the compaction quality of railway and highway subgrades, transition sections between subgrades and transverse structures, and narrow sections, reducing the dependence on traditional large reaction devices (such as large rollers or trucks).

[0004] During the test, pressure is applied to the bearing device through the force application rod to achieve step-by-step loading of the subgrade. The bearing capacity of the conventional reaction device should be greater than the maximum test load of 10 KN. This requires a relatively high quality of the force application rod, otherwise it is difficult to bear large pressures. In addition, after the L-shaped measuring rod generates a vertical displacement, it will rotate around the support seat. The measured value of the displacement sensor needs to consider the distances between the displacement sensor and the L-shaped measuring rod and the support seat respectively before the actual vertical displacement of the L-shaped measuring rod can be calculated, which increases the difficulty of the measurement work. Content of the Utility Model

[0005] The utility model aims to provide a field detection device for railway subgrade compaction to overcome the above deficiencies.

[0006] In order to achieve the above object, the technical solution of the utility model is as follows:

[0007] A field detection device for railway subgrade compaction, comprising:

[0008] A load plate;

[0009] A penetration rod whose lower end is connected to the upper surface of the load plate. An articulated joint is provided at the upper end of the penetration rod. The articulated joint can achieve a telescopic effect. A pressure sensor is arranged inside the articulated joint. The pressure sensor is used to measure the pressure received at the top of the articulated joint;

[0010] Two support frames erected on both sides of the penetration rod. One of the support frames is fixedly connected to one end of a force application rope. A hoisting component is arranged on the other support frame. The hoisting component is connected to the other end of the force application rope. The middle part of the force application rope is used to provide a downward acting force to the top of the articulated joint;

[0011] A measuring assembly for measuring the vertical displacement of the load plate; and

[0012] A control unit electrically connected to the pressure sensor and the measuring assembly.

[0013] Further, the movable section includes:

[0014] Two pressure-receiving plates respectively located at the upper and lower ends of the pressure sensor, and the lower pressure-receiving plate is fixedly connected to the upper end of the penetration rod;

[0015] A limiting member for restricting the vertical sliding of the upper pressure-receiving plate.

[0016] Further, the limiting member is a limiting rod arranged in the vertical direction, and the two pressure-receiving plates are respectively slidably connected to the limiting rod.

[0017] Further, a pulley is rotatably connected to the upper surface of the upper pressure-receiving plate, the upper end of the pulley is frictionally connected to the middle of the force-applying rope, the force-applying rope has an inverted "V" shape structure, and the two ends of the force-applying rope form the same angle with the horizontal direction.

[0018] Further, the hoisting assembly includes a driving motor and a speed reducer fixedly connected to the bottom plate of the other supporting frame, the driving motor is electrically connected to the control unit, and the driving motor is in transmission connection with the speed reducer, the output shaft of the speed reducer is connected with a hoisting drum, and the other end of the force-applying rope is wound around the hoisting drum.

[0019] Further, the measuring assembly includes:

[0020] A distance measuring plate fixedly connected to the outer side wall of the penetration rod;

[0021] A top frame detachably connected to the tops of the two supporting frames, the top frame is located above the pulley; and

[0022] A distance measuring sensor installed on the top frame, the distance measuring sensor is located directly above the distance measuring plate, and is electrically connected to the control unit, and the distance measuring plate is used for measuring the displacement of the distance measuring plate in the vertical direction.

[0023] Further, the distance measuring sensor is a laser distance measuring sensor, an ultrasonic distance measuring sensor or an infrared distance measuring sensor.

[0024] Further, the horizontal distance between the supporting frame and the edge of the load plate is greater than 1 m.

[0025] Further, a counterweight is arranged on the supporting frame, and the counterweight on one of the supporting frames is fixedly connected to one end of the force-applying rope.

[0026] Furthermore, the material of the force - applying rope is steel wire rope.

[0027] The utility model has at least the following advantages compared with the prior art:

[0028] The utility model applies a downward force to the penetration rod by using the force - applying rope, and winds and unwinds the other end of the force - applying rope through the hoisting assembly, which can achieve the effect of continuously adjusting the acting force. The downward acting force of the penetration rod is measured by a pressure sensor, and then it can be converted into the pressure applied to the load plate, which can achieve the effect of gradually increasing the load value; the vertical displacement of the load plate is measured by the measuring assembly, and the settlement amount of the load plate can be obtained.

[0029] The utility model does not set long - distance rods, which reduces the material cost of the device; the settlement amount of the load plate can be directly obtained through the distance - measuring sensor, which reduces the difficulty of the measurement work. It can be applied to the quality inspection of the compaction of railway and highway subgrades, the transition section between transverse structures and narrow sections, and reduces the dependence on traditional large - scale reaction devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the overall structure of the on - site detection device for railway subgrade compaction of the present utility model;

[0032] Figure 2 For the present utility model Figure 1 is a partial enlarged view of area A in it.

[0033] Reference numerals: 1. Load plate; 2. Penetration rod; 3. Pressure sensor; 4. Support frame; 5. Force - applying rope; 6. Pressure - receiving plate; 7. Limit rod; 8. Pulley; 9. Driving motor; 10. Reducer; 11. Hoisting drum; 12. Distance - measuring plate; 13. Top frame; 14. Distance - measuring sensor; 15. Counterweight. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0035] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Refer to Figure 1-2 , the present utility model provides a field detection device for railway subgrade compaction, including a load plate 1, a penetration rod 2, a support frame 4, a measurement component, and a control unit. Among them, the load plate 1 is a circular steel plate with a diameter of 30 cm and a plate thickness of 25 mm. The load plate 1 is provided with a spirit level (not shown in the figure); the penetration rod 2 is located above the load plate 1. The lower end of the penetration rod 2 is connected to the upper surface of the load plate 1. The upper end of the penetration rod 2 is provided with a movable joint that can freely expand and contract. A pressure sensor 3 is arranged inside the movable joint, and the pressure sensor 3 is used to measure the pressure received at the top of the movable joint; there are two support frames 4, and the two support frames 4 are respectively erected on both sides of the penetration rod 2. The horizontal distance between the support frame 4 and the edge of the load plate 1 is greater than 1 m. One end of a force application rope 5 is fixedly connected to one of the support frames 4, and a hoisting component is arranged on the other support frame 4. The hoisting component is connected to the other end of the force application rope 5. The other end of the force application rope 5 is wound around the hoisting component. The material of the force application rope 5 is steel wire rope. The middle part of the force application rope 5 is used to provide a downward acting force to the top of the movable joint. Specifically, the middle part of the force application rope 5 is located above the movable joint. The hoisting component winds up the other end of the force application rope 5, and the middle part of the force application rope 5 can provide a downward acting force to the movable joint; the measurement component is used to measure the vertical displacement of the load plate 1, that is, it can measure the vertical settlement of the load plate 1 in the working state; the control unit is electrically connected to the pressure sensor 3 and the measurement component. The pressure sensor 3 can transmit the measured pressure information to the control unit. The pressure information is the downward acting force received by the load plate 1. The measurement component is used to transmit the measured vertical displacement information of the load plate 1 to the control component. The control unit is preferably a PLC device. The control unit is used to read the pressure information and displacement detailed information. The control unit is powered by an external power supply to provide power for the pressure sensor 3 and the measurement component during operation.

[0037] Preferably, the movable joint includes two pressure-receiving plates 6 and a limiting member. The vertical projection area of the pressure-receiving plate 6 is larger than the vertical projection area of the load plate 1. The two pressure-receiving plates 6 are respectively located at the upper and lower ends of the pressure sensor 3. The lower pressure-receiving plate 6 is fixedly connected to the upper end of the penetration rod 2; the limiting member is used to limit the vertical sliding of the upper pressure-receiving plate 6.

[0038] Specifically, the limiting member is a limiting rod 7 arranged in the vertical direction, and the two pressure plates 6 are respectively slidably connected to the limiting rod 7. In a specific embodiment of the present utility model, a plurality of limiting rods 7 are provided and distributed in a circumferential array along the axis of the penetration rod 2. The limiting rods 7 are a combination of bolts and nuts. The pressure plates 6 are flanges. The bolts penetrate the two flanges and are threadedly connected to the nuts. The nuts are loosely fitted with the flange below.

[0039] Optionally, a pulley 8 is rotatably connected to the upper surface of the upper pressure plate 6. The pulley 8 is a fixed pulley structure. The upper surface of the pulley 8 is frictionally connected to the middle portion of the force rope 5. The force rope 5 is in an inverted "V" shape, and the two ends of the force rope 5 are at the same angle with the horizontal direction. The force rope 5 adopts this structure so that the force rope 5 can only exert a downward force on the pulley 8 in the vertical direction, avoiding the applied force from forming an angle with the vertical direction, which would cause the penetration rod 2 to fall when the hoisting mechanism reels in the other end of the force rope 5.

[0040] Preferably, the winch assembly includes a drive motor 9 and a reducer 10 fixedly connected to the bottom plate of another support frame 4. The drive motor 9 is electrically connected to the control unit. The control unit can control the opening and closing of the drive motor 9, and the drive motor 9 is connected to the reducer 10 in a transmission connection. The use of the reducer 10 can achieve the effect of deceleration and torque increase. The output shaft of the reducer 10 is connected to the winch disc 11, and the winch disc 11 is wound with the other end of the force rope 5.

[0041] In the present invention, the measurement assembly includes a distance measuring plate 12, a top frame 13, and a distance measuring sensor 14. The distance measuring plate 12 is fixedly connected to the outer wall of the penetration rod 2 and is arranged horizontally. The top frame 13 is detachably connected to the top ends of the two support frames 4 and is located above the pulley 8. The distance measuring sensor 14 is mounted on the top frame 13 and is located directly above the distance measuring plate 12. The distance measuring sensor 14 is preferably a laser distance measuring sensor, an ultrasonic distance measuring sensor, or an infrared distance measuring sensor. The distance measuring plate 12 is used to measure its vertical displacement and is electrically connected to the control unit.

[0042] Preferably, each support frame 4 is provided with a counterweight 15, and the gravity exerted on the counterweight 15 on each support frame 4 should be no less than 5KN. The counterweight 15 on one of the support frames 4 is provided with a connecting ring, and the counterweight 15 on one of the support frames 4 is fixedly connected to one end of the force rope 5 through the connecting ring.

[0043] The working principle of this utility model:

[0044] The first step is to level the test surface of the selected site and sweep away the loose soil with a brush.

[0045] Step 2: Place the load plate 1 on the test ground, ensuring good contact between the load plate 1 and the test surface. If necessary, a layer of dry medium sand or gypsum putty can be laid on the surface of the test surface to ensure complete contact between the load plate 1 and the ground, and adjust it to a horizontal state with the help of the spirit level on the load plate 1.

[0046] Step 3: Apply a preloading load with a load value of 0.01 Mpa for about 30 s. After stabilization, remove the load and read the indication of the distance measuring sensor 14 as the initial reading of the settlement.

[0047] Step 4: Gradually load with an increment of 0.04 Mpa. For each increase in the load level, after the settlement under this load level has stabilized, read the load intensity and settlement readings. The actual settlement of the load plate 1 can be obtained by subtracting the settlement reading from the initial reading. When the settlement in 1 min is not greater than 1% of the total settlement generated under this load intensity, the settlement can be considered terminated. The stabilization time for each load level shall not be less than 3 min.

[0048] The test terminates when one of the following conditions is met:

[0049] When the total settlement exceeds the specified reference value (1.25 mm) and the number of loading levels is at least 5; when the load intensity is greater than 1.3 times the load value corresponding to the design standard and the number of loading levels is at least 5; when the load intensity reaches the foundation yield point.

[0050] Step 5: Unload the load. After terminating the test, unload in three levels. After each load level is unloaded and the deformation is stable, then unload the next level until it is completely unloaded.

[0051] Step 6: Sort out the results and draw a curve graph of the load intensity and settlement. Find out the load value corresponding to a settlement of 0.125 cm and calculate the foundation coefficient K 30 . K 30 = σ 1.25 / 1.25, where σ 1.25 is the load value corresponding to 0.125 cm.

[0052] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0053] The embodiments described above are only descriptions of the preferred embodiments of the present utility model and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A field detection device for railway subgrade compaction, characterized in that, Comprising: A load plate (1); A penetration rod (2) with its lower end connected to the upper surface of the load plate (1). An articulated section is provided at the upper end of the penetration rod (2), which can achieve a telescopic effect. A pressure sensor (3) is arranged inside the articulated section, and the pressure sensor (3) is used to measure the pressure received at the top of the articulated section; Two support frames (4) erected on both sides of the penetration rod (2). One end of a force application rope (5) is fixedly connected to one of the support frames (4), and a hoisting assembly is arranged on the other support frame (4). The hoisting assembly is connected to the other end of the force application rope (5), and the middle part of the force application rope (5) is used to provide a downward acting force to the top of the articulated section; A measurement assembly for measuring the vertical displacement of the load plate (1); And A control unit electrically connected to the pressure sensor (3) and the measurement assembly.

2. The on-site detection device for railway subgrade compaction according to claim 1, wherein The articulated section includes: Two pressure receiving plates (6) respectively located at the upper and lower ends of the pressure sensor (3). The lower pressure receiving plate (6) is fixedly connected to the upper end of the penetration rod (2); A limiting member for restricting the upward pressure receiving plate (6) from sliding in the vertical direction.

3. The on-site detection device for railway subgrade compaction according to claim 2, wherein, The limiting member is a limiting rod (7) arranged in the vertical direction, and the two pressure receiving plates (6) are respectively slidably connected to the limiting rod (7).

4. The on-site detection device for railway subgrade compaction according to claim 2, characterized in that, A pulley (8) is rotatably connected to the upper surface of the upper pressure receiving plate (6). The upper end of the pulley (8) is frictionally connected to the middle part of the force application rope (5). The force application rope (5) has an inverted "V" - shaped structure, and the angles between the two ends of the force application rope (5) and the horizontal direction are the same.

5. The on-site detection device for railway subgrade compaction according to claim 4, characterized in that, The hoisting assembly includes a driving motor (9) and a speed reducer (10) fixedly connected to the bottom plate of the other support frame (4). The driving motor (9) is electrically connected to the control unit, and the driving motor (9) is drivingly connected to the speed reducer (10). The output shaft of the speed reducer (10) is connected to a hoisting drum (11), and the other end of the force application rope (5) is wound around the hoisting drum (11).

6. The on-site detection device for railway subgrade compaction according to claim 4, characterized in that, The measurement assembly includes: A ranging plate (12) fixedly connected to the outer side wall of the penetration rod (2); A top frame (13) detachably connected to the tops of the two support frames (4). The top frame (13) is located above the pulley (8); and A ranging sensor (14) installed on the top frame (13). The ranging sensor (14) is located directly above the ranging plate (12) and is electrically connected to the control unit. The ranging plate (12) is used to measure the displacement of the ranging plate (12) in the vertical direction.

7. The on-site detection device for railway subgrade compaction according to claim 6, characterized in that, The ranging sensor (14) is a laser ranging sensor, an ultrasonic ranging sensor or an infrared ranging sensor.

8. The on-site detection device for railway subgrade compaction according to claim 1, wherein, The horizontal distance between the support frame (4) and the edge of the load plate (1) is greater than 1 m.

9. The on-site detection device for railway subgrade compaction according to claim 1, characterized in that, A counterweight (15) is arranged on the support frame (4). The counterweight (15) on one of the support frames (4) is fixedly connected to one end of the force application rope (5).

10. The on-site detection device for railway subgrade compaction according to claim 1, wherein, The material of the force application rope (5) is steel wire rope.

Images