Detection device for bearing capacity of roadbed

Abstract

The utility model relates to the technical field of rebound modulus detection, in particular to a roadbed bearing capacity detection device which comprises a bearing plate, a guide rod vertically arranged on the upper portion of the bearing plate and a drop hammer which is arranged on the outer side of the guide rod in a sleeved mode and can slide along the guide rod. The positioning block attracts or releases the drop hammer through the magnetic attraction assembly; the lower portion of the guide rod is sleeved with a load sensor which is fixed to the upper surface of the bearing plate and used for measuring impact load data, and the bearing plate is provided with a displacement sensor used for measuring vertical displacement of the bearing plate. According to the utility model, the drop hammer is sleeved on the periphery of the guide rod and the positioning block for adsorbing and releasing the drop hammer through the magnetic component, the relative height of the positioning block is adjusted according to actual detection requirements, different impact forces are applied to the bearing plate, and the detection of the bearing capacity of the roadbed is realized through the vertical displacement of the bearing plate. The device is simple in structure and convenient to operate, and the detection efficiency of the roadbed bearing capacity is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rebound modulus detection, in particular to a detection device for roadbed bearing capacity. Background Art

[0002] The roadbed is a strip structure built as the foundation of the road surface according to the route location and certain technical requirements. It is the foundation of railways and highways. The roadbed is generally a linear structure built with soil or stone. As the country vigorously develops infrastructure projects, more and more roadbed structures with crack resistance and earthquake resistance are needed to meet people's daily use needs. As the carrier of the pavement structure, the bearing capacity of the roadbed directly affects the service life of the pavement. In the inspection and evaluation of road engineering quality, the roadbed rebound modulus and compaction quality are important indicators for evaluating the quality of the roadbed. How to quickly evaluate the bearing capacity of the roadbed and extend the service life of the road is particularly important.

[0003] However, existing roadbed bearing capacity testing equipment often has a complex structure, is difficult to operate, has low testing efficiency, and cannot flexibly change test conditions according to different test requirements. All of these have greatly affected the usability and applicability of the test equipment. Utility Model Content

[0004] In order to solve at least one of the above technical problems, the utility model proposes a roadbed bearing capacity detection device, which is provided with a drop hammer on the outer periphery of the guide rod and a positioning block that absorbs and releases the drop hammer through a magnetic suction component, and adjusts the relative height of the positioning block according to actual detection needs, applies different impact forces to the bearing plate, and detects the roadbed bearing capacity through the vertical displacement of the bearing plate. The device has a simple structure and is easy to operate, and effectively improves the detection efficiency of the roadbed bearing capacity.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for detecting the bearing capacity of a roadbed comprises a bearing plate, a guide rod vertically arranged on the upper part of the bearing plate, and a drop weight sleeved on the outer side of the guide rod and slidable along the guide rod, the guide rod being located on the upper part of the drop weight and movably sleeved with a positioning block, the positioning block adsorbing or releasing the drop weight through a magnetic suction component; the lower part of the guide rod is sleeved with a load sensor fixed to the upper surface of the bearing plate for measuring impact load data, and the bearing plate is provided with a displacement sensor for measuring the vertical displacement of the bearing plate.

[0007] Preferably, the magnetic attraction component includes a first magnet arranged on the lower surface of the positioning block and a second magnet arranged on the upper surface of the drop weight and attracted to the first magnet.

[0008] Preferably, the first magnet and / or the second magnet is an electromagnet.

[0009] Preferably, the first magnet and the second magnet are respectively embedded and fixed on the lower surface of the positioning block and the upper surface of the drop weight, and the upper surfaces of the first magnet and the second magnet are respectively flush with the lower surface of the positioning block and the upper surface of the drop weight.

[0010] Preferably, the upper portion of the guide rod is provided with positioning screw holes at intervals along the length direction of the guide rod, the positioning block is provided with through holes corresponding to the positioning screw holes, and the positioning block is fixed to the guide rod via a threaded rod.

[0011] Preferably, the threaded rod is provided with a marking section for indicating that the threaded rod is screwed into or out of the positioning screw hole.

[0012] Preferably, a buffer pad is provided on the upper surface of the load sensor.

[0013] Preferably, it also includes a data collector for collecting measurement data of the load sensor and the displacement sensor, and the data collector is connected to the data processing system.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model sets a drop weight on the outer periphery of the guide rod and absorbs and releases the positioning block of the drop weight through a magnetic suction component. According to the actual detection needs, the relative height of the positioning block is adjusted to apply different impact forces to the bearing plate, and the bearing capacity of the roadbed is detected through the vertical displacement of the bearing plate. The device has a simple structure and is easy to operate, which effectively improves the detection efficiency of the roadbed bearing capacity.

[0016] 2. The utility model sets the first magnet and / or the second magnet as an electromagnet, and fixes the drop weight on the lower surface of the positioning screw hole by the adsorption force of the first magnet and the second magnet. By cutting off the power to the electromagnet and eliminating the magnetism, the drop weight falls freely and exerts an impact force on the bearing plate. Then, the vertical displacement of the bearing plate is measured by the displacement sensor, thereby realizing the detection of the bearing capacity of the roadbed.

[0017] 3. The utility model provides positioning marks on the guide rod, which makes it easy for operators to quickly and accurately align the positioning screw holes and the through holes, thereby saving construction time; and provides a marking section on the threaded rod for indicating whether the threaded rod is screwed in or out of the positioning screw hole, which makes it easy for operators to accurately judge the screwing state of the threaded rod according to the marking section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded diagram of the roadbed bearing capacity detection device;

[0019] Figure 2 A three-dimensional diagram of a device for detecting the bearing capacity of a roadbed;

[0020] Figure 3 It is a front view of the device for detecting the bearing capacity of the roadbed;

[0021] Figure 4 This is the right view of the roadbed bearing capacity detection device;

[0022] In the figure: 1. load-bearing plate; 2. guide rod; 21. positioning screw hole; 3. drop weight; 4. positioning block; 41. through hole; 5. load sensor; 6. displacement sensor; 7. magnetic suction assembly; 71. first magnet; 72. second magnet; 8. threaded rod; 9. buffer pad. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention.

[0024] Please refer to Figure 1-4 As shown, a device for detecting the bearing capacity of a roadbed comprises a bearing plate 1, a guide rod 2 vertically arranged on the upper part of the bearing plate 1, and a drop weight 3 sleeved on the outer side of the guide rod 2 and slidable along the guide rod 2, the guide rod 2 is located on the upper part of the drop weight 3 and is movably sleeved with a positioning block 4, and the positioning block 4 absorbs or releases the drop weight 3 through a magnetic suction component 7; a load sensor 5 fixed to the upper surface of the bearing plate 1 for measuring impact load data is sleeved on the lower part of the guide rod 2, and a displacement sensor 6 for measuring the vertical displacement of the bearing plate 1 is provided on the bearing plate 1.

[0025] The utility model determines the bearing capacity of the roadbed based on the PFWD (Portable Falling Weight Deflectometer) method. Specifically, a drop weight 3 is sleeved on the outer periphery of the guide rod 2, and a positioning block 4 of the drop weight 3 is adsorbed and released by a magnetic suction component 7, and the relative height of the positioning block 4 is adjusted according to actual detection needs, so that different impact forces are applied to the bearing plate 1, and the bearing capacity of the roadbed is detected through the vertical displacement of the bearing plate 1. The device has a simple structure and is easy to operate, and effectively improves the detection efficiency of the roadbed bearing capacity.

[0026] It should be noted that in order to improve the measurement accuracy during the test, the bearing plate 1 needs to be placed flat on the surface of the roadbed to be tested. When the roadbed surface is rough, a thin layer of sand can be laid on the surface of the roadbed to be tested to adjust the flatness of the roadbed surface to be tested.

[0027] The load-bearing plate 1, the drop weight 3, the guide rod 2 and the positioning block 4 in the above embodiment are all cylinders of different sizes, and the specific sizes can be selected according to the actual detection needs. Among them, the central axes of the load-bearing plate 1, the drop weight 3, the guide rod 2 and the positioning block 4 coincide with each other, so as to ensure that when the whole device is placed, the whole device will not be unstable due to the rise of the drop weight 3, and at the same time, it can also ensure the uniformity of the impact load formed on the load-bearing plate 1 when the drop weight 3 falls freely.

[0028] In order to facilitate the assembly and transportation of the device, the guide rod 2 and the bearing plate 1 can be fixed together by threaded connection or other detachable methods.

[0029] like Figure 1 As shown, in this embodiment, the positioning block 4 and the drop weight 3 are fixed by adsorption through the magnetic attraction component 7. Specifically, the magnetic attraction component 7 includes a first magnet 71 arranged on the lower surface of the positioning block 4 and a second magnet 72 arranged on the upper surface of the drop weight 3 and adsorbed by the first magnet 71.

[0030] It should be noted that, in order to improve the strength of adsorption and fixation, in actual operation, first magnets 71 and second magnets 72 corresponding to a plurality of positions can be respectively arranged on the lower surface of the positioning block 4 and the upper surface of the drop weight 3 according to actual needs. In this embodiment, two first magnets 71 and second magnets 72 are respectively arranged on the lower surface of the positioning block 4 and the upper surface of the drop weight 3.

[0031] It is understandable that the first magnet 71 and the second magnet 72 can be arranged on the lower surface of the positioning block 4 and the upper surface of the drop weight 3 by embedding. In order to reduce the mutual force between the positioning block 4 and the drop weight 3 when they are adsorbed, the surfaces of the first magnet 71 and the second magnet 72 are flush with the lower surface of the positioning block 4 and the upper surface of the drop weight 3, respectively.

[0032] Considering that during the detection process of the device, the positioning block 4 needs to absorb the drop hammer 3 and release it from a certain height, in order to facilitate the operation of absorption and release, the first magnet 71 and / or the second magnet 72 in this embodiment are electromagnets. Specifically, during absorption, the first magnet 71 and / or the second magnet 72 are energized, and the drop hammer 3 is absorbed and fixed on the lower surface of the positioning block 4 through the mutual attraction of the first magnet 71 and the second magnet 72; during detection, the first magnet 71 or the second magnet 72 is powered off, and the first magnet 71 or the second magnet 72 loses its magnetism, so that the drop hammer 3 contacts the upper surface of the supporting plate 1 under the guidance of the guide rod 2, forming an impact load, thereby causing the supporting plate 1 to undergo vertical displacement.

[0033] In order to avoid damage to the falling weight 3 and the bearing plate 1 caused by direct rigid contact between the falling weight 3 and the bearing plate 1, in this embodiment, a buffer pad 9 is provided on the upper surface of the load sensor 5. The buffer pad 9 can be fixed by bonding or other fixing methods.

[0034] like Figure 1 and 3 As shown, positioning screw holes 21 are provided at intervals on the upper part of the guide rod 2 along the length direction of the guide rod 2 , and the positioning block 4 is provided with through holes 41 corresponding to the positioning screw holes 21 . The positioning block 4 is fixed to the guide rod 2 via a threaded rod 8 .

[0035] It can be understood that since the drop hammer 3 generates an impact load on the load-bearing plate 1 by free fall, in order to provide different impact loads, the positioning block 4 can be fixed to the guide rod 2 through positioning screw holes 21 of different heights, thereby adjusting the relative distance between the positioning block 4 and the load-bearing plate 1, so that the relative height difference between the drop hammer 3 and the load-bearing plate 1 is changed, thereby achieving the adjustment of different impact loads.

[0036] In order to conveniently indicate whether the threaded rod 8 is screwed into or out of the positioning screw hole 21 , the threaded rod 8 is provided with a marking section (not shown in the figure).

[0037] Specifically, the length of the marking section should be equal to the diameter of the guide rod 2, and the marking section should be set in the middle section of the threaded rod 8, and the length of the front section of the thread should be equal to the length of the through hole 41 on one side of the positioning block 4. In this way, when the threaded rod 8 is screwed into the marking section, the front end of the threaded rod 8 just enters the positioning screw hole 21; when the marking section is completely screwed into the interior of the positioning block 4, the front end of the threaded rod 8 just leaves the positioning screw hole 21. In order to improve the stability of the positioning block 4, the threaded rod 8 can be screwed in a part as needed.

[0038] In this embodiment, the detection data of the load sensor 5 and the displacement sensor 6 can be collected by a data collector and transmitted to a data processing system by wired or wireless means. Among them, the data processing system includes a data transmission module, a data calculation module and a terminal. The terminal can use a mobile terminal to facilitate real-time understanding of the detection results. The data transmission module is used to transmit the data collected by the data collector to the data calculation module. The data calculation module calculates the dynamic rebound modulus of the roadbed according to the peak values ​​of pressure and displacement using the Bussineske theory formula of the elastic half space, and displays the result on the terminal. Among them, the working principles of the above-mentioned load sensor 5, displacement sensor 6, data collector and data processing system belong to the prior art, and this application will not repeat them here.

[0039] The working process of this device is as follows:

[0040] The device is placed on the surface of the roadbed to be tested through the bearing plate 1. If necessary, the contact between the bearing plate 1 and the surface of the roadbed to be tested needs to be checked. When the surface of the roadbed is rough, a thin layer of sand can be laid under the bearing plate 1 to fill the roadbed and ensure that the bearing plate 1 can be in stable contact with the surface of the roadbed.

[0041] Before testing, check the positioning accuracy of the monitoring points and the firmness of the connections of the various components of the device to ensure the reliability and accuracy of the test data.

[0042] During the inspection, the drop weight 3 is first pulled upward to the upper half of the guide rod 2 by a lifting device, and the first magnet 71 is started. Since the magnetic properties of the first magnet 71 and the second magnet 72 on the side close to each other are opposite, the drop weight 3 is adsorbed and fixed on the lower surface of the positioning block 4 under the action of suction.

[0043] When it is necessary to apply an impact force to the bearing plate 1, the first magnet 71 is turned off, the first magnet 71 loses its magnetism, and the magnetic attraction between the first magnet 71 and the second magnet 72 disappears, and the drop weight 3 slides freely downward along the guide rod 2, forming an impact load on the bearing plate 1, so that the bearing plate 1 will be vertically displaced. The corresponding data of the load sensor 5 and the displacement sensor 6 collected by the data collector are analyzed by the data processing system, so as to realize the evaluation of the bearing capacity of the roadbed.

[0044] It should be noted that the size of the impact load can be adjusted by adjusting the height between the positioning block 4 and the load-bearing plate 1. It can also be achieved by replacing the drop weight 3 of different weights. Specifically, the threaded rod 8 is screwed out, and the positioning block 4 and the drop weight 3 are removed from the upper part of the guide rod 2 in sequence, and then a suitable drop weight 3 is installed on the bottom of the guide rod 2 by hoisting, and the positioning block 4 is fixed to the guide rod 2 by selecting a suitable positioning screw hole 21 through the threaded rod 8.

[0045] The above is a specific implementation of the embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the scope of protection of this application.

Claims

1. A device for detecting the bearing capacity of a roadbed, comprising a bearing plate (1), a guide rod (2) vertically arranged on the upper part of the bearing plate (1), and a drop weight (3) sleeved on the outer side of the guide rod (2) and capable of sliding along the guide rod (2), characterized in that: The guide rod (2) is movably sleeved on the upper part of the drop weight (3) and is provided with a positioning block (4), and the positioning block (4) absorbs or releases the drop weight (3) through a magnetic attraction component (7); the lower part of the guide rod (2) is sleeved with a load sensor (5) fixed to the upper surface of the bearing plate (1) for measuring impact load data, and the bearing plate (1) is provided with a displacement sensor (6) for measuring the vertical displacement of the bearing plate (1).

2. The device for detecting the bearing capacity of the roadbed according to claim 1, characterized in that: The magnetic attraction component (7) comprises a first magnet (71) arranged on the lower surface of the positioning block (4) and a second magnet (72) arranged on the upper surface of the drop weight (3) and attracted to the first magnet (71).

3. The device for detecting the bearing capacity of the roadbed according to claim 2, characterized in that: The first magnet (71) and / or the second magnet (72) are electromagnets.

4. The device for detecting the bearing capacity of the roadbed according to claim 2, characterized in that: The first magnet (71) and the second magnet (72) are respectively embedded and fixed on the lower surface of the positioning block (4) and the upper surface of the drop weight (3); the upper surfaces of the first magnet (71) and the second magnet (72) are respectively flush with the lower surface of the positioning block (4) and the upper surface of the drop weight (3).

5. The device for detecting the bearing capacity of roadbed according to claim 1, characterized in that: The upper part of the guide rod (2) is provided with positioning screw holes (21) at intervals along the length direction of the guide rod (2), the positioning block (4) is provided with through holes (41) corresponding to the positioning screw holes (21), and the positioning block (4) is fixed to the guide rod (2) via a threaded rod (8).

6. The device for detecting the bearing capacity of roadbed according to claim 5, characterized in that: The threaded rod (8) is provided with a marking section for indicating that the threaded rod (8) is screwed into or out of the positioning screw hole (21).

7. The device for detecting the bearing capacity of the roadbed according to any one of claims 1 to 6, characterized in that: A buffer pad (9) is provided on the upper surface of the load sensor (5).

8. The device for detecting the bearing capacity of roadbed according to claim 7, characterized in that: It also includes a data collector for collecting measurement data of the load sensor (5) and the displacement sensor (6), and the data collector is connected to the data processing system.

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