Bridge dynamic and static load displacement measuring device

Abstract

The utility model provides a measuring device for dynamic and static load displacement of a bridge, which comprises a displacement conduction rod assembly, an elastic compression assembly, a pressure sensor and a bearing table assembly which are sequentially stacked from top to bottom, the top end of the displacement conduction rod assembly abuts against the bridge to be tested, and the pressure sensor is arranged on the bearing table assembly. The elastic compression assembly is arranged between the lower end of the displacement conduction rod assembly and the upper end of the pressure sensor in an elastic compression mode. The measuring device for the dynamic and static load displacement of the bridge is very simple in structure, the cost of each structure is very low, the high-clearance bridge dynamic and static load displacement test can be realized without erecting a high support frame, and high-altitude operation is also not needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering detection field especially, it is used for bridge dynamic, static load displacement measurement's device. BACKGROUND

[0002] Bridge is the important infrastructure of city, its operating condition is closely related with people's life quality, social economic development, therefore, it is very important to carry out maintenance detection work to bridge, bridge maintenance is the important measure of ensuring bridge quality and safety, its primary goal is to maintain bridge regularly, and timely discovers and repairs the defect existing, through adopting comprehensive measure, carries out early disease prevention to bridge, handles in time the damage that can cause, enhances its anti-disaster ability, reduces maintenance and operation cost.

[0003] The most commonly used displacement measuring instrument in bridge testing is a dial gauge, a dial gauge and a deflection meter, etc. These instruments can conveniently and directly measure the structure. However, the use of these instruments usually requires a relatively stationary support structure to bear one end of the instrument, and the other end of the instrument abuts the bridge. This requires the height of the support structure to be arranged according to the clearance of the bridge. For high-clearance bridges, the support structure also needs to be adaptively set to a higher height. At the same time, based on the need for stability, the support structure needs to have a larger diameter, which makes the disassembly, assembly and transportation of the support structure very troublesome. The installation and adjustment of the instrument need to be carried out at a high altitude, and the high clearance makes the reading of the instrument a problem. Although there are some electronic displacement measuring instruments to replace them, the installation, disassembly or adjustment of the instrument during testing due to loosening or skewing must be carried out at a high altitude. Therefore, these instruments are usually used in situations where the clearance is not high and it is convenient to set up a support structure. The dynamic and static load displacement of relatively high-clearance bridges may require optical or photoelectric equipment (such as a total station) to handle. However, optical or photoelectric equipment is usually expensive and has high maintenance costs. Therefore, there is an urgent need for a displacement measuring device that is simple in structure, low in cost and suitable for relatively high-clearance bridges. SUMMARY

[0004] Based on the above technical problems existing in the prior art, the utility model provides a kind of measuring device for bridge dynamic, static load displacement, comprising: displacement conducting rod assembly, elastic compression component, pressure sensor and bearing table assembly are sequentially stacked from top to bottom, the top end of displacement conducting rod assembly is abutted to the bridge to be tested, pressure sensor is placed on bearing table assembly, elastic compression component is arranged between the lower end of displacement conducting rod assembly and the upper end of pressure sensor by elastic compression.

[0005] Displacement conducting rod assembly one end is abutted to the bridge to be tested, the displacement of bridge after being loaded can be conducted downwards by displacement conducting rod assembly, whereby the elastic compression component of the other end of displacement conducting rod assembly is compressed, and the change of the compressed amount of elastic compression component can be converted into the pressure change of pressure sensor. Therefore, during actual measurement, the change of the compressed amount of elastic compression component, i.e. the displacement change of bridge, can be corresponded by detecting the pressure change of pressure sensor.

[0006] The measuring device for bridge dynamic, static load displacement of the utility model is very simple in structure, and the cost of each structure is also very low, and it can realize dynamic, static load displacement test of bridge with high clearance without setting up high support frame, and high-altitude operation is not needed. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is the test principle schematic view of the bridge dynamic, static load displacement measuring device of the utility model

[0008] Figure 2 It is the schematic view of the bridge dynamic, static load displacement measuring device of the utility model

[0009] Figure 3 It is the schematic view for dynamic load (bump test) displacement measurement of the utility model DETAILED DESCRIPTION

[0010] The utility model will be further explained in detail in combination with examples:

[0011] Reference Figure 1 It shows the principle schematic view of the utility model actually in use, Figure 1 A is assembled before loading, and it needs to be explained that elastic compression component 2 is in compressed state (assuming compression amount is Δx), so as to overcome the weight of displacement conducting rod assembly 1 and abut displacement conducting rod assembly 1 to bridge 100 to be tested.Pressure sensor 3 is placed between elastic compression component 2 and bearing table assembly 4, and it can be understood that bearing table assembly 4 can be riverbed, ground or support frame placed on riverbed or ground, etc. as long as any way can provide a fixed bearing surface.According to Hooke's law, bridge displacement amount before loading is defined as 0, and at this time, pressure sensor 3 senses that actual pressure is F0=kΔx.When bridge 100 is loaded (seeFigure 1 B) when a displacement Ah is generated, the displacement transmission rod assembly 1 converts the displacement Ah into a further compression amount of the elastic compression assembly 2, at this time the pressure sensor 3 senses that the actual pressure is F1=k(Ax+Ah). Therefore, the bridge loading (dynamic or static load) displacement can be determined by monitoring the pressure value sensed by the pressure sensor 3. It should be noted that the elastic compression assembly 2 can not fully comply with Hooke's law, as long as the displacement value and the sensed pressure value can be one-to-one corresponding, which can be calibrated before the experiment, and the calibration value is recorded (for example, saved in the computer system), and the displacement value corresponding to the sensed pressure value is queried based on the above record during measurement.

[0012] Therefore, the displacement measuring device for dynamic or static load test of the bridge 100 can be provided, which comprises the displacement transmission rod assembly 1, the elastic compression assembly 2, the pressure sensor 3 and the bearing table assembly 4 which are stacked in sequence from top to bottom, the top end of the displacement transmission rod assembly 1 abuts the bridge 100 to be tested, the pressure sensor 3 is arranged on the bearing table assembly 4, and the elastic compression assembly 2 is arranged between the lower end of the displacement transmission rod assembly 1 and the upper end of the pressure sensor 3 in an elastically compressed manner.

[0013] The following is Figure 2 In a preferred embodiment, the displacement transmission rod assembly 1 comprises at least two transmission rods 11 connected in series, and adjacent transmission rods 11 are fixedly connected by a connecting sleeve 12. In this way, a suitable number of transmission rods 11 can be selected according to different bridge clearances.

[0014] In another embodiment, the displacement transmission rod assembly 1 comprises an anti-skid seat 13 at the top end, the anti-skid seat 13 is fixedly connected to the top end of the topmost transmission rod 11, and the anti-skid seat 13 has a larger equivalent diameter than the transmission rod 11. In this way, the abutting reliability of the displacement transmission rod assembly 1 and the bridge 100 can be avoided. Further preferably, a plurality of teeth are arranged on the upper end surface of the anti-skid seat 13 or a suction cup is arranged on the anti-skid seat 13, the teeth can further inhibit the sliding of the top of the displacement transmission rod assembly 1 on the bridge bottom surface, and the suction cup has a similar effect, but the bridge bottom surface can not be flat, so some grease-like substances for sealing can be applied in the suction cup.

[0015] In another embodiment, the elastic compression assembly 2 comprises an upper spring seat 21, a lower spring seat 22 and at least one spring 23 arranged between the upper spring seat 21 and the lower spring seat 22. Figure 2The spring seat 21 and the spring seat 22 are vertically slidably sleeved on the slide rods 24, and lower ends of the slide rods 24 are fixedly connected to the bearing platform assembly 4. The slide rods and the spring grooves are arranged, and the spring can only be vertically stretched and contracted, thereby reducing the risk of longitudinal deviation or even disengagement of the spring caused by non-absolute vertical force, especially during dynamic load testing.

[0016] Further, the upper end surface of the spring seat 21 is provided with a transmission rod groove for coupling and fixing the lower end of the displacement transmission rod assembly 1. Inserting the lower end of the displacement transmission rod assembly 1 into the groove can inhibit the shaking of the displacement transmission rod assembly 1, thereby improving reliability.

[0017] In another embodiment, the lower end surface of the spring seat 22 is provided with a first sensor groove for coupling the pressure sensor 3. Thus, the pressure sensor 3 is fixed in the horizontal direction.

[0018] In another embodiment, the bearing platform assembly 4 includes a bearing platform surface 41, a base 42, and a lifting mechanism 43 arranged between the bearing platform surface 41 and the base 42, and the bearing platform surface 41 is provided with a second sensor groove for receiving the pressure sensor 3. The second sensor groove is similar to the first sensor groove and can be used for fixing the pressure sensor 3. The lifting mechanism 43 can give the testing device more flexibility. For example, if there is no lifting mechanism 43, although a suitable number of transmission rods 11 can be selected to adapt to the bridge clearance, it is usually difficult to perfectly match the height, which requires the bearing platform assembly 4 to be raised or lowered by piling up or digging, especially considering that the elastic compression assembly 2 needs to be in a compressed state when the testing device is installed, and it becomes more difficult to operate the bearing platform assembly 4 by piling up or digging.

[0019] In another embodiment, the displacement transmission rod assembly 1 includes at least two serially connected transmission rods 11, adjacent transmission rods 11 are fixedly connected by a connecting sleeve 12, at least one transmission rod 11 has a length of 2L, and at least one transmission rod 11 has a length of L; the bearing platform assembly 4 includes a bearing platform surface 41, a base 42, and a lifting mechanism 43 arranged between the bearing platform surface 41 and the base 42, and the lifting mechanism 43 can adjust the height of the bearing platform surface 41 in a range of 2n-1L-2nL, n is a positive integer in a range of 1-5. For example, the transmission rod 11 includes a 1-meter transmission rod and a 2-meter transmission rod, and the lifting mechanism 43 can adjust the height of the bearing platform surface 41 in a range of 1-2 meters. In this way, the bridge testing of any clearance above 2 meters (not considering the height of the elastic compression assembly 2) can be adapted.

[0020] In another embodiment, a controller is also included, which is electrically connected to the pressure sensor. The controller can be a computer, a tablet, a mobile phone, etc., to collect and record the pressure values of the sensor, and can be further directly converted into displacement values.

[0021] Figure 3 It is shown that the testing device of the utility model is used for conventional jump vehicle dynamic load test, mainly is let the car start on the jump board of for example 50 centimeters height, thereby analyzes various load data of bridge. Of course, it can be understood that the testing device of the utility model is also applicable to static load test.

[0022] In use, the bearing table assembly 4 is placed on the ground or riverbed area below the test point and leveled, the pressure sensor 3 and the elastic compression assembly 2 are arranged on the bearing table assembly 4, a suitable number of conducting rods 11 are connected in series, the top end of the conducting rod 11 abuts against the bridge 100, the conducting rod 11 is adjusted to be basically vertical, the lower end of the conducting rod 11 is inserted into the elastic compression assembly 2, the lifting mechanism 43 is controlled to lift, the elastic compression assembly 2 is compressed enough to abut against the conducting rod 11 to the bridge 100. The initial reading of the pressure sensor 3 is detected, the bridge is loaded (movable load, also static load), and the sensing value of the pressure sensor 3 is collected.

[0023] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A displacement measuring device for dynamic or static load testing of a bridge (100), characterized in that, Comprise: A displacement conducting rod assembly (1), an elastic compression assembly (2), a pressure sensor (3) and a bearing table assembly (4) are sequentially stacked from top to bottom, the top end of the displacement conducting rod assembly (1) abuts the bridge (100) to be tested, the pressure sensor (3) is placed on the bearing table assembly (4), and the elastic compression assembly (2) is elastically compressed and arranged between the lower end of the displacement conducting rod assembly (1) and the upper end of the pressure sensor (3).

2. The displacement measuring device for dynamic or static load testing of a bridge (100) according to claim 1, characterized in that: The displacement conducting rod assembly (1) comprises at least two series-connected conducting rods (11), and adjacent conducting rods (11) are fixedly connected by a connecting sleeve (12).

3. The displacement measuring device for dynamic or static load testing of a bridge (100) according to claim 2, characterized in that: The displacement conducting rod assembly (1) comprises an anti-skid seat (13) at the top end, the anti-skid seat (13) is fixedly connected to the top end of the topmost conducting rod (11), and the anti-skid seat (13) has a larger equivalent diameter than the conducting rod (11).

4. The displacement measuring device for dynamic or static load testing of a bridge (100) according to claim 3, characterized in that: A plurality of teeth are arranged on the upper end surface of the anti-skid seat (13), or a suction cup is arranged on the anti-skid seat (13).

5. The displacement measuring device for dynamic or static load testing of a bridge (100) as claimed in claim 1, wherein: The elastic compression assembly (2) comprises an upper spring seat (21), a lower spring seat (22), at least one spring (23) arranged between the upper spring seat (21) and the lower spring seat (22), and at least two slide rods (24), the lower end surface of the upper spring seat (21) and the upper end surface of the lower spring seat (22) are each provided with a corresponding number of spring grooves that can be coupled with the at least one spring (23), the upper spring seat (21) and the lower spring seat (22) are sleeved on the at least two slide rods (24) in a vertical sliding manner, and the lower ends of the at least two slide rods (24) are fixedly connected to the bearing table assembly (4).

6. The displacement measuring device for dynamic or static load testing of a bridge (100) according to claim 5, characterized in that: The upper end surface of the upper spring seat (21) is provided with a transmission rod groove for coupling and fixing the lower end of the displacement conducting rod assembly (1).

7. The displacement measuring device for dynamic or static load testing of a bridge (100) according to claim 5, characterized in that: The lower end surface of the lower spring seat (22) is provided with a first sensor groove for coupling the pressure sensor (3).

8. The displacement measuring device for dynamic or static load testing of a bridge (100) as claimed in claim 1, wherein: The bearing table assembly (4) comprises a bearing table surface (41), a base (42), and a lifting mechanism (43) arranged between the bearing table surface (41) and the base (42), and the bearing table surface (41) has a second sensor groove for receiving the pressure sensor (3).

9. The displacement measuring device for dynamic or static load test of a bridge (100) according to any one of claims 1-8, characterized in that: The displacement conducting rod assembly (1) comprises at least two series-connected conducting rods (11), and adjacent conducting rods (11) are fixedly connected by a connecting sleeve (12), wherein at least one conducting rod (11) has a length of 2L, and at least one conducting rod (11) has a length of L; The bearing table assembly (4) comprises a bearing table surface (41), a base (42), and a lifting mechanism (43) arranged between the bearing table surface (41) and the base (42), and the lifting mechanism (43) can adjust the height of the bearing table surface (41) in a range of (2n-1)L~2nL, n is a positive integer in a range of 1-5.

10. The displacement measuring device for dynamic or static load testing of a bridge (100) according to any one of claims 1-8, characterized in that: Further comprising a controller electrically connected to the pressure sensor.

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