Single-column pier bridge displacement testing device

Abstract

The utility model discloses a single-column pier bridge displacement testing device, belongs to the technical field of bridge detection, and aims to solve the problems of many interference factors and low accuracy in bridge deflection measurement. The device comprises a steel wire rope arranged below a bridge, a horizontal plate is connected to the bottom of the steel wire rope, a dial indicator is arranged on the horizontal plate, the horizontal plate penetrates through a set of vertical sliding shafts, each sliding shaft is provided with a linear bearing and a bottom limiting stopper from top to bottom, the upper portion of each linear bearing penetrates out of the horizontal plate, and the lower portion of each linear bearing is clamped at the bottom of the horizontal plate; a balancing weight is movably arranged in the center of the bottom of the horizontal plate; the balancing weight and the center of gravity of the steel wire rope are on the same vertical line; one side of the horizontal plate is provided with an extension plate, the extension plate is provided with a dial indicator installation hole, and the dial indicator is installed in the dial indicator installation hole and is fixed through a dial indicator fastener. And the practicability in the field test is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge detection technical field, concretely relates to a single column pier bridge displacement testing arrangement. BACKGROUND

[0002] In recent years, along with the rapid development of traffic infrastructure, the number of highway bridges increases rapidly, and the overall quality level has also made continuous breakthroughs. But with the increase of traffic density and vehicle load, some bridges have not met the use requirements, among many factors affecting the health and safety of bridges and directly reflecting the vertical stiffness of bridge structure, bridge deflection becomes the most critical factor, and is also an important index to evaluate the service condition of bridges.

[0003] At present, there are many methods for measuring bridge deflection at home and abroad, such as precise leveling method, total station measurement method, photoelectric deflection instrument, etc., but due to the limitations of cost, on-site traffic conditions, terrain illumination and other environmental factors, there is no equipment that can measure bridge deflection under various conditions.

[0004] At present, the commonly used detection method in the field is to hang a steel wire under the beam, the steel wire is connected with the support anchored on the ground through a spring, or connected with a counterweight, and the bridge deflection is calculated by the travel of the dial gauge and the steel wire in the vertical direction, but this equipment has the following shortcomings in the field:

[0005] 1. Although it is a low pier highway bridge, the bridge is still a certain distance from the ground, and the fixing method of the steel wire beam is very easy to swing in the wind, which has a great influence on the accuracy and precision of bridge deflection measurement. Especially in the northwest region, the field is windy and the wind is unstable, it is difficult to correct with compensation index. At the same time, the spring is also poor in stability, and the wind acting on the spring will also affect the stability and accuracy of the dial gauge, the above two flexible structures are greatly affected by the wind, which leads to the fact that the measurement result cannot be accurately obtained.

[0006] 2. The counterweight is generally anchored on the ground on site, or large stones, concrete blocks, etc. are used, which can be realized if it is a flat ground, but if it is a river or a low-lying beach under the bridge, it is difficult to adjust the spring to be equally stressed at both ends, which affects the accurate reading of the dial gauge.

[0007] 3. In theory, two indicators consistent with the spring should have the same deformation, but in actual operation, even if the same manufacturer, the same batch of springs, the deformation is different under the same load, even if the middle of a spring load, the deformation of both ends cannot be the same, which leads to the steel beam connected to the bridge by the steel wire in the actual operation cannot be kept horizontal. For example, the scheme disclosed in CN105716511A Bridge Static Load Test Deflection Dial Gauge Measuring Connection Device, in the measurement site of the northwest windy area, the steel beam 3 is deformed by the wind and the two springs 5, and under the load standard, the leveling of the steel beam 3 cannot be achieved. The horizontal state of the steel beam 3 will directly affect the deflection calculation value.

[0008] Based on the problems in the above background technology, the on-site measurement personnel proposes a single-column pier bridge displacement testing device to cope with the variable and complex on-site testing environment and improve the adaptability of the equipment. Practical new type content

[0009] The purpose of the present application is to provide a single-column pier bridge displacement testing device and method to solve the problem of multiple interference factors and low accuracy in bridge deflection measurement.

[0010] In order to solve the above problems, the technical scheme of the present application is:

[0011] A single-column pier bridge displacement testing device, comprising a steel wire rope arranged below the bridge, a horizontal plate connected to the bottom of the steel wire rope, a dial gauge arranged on the horizontal plate, a group of vertical sliding shafts, a linear bearing and a bottom limiter arranged on each sliding shaft from top to bottom, the upper part of the linear bearing penetrating the horizontal plate, and the lower part clamped to the bottom of the horizontal plate; a counterweight block movably arranged at the center of the bottom of the horizontal plate, the counterweight block and the gravity center of the steel wire rope being on the same vertical line; an extension plate arranged on one side of the horizontal plate, a dial gauge mounting hole being formed in the extension plate, and the dial gauge being mounted in the dial gauge mounting hole and fixed by a dial gauge fastener.

[0012] Further, a door-shaped support is arranged at the bottom of the horizontal plate, a counterweight rod movably arranged on the door-shaped support, and the counterweight block movably arranged on the counterweight rod; the counterweight block is movably arranged to facilitate step-by-step loading.

[0013] Further, a wire locker is arranged on the horizontal plate, the steel wire rope is mounted in the wire locker, and the wire locker and the counterweight rod are on the same vertical line; so as to ensure that the counterweight block and the gravity center of the steel wire rope are on the same vertical line, thereby ensuring the accuracy of the measurement value.

[0014] Further, a top limiter is arranged above the linear bearing on the sliding shaft; to prevent novices from overloading during on-site debugging.

[0015] Further, the sliding shaft is provided with a top plate limiter, the top plate limiter is located between the linear bearing and the bottom limiter, one side of the top plate limiter is provided with a fastener top plate, and the top of the fastener top plate is abutted against the bottom of the dial gauge fastener; the position of the dial gauge is ensured to be in a normal state during the whole test process.

[0016] Further, the horizontal plate is provided with at least two horizontal bubbles; and the horizontal bubbles are used for leveling.

[0017] Further, the bottom limiter is connected with a base at the bottom, so as to be conveniently erected on a surveying and mapping tripod.

[0018] The beneficial effects of the utility model are as follows:

[0019] (1) the utility model discloses a method for transmitting the vertical deflection of a bridge to a horizontal plate through the sliding of a linear bearing on a sliding shaft and the cooperation of a steel wire rope load, and then the vertical deflection of the bridge is measured by an electronic dial gauge installed in a dial gauge mounting hole, thereby solving the deflection loss and error problem of a traditional flexible test equipment caused by environment, weather and other factors in the bridge deflection measurement process.

[0020] After the device is erected on a surveying and mapping special triangular support, the water level bubble can further adjust the whole equipment, so that the equipment can be measured under vertical and horizontal conditions, and the accuracy of measurement data is improved.

[0021] (2) the utility model discloses a device structure that is finally determined after multiple optimization improvements on the basis of multiple on-site measurements and repeated tests, and the device structure is simple, easy to operate, has high accuracy for bridge deflection measurement, has better adaptability to detection environment and terrain, and has stronger practicality in on-site testing. DRAWINGS

[0022] Figure 1 It is a structure schematic view of a single-column pier bridge displacement test device;

[0023] Figure 2 It is a structure schematic view of a sliding rail connecting plate in a single-column pier bridge displacement test device;

[0024] Figure 3 It is a structure schematic view of a linear bearing in a single-column pier bridge displacement test device;

[0025] Figure 4 It is a working state schematic view of a single-column pier bridge displacement test device.

[0026] The attached diagram is labeled as follows: 1-Horizontal plate; 11-Extension plate; 12-Dial indicator fastener; 13-Fastener top plate; 14-Top plate limiter; 15-Level bubble; 2-Dial indicator mounting hole; 3-Sliding shaft; 31-Linear bearing; 32-Top limiter; 33-Bottom limiter; 34-Base; 4-Counterweight; 41-Counterweight rod; 42-Gantry bracket; 43-Cable locking device; 5-Wire rope. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0029] Example 1

[0030] like Figures 1-3 As shown, a displacement testing device for a single-column pier bridge includes a horizontal plate 1, a dial indicator, a sliding shaft 3, a counterweight 4, and a steel wire rope 5.

[0031] The specific locations and connections are as follows:

[0032] A horizontal plate 1 is mounted on a set of vertical sliding shafts 3. Each sliding shaft 3 is provided with a top limiter 32, a linear bearing 31, a bottom limiter 33, and a base 34 from top to bottom. The upper part of the linear bearing 31 extends out of the horizontal plate 1, and the lower part is locked at the bottom of the horizontal plate 1. The top limiter 32 and the bottom limiter 33 restrict the upward and downward sliding trajectory of the linear bearing 31 on the sliding shaft 3, thereby limiting the range of vertical movement of the horizontal plate 1, or the range of unilateral lifting on the left and right sides. In conjunction with the multiple leveling bubbles 15 provided on the horizontal plate 1, the overall installation and leveling of the device can be achieved.

[0033] The horizontal plate 1 is provided with an extension plate 11 on one side, a dial gauge mounting hole 2 is formed in the extension plate 11, the dial gauge is mounted in the dial gauge mounting hole 2 and is fixed by a dial gauge fastener 12. In order to ensure the stability of the dial gauge, the dial gauge is further clamped by a related structure, and the structure is specifically located as follows: a top plate limiter 14 is arranged on the sliding shaft 3, the top plate limiter 14 is located between the linear bearing 31 and a bottom limiter 33, and a fastener top plate 13 is arranged on one side of the top plate limiter 14, and the fastener top plate 13 is abutted against the bottom of the dial gauge fastener 12.

[0034] The horizontal plate 1 is provided with a door-shaped support 42 at the bottom, a counterweight rod 41 is movably arranged on the door-shaped support 42, and the counterweight block 4 is movably arranged on the counterweight rod 41.

[0035] The horizontal plate 1 is connected with the bottom of the bridge through a steel wire rope 5, and specifically, a wire locker 43 is arranged on the horizontal plate 1, the steel wire rope 5 is arranged in the wire locker 43, and the wire locker 43 is located on the same vertical line as the counterweight rod 41, so that the gravity centers of the counterweight block 4 and the steel wire rope 5 are located on the same vertical line.

[0036] The working principle is as follows Figure 4 The horizontal plate 1 is deformed along with the bridge, and the dial gauge arranged on the horizontal plate 1 can reflect the deformation amount of the bridge under the load, and the vertical deflection of the bridge is calculated through displacement deformation.

[0037] Specifically, the method for measuring the deflection of a low-pier highway bridge by using the device comprises the following steps:

[0038] Step S1, preparation and equipment installation;

[0039] The device is arranged on a special tripod for surveying and mapping, the steel wire rope 5 is hung at the measuring position of the beam bottom of the to-be-measured low-pier highway bridge, a lead sinker is hung at the bottom end of the steel wire rope 5, the wire inlet of the wire locker 43 is aligned with the tip of the lead sinker after the lead sinker is stable, and the device is fixed as a whole at this time.

[0040] The leveling device is observed by observing a plurality of level bubbles 15 arranged on the horizontal plate 1.

[0041] The lead sinker is removed, the position is kept unchanged, the steel wire rope 5 is locked in the wire locker 43.

[0042] The position of the locking can be adjusted according to the distance between the extension plate 11 and the fastener top plate 13 according to the length of the dial gauge pointer, so that the dial gauge is fastened and in the effective range.

[0043] Step S2, load measurement;

[0044] After preparation, collect initial readings without other loads on the bridge deck.

[0045] Different weights are replaced to achieve step loading, and the specific loading weight is determined according to the calculated load condition.

[0046] After each weight loading, the weight rod 41 and the door-shaped support 42 are used to conduct the load to the horizontal plate 1, and then the load is applied to the measuring position of the beam bottom of the low pier highway bridge through the steel wire rope 5. At this time, the deformation of the horizontal plate 1 can reflect the deformation of the measuring position of the beam bottom. At this time, the extension plate 11 connected with the horizontal plate 1 also deforms, and the deformation amount is collected by the dial gauge installed in the dial gauge mounting hole 2.

[0047] After the above data collection, the data is automatically input into the computer, and the data of each step loading weight and the dial gauge reading are saved.

[0048] After the last step of loading is completed, the unloading readings are collected.

[0049] Step S2, result calculation;

[0050] According to the obtained parameters, the displacement of the measuring point and the relative residual displacement of the measuring point can be obtained according to the formula in the prior art, and finally the deflection is calculated.

[0051] It should be noted that the specific type and specification of the dial gauge, linear bearing and the like are determined according to the actual specification of the device, and the specific selection calculation method adopts the existing technology in the art, so it will not be described in detail.

Claims

1. A single column pier bridge displacement testing device, comprising a steel wire rope (5) arranged below the bridge, a horizontal plate (1) connected at the bottom of the steel wire rope (5), and a dial gauge arranged on the horizontal plate, characterized in that: The horizontal plate (1) is arranged on a group of vertical sliding shafts (3), each sliding shaft (3) is respectively provided with a linear bearing (31) and a bottom limiter (33) from top to bottom, the upper part of the linear bearing (31) penetrates the horizontal plate (1), and the lower part is clamped on the bottom of the horizontal plate (1); a counterweight block (4) is movably arranged at the center of the bottom of the horizontal plate (1), the counterweight block (4) and the gravity center of the steel wire rope (5) are on the same vertical line; an extension plate (11) is arranged on one side of the horizontal plate (1), a dial gauge mounting hole (2) is formed in the extension plate (11), a dial gauge is mounted in the dial gauge mounting hole (2) and fixed by a dial gauge fastener (12).

2. The single column pier bridge displacement testing device of claim 1, wherein: The bottom of the horizontal plate (1) is provided with a door-shaped support (42), and the door-shaped support (42) is movably provided with a counterweight rod (41), and the counterweight block (4) is movably arranged on the counterweight rod (41).

3. A single column pier bridge displacement testing device as claimed in claim 1 or 2, characterized in that: The horizontal plate (1) is provided with a wire locker (43), the steel wire rope (5) is mounted in the wire locker (43), and the wire locker (43) and the counterweight rod (41) are on the same vertical line.

4. The single column pier bridge displacement testing device of claim 3, wherein: The linear bearing (31) is provided with a top limiter (32) above the sliding shaft (3).

5. The single column pier bridge displacement testing device of claim 1, wherein: The sliding shaft (3) is provided with a top plate limiter (14), the top plate limiter (14) is located between the linear bearing (31) and the bottom limiter (33), one side of the top plate limiter (14) is provided with a fastener top plate (13), and the bottom of the fastener top plate (13) abuts against the bottom of the dial gauge fastener (12).

6. The single column pier bridge displacement testing device of claim 1, wherein: The horizontal plate (1) is provided with at least two horizontal bubbles (15).

7. The single column pier bridge displacement testing device of claim 1, wherein: The bottom of the bottom limiter (33) is connected with a base (34).

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