CN105928447A - Rapid bridge flexibility measuring device - Google Patents

Abstract

The invention relates to a rapid bridge flexibility measuring device, and belongs to the technical fields of bridge structure detection and identification. The device comprises a bridge and rod connecting system, a flexibility transfer system and a pedestal, the bridge and rod connecting system is connected to the flexibility transfer system, the flexibility transfer system is connected via an indicating gauge support system, and the indicating gauge support system is connected with the pedestal. The rapid bridge flexibility measuring device is convenient to dismount and simple in operation, a routine method for measuring the bridge flexibility is greatly simplified, influence of cooperative measures in routine detection on the measuring result can be eliminated, the measuring difficulty is reduced, and the measuring accuracy is improved.

Description

A device for quickly measuring bridge deflection

technical field

The invention relates to a device for quickly measuring bridge deflection, which is suitable for bridge deflection measurement and belongs to the technical field of bridge structure detection and identification.

Background technique

With the rapid development of the national economy, a number of large and extra-large bridges have been built in various places in recent years. The bridges have various forms, including continuous bridges, cantilever bridges, arch bridges, steel frame bridges, and suspension bridges.

In order to test whether the working performance and construction of the bridge structure meet the design requirements, ensure the reliability of the bridge operation, and provide a basis for the completion acceptance of the bridge, it is necessary to conduct static and dynamic load tests on the bridge.

An important part of the static load test is to measure the deformation of the structure, that is, the deflection. However, due to the high working platform, it is difficult to use measuring instruments such as dial gauges to obtain accurate measurement values.

Published on April 29, 2015, the patent number is CN201510005413.3, and the Chinese invention patent named a small and medium-span bridge deflection measurement device discloses a small and medium-span bridge deflection measurement device, which is installed on the main beam to be tested , including a column support device, a rigid guide beam, an electromechanical dial indicator, a meter frame connection support device and a data acquisition system. A column support device is installed at the beginning and end of the span of the main girder to be tested. The column support device consists of a support base, a support The threaded column on the upper part of the base, the height-adjusting nut on the threaded column and the cube connection device on the upper part of the height-adjusting nut are composed. The two ends of the rigid guide beam are respectively connected with the cube connection device. A steel hoop is installed, and the electromechanical dial indicator is connected to the steel hoop through the meter frame connection support device. The bottom of the meter frame connection support device is kept in contact with the main beam to be tested. connect. The invention can realize accurate positioning of measuring points and rapid collection of data when testing the deflection of medium and small-span bridges.

The disadvantages of this technical solution are: 1. It is only suitable for measuring the deflection of bridges with small and medium spans; 2. The measuring device is relatively complicated, the size of the components is large, it is not easy to carry, and the installation and debugging are time-consuming; 3. The device is installed on the bridge The upper part of the bridge will affect the normal loading of the bridge.

Therefore, developing a deflection measuring device of a bridge that is simple, feasible and can ensure fast and accurate deflection measurement has become a technical problem that needs to be solved urgently in this technical field.

Contents of the invention

The purpose of the present invention is to provide a bridge deflection measuring device, which transmits the deflection change of the beam to the ground by using connecting rods, threaded sleeves and a base, so that it is convenient to use a dial indicator on the ground to perform measurement readings and ensure the accuracy of the measurement process. Simplicity and accuracy of measurement results.

To achieve the above object, the present invention adopts the following technical solutions:

A device for quickly measuring bridge deflection, comprising a bridge and bar connection system, a deflection transmission system and a base device, the bridge and bar connection system is connected to the deflection transmission system, and the deflection transmission system passes through the The sub-meter support system is connected, and the dial indicator support system is connected with the base.

Preferably, the bridge and member connection system is wooden blocks.

Preferably, the deflection transmission system includes a fixed-length steel wire rope, several fixed-length rods, several rod connection interfaces, one threaded rod, an adjustable threaded sleeve and a platform plate; one end of the fixed-length steel wire is connected to The wooden pads are connected, and the other end is connected with the fixed-length rod through the rod connection interface, and the fixed-length rods are connected through the rod connection interface, and the threaded rod is located at At the lowermost end, the threaded rod is screwed to a height-adjustable threaded casing, and the height-adjustable threaded casing is connected to the platform board.

Preferably, the length of the fixed-length steel wire rope is 0.25 meters, the length of the fixed-length rods is 0.5 meters, a total of four, and the length of the threaded rods is 0.2 meters.

Preferably, the base device is composed of a square base, a dial indicator support system, and a V-shaped spring. One end of the dial indicator support system is connected to the platform plate, and the other end is connected to the square base. The V-shaped spring The upper end of the V-shaped spring is connected with the platform plate, and the lower end of the V-shaped spring is connected with the square base.

Advantages of the present invention:

1. The bridge deflection measuring device of the present invention has simple and accurate measurement and simplifies the measurement process.

2. The deflection is transmitted by the split rod system, and the tools are convenient to make and easy to carry.

3. Use rods and wire ropes to transmit the deflection of the bridge beam to the ground, which greatly reduces the difficulty of on-site operation.

4. The present invention has broad application prospects and has good economic and social benefits.

The present invention will be further described below through the drawings and specific embodiments, but it does not mean to limit the protection scope of the present invention.

Description of drawings

Fig. 1 is a structural schematic diagram of a device for rapidly measuring bridge deflection according to the present invention.

Main reference signs:

1 Bridge to be inspected 2 Wooden blocks

3 Wire rope 4 Connecting rod

5 Rod connection port 6 Height-adjustable threaded sleeve

7 Platform plate 8 V-shaped spring

9 Dial Indicator Holder System 10 Base

detailed description

Example 1

As shown in Figure 1, it is a structural schematic diagram of the rapid bridge deflection measurement device of the present invention, wherein, 1 is a bridge to be detected, 2 is a wooden spacer, 3 is a steel wire rope, 4 is a connecting rod, 5 is a connecting interface of a rod, and 6 7 is a platform plate, 8 is a V-shaped spring, 9 is a dial indicator support system, and 10 is a square base.

The device for quickly measuring bridge deflection of the present invention includes a bridge and bar connection system, a deflection transmission system and a base device, the bridge and bar connection system is connected with the deflection transmission system, and the deflection transmission system passes through the The dial indicator support system is connected, and the dial indicator support system is connected with the base.

The connecting system of the bridge and the bar is a wooden spacer 2 .

The deflection transmission system includes 3 fixed-length steel wire ropes, 4 fixed-length rods 4, 5 rod connection interfaces, 1 threaded rod, adjustable height threaded casing 6 and platform plate 7; One end of the fixed-length steel wire rope 3 is connected to the wooden spacer 2, and the other end is connected to the fixed-length rod 4 through the rod connection interface 5, and the fixed-length rod 4 passes through the rod The connection interface 5 is connected, and the threaded rod is located at the lowermost end. The threaded rod is screwed to the height-adjustable threaded sleeve 6 , and the height-adjustable threaded sleeve 6 is connected to the platform plate 7 .

The length of the fixed-length steel wire rope 3 is 0.25 meters, the length of the fixed-length rod 4 is 0.5 meters, and the length of the threaded rod is 0.2 meters.

The base device is made up of a square base 10, a dial indicator support system 9 and a V-shaped spring 8. One end of the dial indicator support system 9 is connected with the platform plate 7, and the other end is connected with the square base 10. The upper end of the V-shaped spring 8 is connected with the platform plate 7 , and the lower end of the V-shaped spring 8 is connected with the square base 1 .

The device for quickly measuring bridge deflection of the present invention transmits the deflection of the beam bottom of the bridge 1 to be detected to the vicinity of the ground through the connection between the rod and the wooden pad at the bottom of the beam, the rod and the platform plate, and the V-shaped spring of the platform plate and the base.

The bridge and rod connection system in the device for quickly measuring bridge deflection of the present invention is used to fix the rod to the bottom surface of the beam body of the bridge 1 to be detected, so that the deflection change at the bottom of the beam can continue to be transmitted downward along the deflection transmission system, and the deflection transmission The upper part of the system adopts thin and soft steel wire ropes to ensure that the deflection direction is vertically downward. The lower part is connected to the platform plate, and the platform plate and the base are effectively tensioned by V-shaped springs to ensure that the deflection of the beam can be effectively, accurately and directly reflected on the platform plate position, the dial indicator is used to directly measure the height change of the platform plate, so that the deflection of the beam body can be obtained through indirect, convenient, intuitive and accurate measurement.

The beam body and rod connection system uses superglue to fix the disposable wooden block on the bottom of the bridge beam to be tested, and then connects the wooden block to the rod connection interface through a steel wire rope.

The dial indicator can be fixed on the square base through the base device, and the square base is connected with the platform plate through the V-shaped spring.

The dial indicator support system includes a dial indicator and a support. The dial indicator is a relatively high-precision measuring tool, and the deflection value of the bridge can be measured more accurately by using it.

When the present invention is used for deflection measurement, comprise the following steps:

1. Installation preparation and commissioning

First fix the wooden block on the bottom of the beam, and then connect one end of the 250mm long steel wire rope with the fixing groove of the wooden block, and connect the other end with the reserved hole of the connecting rod, so that the deflection direction transmitted by the steel wire rope is guaranteed to be vertically downward, and the deflection can be Pass it vertically to the connecting rods, determine the number of connecting rods according to the distance from the point to be measured to the ground, and connect them to the connecting interface of the rods. During the connection process, pay attention to ensure that the screw connection is intact, ensure that the connecting rods are vertical, and avoid The measurement error caused by the tilt of the member. Fix the dial indicator on the square base, then place the square base on the ground, and pay attention to ensure the stability and reliability of the square base.

2. Zero setting

After the installation is completed, the base is connected to the platform plate through a V-shaped spring, and the spring is tensioned to ensure that the platform plate can still be in a tensioned state when it sinks to 2 times the theoretical deflection. By adjusting the height-adjustable threaded sleeve, the hundred The small pointer of the sub-meter is in a certain integer position, and the large pointer (minimum scale pointer) refers to zero.

3. Test

Add the load, and read the deflection value by observing the change of the size pointer of the dial gauge. The deflection measurement work is completed conveniently and quickly, and the accuracy of the numerical measurement is effectively guaranteed.

The device for quickly measuring bridge deflection of the present invention is easy to disassemble and easy to operate, which greatly simplifies the conventional method of measuring beam deflection, and can also avoid the influence of conventional detection surrounding coordination measures on the measurement results, which not only reduces the difficulty of measurement, but also improves the measurement accuracy. precision.

Claims (7)

1. A kind of fast measuring bridge deflection device, it is characterized in that: comprise bridge and bar connection system, deflection transmission system and base device, described bridge and bar connection system are connected with described deflection transmission system, and described deflection The transmission system is connected through the dial indicator support system, and the dial indicator support system is connected with the base. 2. The device for quickly measuring bridge deflection according to claim 1, characterized in that: said bridge and bar connection system is a wooden spacer. 3. The device for quickly measuring bridge deflection according to claim 2, characterized in that: the deflection transmission system includes a fixed-length steel wire rope, several fixed-length rods, several rod connection interfaces, and one threaded rod, Adjustable threaded sleeve and platform board; one end of the fixed-length steel wire rope is connected to the wooden block, and the other end is connected to the fixed-length rod through the rod connection interface, and the fixed-length rod The threaded rods are located at the bottom end, and the threaded rods are screwed to the adjustable-height threaded casing, and the adjustable-height threaded casing is connected to the platform board . 4. The device for quickly measuring bridge deflection according to claim 3, characterized in that: the base device is composed of a square base, a dial indicator support system, and a V-shaped spring, and one end of the dial indicator support system is connected to the platform plate The other end is connected with the square base, the upper end of the V-shaped spring is connected with the platform plate, and the lower end of the V-shaped spring is connected with the square base. 5. The device for quickly measuring bridge deflection according to claim 4, characterized in that: said dial indicator support system comprises a dial indicator and a support connected thereto. 6. The device for quickly measuring bridge deflection according to claim 5, characterized in that: one end of the steel wire rope is connected to the fixing groove of the wooden block, and the other end is connected to the reserved hole of the connecting rod. 7. The device for rapidly measuring bridge deflection according to claim 6, characterized in that: the length of the fixed-length steel wire rope is 0.25 meters, the length of the fixed-length rod is 0.5 meters, there are four in total, the threaded The length of the bar is 0.2 meters.