Monitoring device for vertical displacement of main beam during replacement of beam type bridge support

Abstract

The utility model discloses a monitoring device for vertical displacement of a main beam during replacement of a beam type bridge support, and solves the problem that the traditional vertical displacement monitoring equipment such as a dial indicator, a pull rope type displacement meter, a laser displacement meter and a steel ruler is low in measurement accuracy and precision due to the fact that the traditional vertical displacement monitoring equipment is not placed vertically or the resolution ratio of a measuring tool is insufficient. The vertical displacement monitoring point is arranged on the side face of the pier cap or the abutment cap, and the depth vernier caliper is used for measuring the distance between the vertical displacement monitoring point and the bottom of the main beam, so that the monitoring precision and accuracy of the vertical displacement of the main beam are improved to a great extent, and the deviation of field sensor installation and alignment is eliminated; and the process of measuring the vertical displacement change of the main beam on site is simplified. And meanwhile, compared with the conventional measurement that a monitoring point is exposed to the outside, the monitoring point is transformed on the premise that the monitoring point is greatly damaged by man-made or environment. The method and the device have good economic practicability, are convenient to operate and are suitable for large-scale popularization and application.

Description

Technical Field

[0001] The utility model belongs to the field of bridge displacement monitoring, and particularly relates to a monitoring device for the vertical displacement of a main beam during the replacement of a beam bridge bearing in the construction process. Background Technique

[0002] In the project of replacing the beam bridge bearing, the change of the vertical displacement of the main beam at different stages is an important evaluation index for measuring the construction quality of the bearing replacement project. Usually, dial indicators, wire-pulling displacement gauges, laser displacement gauges, laser displacement gauges and steel straightedges are used as monitoring tools for the vertical displacement of the main beam. However, in the actual use process of these tools, there are problems of low measurement accuracy and precision caused by non-vertical placement or insufficient resolution of the measuring tools. This method can reduce or even eliminate the deviation generated during the installation and straightening of on-site sensors, improve the monitoring accuracy of the vertical displacement of the main beam, and also improve the vertical displacement monitoring points, making them less vulnerable to external damage to a certain extent. Content of the Utility Model

[0003] The purpose of the utility model is to provide a monitoring device for the vertical displacement of the main beam during the replacement of a beam bridge bearing. This device greatly improves the monitoring accuracy and precision of the vertical displacement of the main beam. At the same time, the vertical displacement monitoring points are transformed, so that the monitoring points can be stored and protected to avoid being exposed to the outside for a long time and being easily damaged by humans or the environment.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A monitoring device for the vertical displacement of the main beam during the replacement of a beam bridge bearing, the device includes a monitoring point fixed on the side of the pier cap or abutment cap;

[0006] The monitoring point includes a fixed base, a rotating shaft, a handle, a circular metal gasket that can be retracted into the fixed base, and a fixing pin; the fixed base is provided with a storage space for the circular metal gasket, the rotating shaft is fixedly connected to the circular metal gasket, and the rotating shaft is limited to rotate within the hinge at the bottom of the fixed base;

[0007] The circular metal gasket is retracted into the storage space through the rotating shaft or unfolded downward by 180° to fit the side of the pier cap or abutment cap. The fixing pin is used to fix the circular metal gasket after retraction. The rotatable handle is installed at one end of the rotating shaft to drive the rotating shaft to rotate. After the circular metal gasket is unfolded by 180°, the upper edge line of the base of the depth vernier caliper coincides with the absolutely horizontal tangent line below the circular metal gasket, and the left side of the scale body abuts against the vertical edge on the right side of the handle horizontally.

[0008] As a further preferred solution, the monitoring point further includes a safety pin, and the safety pin is installed at the other end of the rotating shaft for fixing and locking.

[0009] As a further preferred solution, the thickness of the accommodating space of the fixed base is greater than or equal to the thickness of the circular metal gasket, and a rubber ring for sealing is installed on the contact surface between the fixed base and the circular metal gasket. The circular metal gasket and the outer side of the fixed base are coated with waterproof materials.

[0010] As a further preferred solution, the monitoring point further includes a brim, and the brim wraps around the upper part and both sides of the fixed base to prevent rainwater from eroding the monitoring point.

[0011] As a further preferred solution, the monitoring point is arranged on the side of the pier cap or abutment cap, 10 - 30 cm away from the top surface of the pier cap or abutment cap. The dust and surface floating slurry on the side of the pier cap or abutment cap need to be cleaned thoroughly and the surface needs to be flat and dry. The monitoring point also needs to avoid the layout position of the bearing so as not to affect the placement and measurement of the depth vernier caliper.

[0012] As a further preferred solution, the number of the monitoring points is the same as and corresponds one by one to the number of the bearings. Beneficial effects

[0013] The utility model has the following beneficial effects:

[0014] By adopting the method of arranging vertical displacement monitoring points on the side of the pier cap or abutment cap and using a depth vernier caliper to measure the distance between the vertical displacement monitoring point and the bottom of the main beam, the monitoring accuracy and precision of the vertical displacement of the main beam are greatly improved, the deviation of on-site sensor installation and alignment is eliminated, and the process of measuring the change of the vertical displacement of the main beam on-site is simplified. At the same time, compared with the conventional measurement in which the monitoring points are exposed to the outside and are more likely to be damaged artificially or by the environment, the vertical displacement monitoring points are reformed, which has good economic practicality, convenient operation and is suitable for large-scale popularization and application. Brief description of the drawings

[0015] Figure 1 It is a schematic diagram of the monitoring method of the utility model (composite box girder);

[0016] Figure 2 It is a front view of the unfolded form of the monitoring point of the utility model;

[0017] Figure 3 It is a left view of the unfolded form of the monitoring point of the utility model;

[0018] Figure 4 It is a front view of the folded form of the monitoring point of the utility model.

[0019] Among them: 1. Bearing; 2. Monitoring point; 21. Fixed base; 22. Rotating shaft; 23. Handle; 24. Circular metal gasket; 25. Safety pin; 26. Fixed pin; 27. Brim; 3. Pier cap or abutment cap; 4. Main beam; 5. Depth vernier caliper. Detailed implementation mode

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] As Figure 1 shown, according to the beam bridge structure, a vertical displacement monitoring point 2 is selected to be set at a position on the side surface of the pier cap or abutment cap 3 that is 10 - 30 cm away from the top surface of the pier cap or abutment cap 3 and as flat and dry as possible on the surface. The layout position of the bearing 1 also needs to be avoided to prevent it from affecting the placement and measurement of the depth vernier caliper 5. Use a steel straightedge to measure the approximate distance from the bottom of the main beam 4 to the top surface of the pier cap or abutment cap 3, and select a depth vernier caliper 5 with a suitable measuring range. Use a wire brush to clean the dust and surface floating slurry on the side surface of the pier cap or abutment cap 3 to facilitate the subsequent installation of the vertical displacement monitoring point 2; after selecting a suitable position, draw a horizontal line that aligns with the upper edge of the fixed base 21. Install the vertical displacement monitoring point 2 at the selected suitable position, apply AB glue on the back of the fixed base 21, align the upper edge of the fixed base 21 with the drawn horizontal line. After ensuring that the monitoring point 2 is vertical, stick it to the side surface of the pier cap or abutment cap 3, and release it after pressing until the colloid solidifies and the fixed base 21 is firmly adhered.

[0022] As Figures 2 - 4 shown, eaves 27 are installed on the upper part and both sides of the fixed base 21, and the thickness at the receiving space of the fixed base 21 is greater than or equal to the thickness of the circular metal gasket 24 to isolate the erosion of rainwater. When measurement is required, open the safety pin 25, rotate the handle 23 counterclockwise to drive the rotation of the rotating shaft 22, fully unfold the circular metal gasket 24 so that it fits against the side surface of the pier cap or abutment cap 3, then lower the fixed pin 26 to lock it with the rotating shaft 22 to prevent the movement of the circular metal gasket 24.

[0023] Use a spirit level to contact the lower edge of the circular metal gasket 24, adjust the angle of the spirit level so that its indication shows 0°, at this time the spirit level coincides with the absolutely horizontal tangent line directly below the circular metal gasket 24, and use a marker pen to draw this tangent line as the measurement reference line for the depth vernier caliper 5. Select a depth vernier caliper 5 with a precision of 0.02 mm, make the upper edge line of its measuring base fit against the absolutely horizontal tangent line below the circular metal gasket 24; the left side of the ruler body abuts against the horizontal right vertical edge of the handle 23, and use a marker pen to draw this tangent line so that it intersects with the absolutely horizontal tangent line below the circular metal gasket 24 to facilitate subsequent multiple measurement reference lines.

[0024] Push the body of the depth vernier caliper 5 upward so that its top fits against the bottom of the main beam 4. After marking the fitting surface on the bottom of the beam with a marker pen, tighten the fastening screw, read the reading on the depth vernier caliper 5, and continue to record it.

[0025] After the measurement is completed, rotate the handle 23 clockwise to retract the circular metal gasket 24. The rubber ring built into the fixed base 21 seals the side of the circular metal gasket 24 with the storage space inside the fixed base 21. Lower the safety pin 25 to prevent the circular metal gasket 24 from falling.

[0026] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solution of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A monitoring device for the vertical displacement of a main beam when replacing a beam bridge support, characterized in that: The device comprises a monitoring point (2) fixed to the side of a pier cap or a platform cap (3); The monitoring point (2) comprises a fixed base (21), a rotating shaft (22), a handle (23), a circular metal gasket (24) that can be stored in the fixed base (21), and a fixing pin (25); the fixed base (21) has a storage space for the circular metal gasket (24), the rotating shaft (22) is fixedly connected to the circular metal gasket (24), and the rotating shaft (22) is limitedly rotated in a hinge at the bottom of the fixed base (21); The circular metal gasket (24) is stored in the storage space through the rotating shaft (22) or unfolded downward by 180 degrees to fit the side of the pier cap or the platform cap (3). The fixing pin (25) is used to fix the stored circular metal gasket (24). The twistable handle (23) is installed on one end of the rotating shaft (22) to drive the rotating shaft (22) to rotate.

2. The device for monitoring the vertical displacement of the main beam when replacing the beam bridge support according to claim 1 is characterized in that: The monitoring point (2) further comprises a safety pin (26), and the safety pin (26) is mounted on the other end of the rotating shaft (22) for fixing and locking.

3. The device for monitoring the vertical displacement of the main beam when replacing the beam bridge support according to claim 1 is characterized in that: The thickness of the receiving space of the fixed base (21) is greater than or equal to the thickness of the circular metal gasket (24), and a rubber ring for sealing is installed on the contact surface between the receiving space of the fixed base (21) and the circular metal gasket (24), and the outer sides of the circular metal gasket (24) and the fixed base (21) are coated with waterproof material.

4. The device for monitoring the vertical displacement of the main beam when replacing the beam bridge support according to claim 1 is characterized in that: The monitoring point (2) further comprises a brim (27), wherein the brim (27) wraps around the upper part and both sides of the fixed base (21) to prevent rainwater from corroding the monitoring point (2).

5. The device for monitoring the vertical displacement of the main beam when replacing the beam bridge support according to claim 1 is characterized in that: The monitoring point (2) is arranged on the side of the pier cap or the platform cap (3), and is 10-30 cm away from the top surface of the pier cap or the platform cap (3).

6. The device for monitoring the vertical displacement of the main beam when replacing the beam bridge support according to claim 1 is characterized in that: The number of the monitoring points (2) is the same as the number of the supports (1) and corresponds one to one.

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