Double-deck steel truss girder closure opening measuring device

Abstract

The utility model relates to the technical field of measuring devices, in particular to a double-deck steel truss girder closure opening measuring device which comprises a dial indicator, a basic measuring rod, an extension measuring rod, a gear engaging assembly, a lighting assembly, a horizontal ruler, a hollow column, a sliding column, a limiting sliding column, a positioning bolt, scale marks, a limiting sliding groove, a threaded connection hole, a threaded connection column, a lighting installation hole, a gooseneck pipe and a lighting lamp. The length can be flexibly adjusted according to the measuring distance, and the adaptability is high; the combination of the gear engaging assembly and the leveling instrument enables the device to be simple and convenient to operate, easy to fix and level, and guarantees the measurement precision. The dial indicator can be used as a ruler and a measuring rod independently after being separated from the basic measuring rod; a lighting assembly is arranged, so that clear reading can be realized during night measurement; compared with a total station measurement mode, a mechanical displacement transmission measurement method is adopted, initial value setting and geometrical relationship back calculation are combined, personal errors are reduced, and the measurement precision is high and stable.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, specifically a measuring device for the closure joint of a double-layer bridge deck steel truss. Background Technology

[0002] Steel trusses have high structural rigidity, can withstand large loads and deformations, have good spanning capacity, and are easy to implement in a three-dimensional traffic layout with double-deck bridges. Therefore, steel truss bridges are widely used in dual-purpose road and rail bridges to reduce land occupation and redundant construction, and to reduce project costs and construction period. However, due to its high overall rigidity, the double-deck steel truss bridge is difficult to adjust for errors during construction. Furthermore, the deformation of each truss is inconsistent during installation, resulting in numerous connection points. High precision is required for the main truss components during the closure phase. Before the closure of the double-deck continuous steel truss bridge section, the relative position of the beams at the two conjugate cantilever ends is affected by factors such as sunlight duration, ambient temperature, and construction errors. This leads to a difference between the beams at the cantilever ends and the theoretical state. Therefore, closure measurement is necessary before closure, requiring precise measurement of the horizontal spacing parameters at the closure joint every two hours daily. Existing closure joint measurement techniques mainly involve placing a total station at a control point, aligning it with the control point on the opposite side for coordinate measurement, and then calculating and recording the straight-line distance between the control points on both sides of the closure joint. If the closure joint distance is short, measuring devices such as steel rulers can be used directly. However, this method is inefficient and requires highly skilled personnel. Therefore, a new closure joint measurement device for double-deck steel truss bridges is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a measuring device for the closure of a double-layer bridge deck steel truss girder, so as to solve the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a measuring device for the closure joint of a double-layer bridge deck steel truss girder, comprising a dial indicator, a base measuring rod, and an extension measuring rod. One end of the base measuring rod is fixedly connected to the dial indicator, and the other end is fixedly connected to the extension measuring rod. Both the base measuring rod and the extension measuring rod are composed of a hollow column and a sliding column. The sliding column is slidably fitted inside the hollow column. A limiting groove is provided on the side plate of the hollow column. A limiting sliding column is fixedly connected to one end of the hollow column. The limiting sliding column is slidably disposed within the limiting groove. External threads are provided on the outer walls of both ends of the limiting sliding column. The outer wall of the area within the limiting slide groove is a smooth surface. The slide column has a threaded hole for mounting the limiting slide column. One end of the limiting slide column is threaded into the threaded hole of the slide column. A positioning bolt is threaded onto the outer thread of the limiting slide column. A wear-resistant and anti-slip pad is laminated on the side of the positioning bolt near the hollow column. The end of the hollow column away from the slide column is a closed structure, and a threaded connecting column is fixedly connected at the center of the end face. Threaded connecting holes that are compatible with the threaded connecting column are opened on one end of the slide column and the end face of the clamping rod of the dial indicator. An illumination component is installed on the end of the base measuring rod near the dial indicator.

[0005] Preferably, a lighting mounting hole is provided on one side of the hollow column of the base measuring rod. The lighting assembly consists of a gooseneck tube, a lighting lamp, and a threaded connection. The two ends of the gooseneck tube are respectively connected to the lighting lamp and the threaded connection, and the threaded connection is threaded into the lighting mounting hole.

[0006] Preferably, a spirit level is installed on one side of the hollow column of the base measuring rod. Except for the spirit level and the lighting mounting hole, the base measuring rod and the extension measuring rod are completely identical in structure. The top surface of the hollow column and the sliding column is provided with scale lines.

[0007] Preferably, it also includes a gear shifting assembly, which is composed of a right-angle plate and a threaded connecting post, the threaded connecting post being fixedly connected to one side plate of the right-angle plate.

[0008] Preferably, after the sliding column is pulled out from the hollow column, the maximum length of the sliding column and the hollow column is 2m and the minimum length is 1m.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This invention allows for flexible length adjustment based on measurement distance, offering strong adaptability. The combination of the stop assembly and the level makes it easy to operate, fix, and level, ensuring measurement accuracy. The device is multifunctional; the dial indicator can be used independently as a ruler and measuring rod after being separated from the base measuring rod. Equipped with an illumination component, it provides clear readings even at night. Compared to total station measurements, this method uses mechanical displacement transmission, combined with initial value setting and geometric back-calculation, reducing human error and achieving high and stable measurement accuracy. The overall structure is simple and practical, integrating multiple functions and facilitating portability and maintenance. It has broad application value, effectively improving measurement efficiency and quality, and ensuring construction progress and accuracy. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of the disassembled structure of each component of this utility model;

[0013] Figure 3 This is a schematic diagram of the basic measuring rod structure of this utility model;

[0014] Figure 4 This utility model Figure 1 Top view;

[0015] Figure 5 This is a schematic diagram showing the location of the measuring points when this utility model is in use.

[0016] In the diagram: 1. Dial indicator; 2. Base measuring rod; 3. Extension measuring rod; 4. Stop assembly; 5. Lighting assembly; 6. Level; 21. Hollow column; 22. Sliding column; 23. Limiting sliding column; 24. Positioning bolt; 25. Scale line; 21a. Limiting groove; 22a. Threaded connection hole; 22b. Threaded connection column; 21b. Lighting mounting hole; 51. Gooseneck tube; 52. Lighting lamp. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1 to 5 This utility model provides a technical solution: a measuring device for the closure joint of a double-layer bridge deck steel truss girder, comprising a dial indicator 1, a base measuring rod 2, and an extension measuring rod 3. One end of the base measuring rod 2 is fixedly connected to the dial indicator 1, and the other end is fixedly connected to the extension measuring rod 3. Both the base measuring rod 2 and the extension measuring rod 3 are composed of a hollow column 21 and a sliding column 22. The sliding column 22 is slidably sleeved inside the hollow column 21. A limiting groove 21a is provided on the side plate of the hollow column 21. A limiting sliding column 23 is fixedly connected to one end of the hollow column 21. The limiting sliding column 23 is slidably disposed in the limiting groove 21a. External threads are provided on the outer walls of both ends of the limiting sliding column 23, which is located in the limiting groove 21a. The outer wall of the inner area is a smooth surface. The sliding column 22 has a threaded hole for installing the limiting sliding column 23. One end of the limiting sliding column 23 is threaded into the threaded hole of the sliding column 22. The limiting sliding column 23 is threaded with a positioning bolt 24. The side of the positioning bolt 24 near the hollow column 21 is reinforced with a wear-resistant and anti-slip pad. The end of the hollow column 21 away from the sliding column 22 is a closed structure, and a threaded connecting column 22b is fixedly connected at the center of the end face. One end of the sliding column 22 and the end face of the clamping rod of the dial indicator 1 are provided with threaded connecting holes 22a that are adapted to the threaded connecting column 22b. The end of the base measuring rod 2 near the dial indicator 1 is equipped with an illumination component 5.

[0019] Furthermore, a lighting mounting hole 21b is provided on one side of the hollow column 21 of the base measuring rod 2. The lighting assembly 5 consists of a gooseneck tube 51, a lighting lamp 52 and a threaded connection part. The two ends of the gooseneck tube 51 are respectively connected to the lighting lamp 52 and the threaded connection part, and the threaded connection part is threadedly installed in the lighting mounting hole 21b.

[0020] Furthermore, a level 6 is installed on one side of the hollow column 21 of the base measuring rod 2. Except for the level 6 and the lighting mounting hole 21b, the base measuring rod 2 and the extension measuring rod 3 are completely identical in structure. The top surface of the hollow column 21 and the sliding column 22 is provided with scale lines 25.

[0021] Furthermore, it also includes a gear shift assembly 4, which consists of a right-angle plate and a threaded connecting post 22b, with the threaded connecting post 22b fixedly connected to one side plate of the right-angle plate.

[0022] Furthermore, after the sliding column 22 is pulled out from the hollow column 21, the maximum length of the sliding column 22 and the hollow column 21 is 2m and the minimum length is 1m.

[0023] The working process of this utility model is as follows:

[0024] like Figure 1 - Figure 5 As shown, when using the device, select an appropriate number of extension measuring rods 3 according to the distance between the ends of the conjugate cantilever of the steel truss beam. The sliding column 22 slides inside the hollow column 21 to adjust the overall length of the device. One end of the hanging assembly 4 is hung on the steel truss beam at the end of the conjugate cantilever beam. The device is leveled by observing the level ruler 6 on the base measuring rod 2. After the device is leveled, record the reading of the dial indicator 1. After a period of time, measure again with the same length and the same position. When measuring at night, install the lighting assembly 5 on the base measuring rod 2 for reading and illumination. After the dial indicator 1 is separated from the base measuring rod 2, the base measuring rod 2 and the extension measuring rod 3 can be used as a ruler and measuring rod.

[0025] The measurement method of the device is as follows: before the closure of the closure section of the double-deck continuous steel truss bridge, 16 pairs of closure joint measurement reference points are set at the relative positions of the beams at the two conjugate cantilever ends. Among them, there are 4 pairs at the top of the upper beam and 4 pairs at the bottom of the lower beam. The measurement points 1, 2, 3, 4 between the upper layers correspond to the measurement points 1', 2', 3', 4' in pairs. The measurement points 5, 6, 7, 8 between the lower layers correspond to the measurement points 5', 6', 7', 8' in pairs. The measurement points 1, 2, 3, 4 between the upper layers correspond to the measurement points 5', 6', 7', 8' in the lower layers. The measurement points 5, 6, 7, 8 between the lower layers correspond to the measurement points 1', 2', 3', 4' in the upper layers. A total of 16 pairs of paired measurement points are used. During the first measurement, a total station and steel tape were used to measure the absolute coordinates of the closure section reference points and the horizontal distance, vertical height difference, and spatial rotation angle between any reference points at the closure beam end. The initial distance between any reference points at the closure beam end was measured and set digitally. In the second and subsequent measurements, this device was used to mechanically transmit displacement, converting the relative displacement between any two reference points at the closure joint into the difference between two readings of the displacement gauge. This difference was then superimposed on the initial value display to obtain the absolute distance between any two reference points at the closure joint. Finally, using the triangular geometric relationships between the closure joint reference points, the horizontal distance, vertical height difference, and spatial rotation angle between any reference points at the closure beam end were calculated.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A measuring device for the closure joint of a double-layer bridge deck steel truss girder, characterized in that: The device includes a dial indicator (1), a base measuring rod (2), and an extension measuring rod (3). One end of the base measuring rod (2) is fixedly connected to the dial indicator (1), and the other end is fixedly connected to the extension measuring rod (3). Both the base measuring rod (2) and the extension measuring rod (3) are composed of a hollow column (21) and a sliding column (22). The sliding column (22) is slidably fitted inside the hollow column (21). A limiting groove (21a) is provided on the side plate of the hollow column (21). A fixed connection is provided at one end of the hollow column (21). The limiting slide column (23) is slidably disposed in the limiting slide groove (21a). The hollow column (21) is closed at the end away from the slide column (22), and a threaded connecting column (22b) is fixedly connected at the center of the end face. The slide column (22) and the clamping rod end face of the dial indicator (1) are provided with threaded connecting holes (22a) that are adapted to the threaded connecting column (22b). The base measuring rod (2) is equipped with an illumination component (5) at the end near the dial indicator (1).

2. The measuring device for the closure joint of a double-layer bridge deck steel truss girder according to claim 1, characterized in that: The outer walls of the limiting slide column (23) at both ends are provided with external threads. The outer wall of the area within the limiting slide groove (21a) is a smooth surface. The slide column (22) is provided with threaded holes for installing the limiting slide column (23). One end of the limiting slide column (23) is threadedly installed in the threaded hole of the slide column (22). The limiting slide column (23) is threaded with a positioning bolt (24). The positioning bolt (24) is fitted with a wear-resistant and anti-slip pad on the side of the hollow column (21) near the hollow column (21).

3. The measuring device for the closure joint of a double-layer bridge deck steel truss girder according to claim 1, characterized in that: The hollow column (21) of the base measuring rod (2) has a lighting mounting hole (21b) on one side. The lighting assembly (5) consists of a gooseneck tube (51), a lighting lamp (52) and a threaded connection. The two ends of the gooseneck tube (51) are respectively connected to the lighting lamp (52) and the threaded connection. The threaded connection is threaded into the lighting mounting hole (21b).

4. The measuring device for the closure joint of a double-layer bridge deck steel truss girder according to claim 1, characterized in that: A level (6) is installed on one side of the hollow column (21) of the base measuring rod (2).

5. The measuring device for the closure joint of a double-layer bridge deck steel truss girder according to claim 1, characterized in that: It also includes a gear shift assembly (4), which is composed of a right-angle plate and a threaded connecting post (22b), and the threaded connecting post (22b) is fixedly connected to one side plate of the right-angle plate.

6. The measuring device for the closure joint of a double-layer bridge deck steel truss girder according to claim 3, characterized in that: The basic measuring rod (2) and the extended measuring rod (3) are completely identical in structure except for the level (6) and the lighting mounting hole (21b). The hollow column (21) and the sliding column (22) have scale lines (25) on their top surfaces.

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