An apparatus and method for laying out the steel web of a bridge.

Abstract

The present application relates to a kind of bridge steel web lofting device and method, using total station, prism, small prism centering rod fast leveling device, small prism centering rod fast leveling device includes upper centering rod, small prism, lower centering rod, T-shaped connecting rod, nut, rope clamp, U bolt, upper pull rod, adjusting rod, lower pull rod, lower limit nut, small prism upper end is fixedly connected with upper centering rod, and is provided with horizontal bubble seat, lower end is fixedly connected with lower centering rod, upper centering rod is fixedly connected with rope clamp by connecting U bolt and nut on it, U bolt both sides are connected with hinged lug by the T-shaped connecting rod of upward inclination respectively, and hinged lug is welded with upper pull rod below, and upper pull rod is connected with lower pull rod by adjusting rod screw thread.Using small prism centering rod fast leveling device, can improve the collection efficiency and accuracy of measurement data, simple structure, convenient operation, save manpower cost, to effectively avoid the occurrence of human error and accidental error, guarantee the quality of steel web installation.

Description

Technical Field

[0001] This invention relates to the field of bridge steel web layout technology in traffic engineering, and in particular to an apparatus and method for bridge steel web layout. Background Technology

[0002] Bridges play a crucial role in highway and municipal transportation engineering, and the web plate of a bridge is an important part of the supporting structure of a box girder bridge. With the continuous advancement of science and technology and construction techniques, the application of corrugated steel web plates in box girder bridges has gradually been promoted and is now widely used.

[0003] During the installation and measurement of the steel web, the small clearance between the upper edge plates of the corrugated steel web and its relatively smooth surface increased the difficulty of the measurement operation. After aligning the small prism with the target point, the surveyor manually controlled the bubble of the small prism to be centered.

[0004] Due to the limited working space, the levelness of the small prism is adjusted by the surveyor shaking the prism rod, requiring the surveyor to maintain one position for an extended period until data acquisition is complete. This not only increases the risk of uncontrollable random errors during the measurement process, which are difficult to eliminate through measurement methods, but also consumes a large amount of manpower, reduces work efficiency, and to some extent increases the dangers of working at heights. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technical methods, this invention provides a device and method for laying out the steel web of a bridge. This method keeps the measuring points to be laid out horizontal and stable, reduces errors caused by unnecessary human and natural factors, ensures the quality of steel web positioning and installation, and improves work efficiency and data accuracy. This device and method have already been widely applied in ongoing construction projects.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A bridge steel web layout device includes a total station, a prism, and a small prism centering rod rapid leveling device. The small prism centering rod rapid leveling device includes an upper centering rod, a small prism, a lower centering rod, a T-shaped connecting rod, a nut, a rope clamp, a U-bolt, a hinge lug, a horizontal bubble seat, an upper limit nut, an upper pull rod, an adjusting rod, a lower pull rod, and a lower limit nut. The upper end of the small prism is fixedly connected to the upper centering rod and is equipped with a horizontal bubble seat, while the lower end is fixedly connected to the lower centering rod. The rope clamp is fixedly connected to the upper centering rod by connecting U-bolts and nuts. The two sides of the U-bolt are connected to hinge lugs by upwardly inclined T-shaped connecting rods. An upper pull rod is welded below the hinge lugs, and the upper pull rod is threadedly connected to the lower pull rod through an adjusting rod.

[0008] Furthermore, a strong magnetic attraction device is welded to the bottom of the pull rod along its axis.

[0009] Furthermore, the strong magnetic device is fixed to the bottom of the pull rod by a hinge.

[0010] Furthermore, the upper centering rod can freely pass through the U-bolt to install the rope clamp component, and the upper centering rod is fixed to the U-bolt by hand-tightening the screw.

[0011] Furthermore, the upper and lower pull rods have opposite thread directions, respectively engaging with the left-hand and right-hand threads at both ends of the adjusting rod.

[0012] This invention provides a method for laying out the steel web of a bridge, using a bridge steel web laying out device, and includes the following steps:

[0013] Step 1: Set up the total station on the control point, level the electronic bubble level of the total station, and input the coordinate data of the station point and backsight point;

[0014] Step 2: Set up the prism at the backsight point and level its horizontal bubble, aligning the prism with the direction of the total station.

[0015] Step 3: Aim the total station at the backsight prism for observation and orientation, and check its accuracy by measuring the third point.

[0016] Step 4: Set up a small prism at the control point of the central axis of the steel web. Quickly level the small prism by rotating the left and right adjustment rods and align the direction of the small prism with the total station.

[0017] Step 5: The surveyors use a total station to aim at the small prism and collect coordinate data. They then compare the measured coordinate data of the steel web centerline with the design theoretical data to guide the installation and positioning of the steel web until the installation error verification meets the design requirements.

[0018] The beneficial effects of this invention are:

[0019] This invention overcomes the problems of high difficulty, large leveling accuracy error, and low efficiency in leveling by manual alignment rods for surveyors. It adopts a bridge steel web layout device, in which a strong magnet at the bottom of the pull rod is attracted to the steel web, which can prevent the small prism support from slipping on the surface of the steel web. This maximizes the leveling accuracy of the small prism alignment rod, improves the efficiency and accuracy of measurement data acquisition, has a simple structure, is easy to operate, and saves labor costs. It effectively avoids human error and accidental errors, and ensures the quality of steel web installation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the small prism centering rod quick leveling device of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall front view of the small prism centering rod quick leveling device of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the small prism centering rod quick leveling device of the present invention from the left view.

[0023] Figure 4 A schematic diagram of the U-shaped card slot fixing system;

[0024] Figure 5 This is a schematic diagram of the telescopic rod adjustment system;

[0025] Figure 6 This is a schematic diagram of the bridge steel web layout method of the present invention;

[0026] Figure 7 This is a flowchart of the bridge steel web layout method of the present invention (with flowchart).

[0027] In the diagram: 1-Upper centering rod; 2-T-shaped connecting rod; 3-Nut; 4-Rope clamp; 5-U-bolt; 6-Small prism; 7-Lower centering rod; 8-Hinge ear; 9-Horizontal bubble seat; 10-Upper limit nut; 11-Upper pull rod; 12-Adjusting rod; 13-Lower pull rod; 14-Lower limit nut; 15 Strong magnet. Detailed Implementation

[0028] To facilitate understanding of the inventive features, usage methods, and functions of this invention, the invention will be further described in detail below with reference to specific embodiments.

[0029] like Figures 1 to 7 As shown, a bridge steel web layout device includes a total station, a prism, a small prism centering rod, and a rapid leveling device.

[0030] The small prism centering rod quick leveling device includes an upper centering rod 1, a T-shaped connecting rod 2, a nut 3, a rope clamp 4, a U-bolt 5, a small prism 6, a lower centering rod 7, a hinge lug 8, a horizontal bubble seat 9, an upper limit nut 10, an upper pull rod 11, an adjusting rod 12, a lower pull rod 13, a lower limit nut 14, and a strong magnet 15.

[0031] The upper centering rod 1 passes through the U-bolt 5, and the rope clamp 4 is inserted into the U-bolt 5. The upper centering rod 1 and the rope clamp 4 are fixed to the U-bolt 5 by hand-tightening the nut 3. T-shaped connecting rods 2 with upward inclination are welded to both sides of the U-bolt 5. The connecting rods 2 have hinge lugs 8, and an upper pull rod 11 is welded below the hinge lugs 8. The upper pull rod 11 and the lower pull rod 13 are threaded together by the adjusting rod 12. A strong magnetic attraction device 15 is welded to the bottom of the lower pull rod 13 along its axis. The upper end of the small prism 6 is fixedly connected to the upper centering rod 1 and is equipped with a horizontal bubble seat 9. The lower end is fixedly connected to the lower centering rod 7.

[0032] In this embodiment, the elongation is adjusted by rotating the adjusting rod 12 left and right on the upper pull rod 11 and the lower pull rod 13 to center the bubble in the horizontal bubble seat 9. The upper limit nut 10 and the lower limit nut 14 limit the elongation of the adjusting rod 12.

[0033] In this embodiment, the strong magnetic attraction device 15 can be attached to the top of the steel web plate, which can provide good support and prevent slippage.

[0034] This specific case study 1:

[0035] Taking the steel web plate installation layout method of a certain bridge construction project as an example, such as Figure 6 As shown,

[0036] Step 1: Set up the total station at station Q8, level the built-in electronic bubble level, and manually input the coordinate data of station Q8 (-24943.224,-2787.447,6.682) and backsight point Q9 (-25386.031,-2612.731,5.847) on the total station.

[0037] Step 2: Set up prisms at backsight point Q9 and check point Q7 respectively, and level the bubble on the long level tube axis of the prism so that the prism head is aligned with the direction of the total station.

[0038] Step 3: At the survey station Q8, aim the total station at the backsight point Q9 to perform azimuth orientation. Then aim the total station at the check point Q7 and measure its coordinate data. Compare it with the data handed over by the client. If the error is within the theoretical range, it means that the total station orientation is successful. Otherwise, find out the cause and re-orient.

[0039] Step 4: Install a small prism on the central axis of the east web of beam segment 1 of pier 64 of the main bridge. Use the leveling bracket to rotate the small prism by the left and right adjustment rods to quickly level the small prism and align the direction of the small prism with the total station.

[0040] Step 5: The surveyor aims the total station at the small prism to collect its coordinate data. The total station displays the coordinate data as (X=-25226.903,Y=-2793.612,Z=37.037). This data is compared with the design value of the centerline of the east web of beam segment #1. The coordinate error is (△x=0mm,△y=-2mm,△z=3mm), which meets the specification requirements. The precise positioning of the steel web is completed. If the coordinate error value exceeds the specification requirements, the steel web is readjusted and positioned according to the deviation value until the installation error meets the specification requirements.

[0041] In summary, this rapid leveling device for the small prism centering rod involves passing the centering rod through the gap between the U-bolt and the rope clamp, and then fixing the centering rod to the U-bolt by hand-tightening the nut. Furthermore, the magnetic attraction device at the bottom of the pull rod effectively secures the support system to the steel web, preventing deviation of the horizontal bubble of the centering rod caused by wind and slippage. These improvements overcome a series of problems associated with traditional small prism centering and leveling methods, such as high difficulty, low leveling accuracy, slow leveling efficiency, and the need for surveyors to manually hold the centering rod for extended periods. Using this rapid leveling device for the small prism centering rod significantly improves the efficiency and accuracy of centering the horizontal bubble of the small prism centering rod, reduces errors in bridge steel web installation caused by leveling errors of the forward-looking small prism centering rod, improves the efficiency and accuracy of measurement work, saves labor costs and ensures personnel safety, guarantees the quality of segmental beam steel web installation, and enables the bridge axis to be completed with minimal deviation.

[0042] This invention is not limited to the above-described preferred embodiments. In all respects, it is merely an example for illustration. Any products of various forms and types made by anyone under the guidance of this invention, without being limited to structural forms and variations, or using the same or similar technical solutions, are all included in this invention.

Claims

1. A method for bridge steel web lofting, using a bridge steel web lofting device, the device comprising a total station, a prism, a small-prism centering-rod rapid-leveling device, the small-prism centering-rod rapid-leveling device comprising an upper centering rod, a small prism, a lower centering rod, a T-shaped connecting rod, a nut, a rope clamp, a U-shaped bolt, a hinged lug, a horizontal bubble seat, an upper limiting nut, an upper pull rod, an adjusting rod, a lower pull rod, a lower limiting nut, the small prism being fixedly connected to the upper centering rod at the upper end and being provided with the horizontal bubble seat, and being fixedly connected to the lower centering rod at the lower end, the upper centering rod being fixedly connected to the rope clamp through the U-shaped bolt and the nut at the upper end, the U-shaped bolt being connected to the hinged lug through the upwardly-inclined T-shaped connecting rod at both sides, the hinged lug being welded with the upper pull rod below, the upper pull rod being threadedly connected to the lower pull rod through the adjusting rod, the bottom of the lower pull rod being welded with a strong magnetic attraction device along the axis, characterized in that, The method comprises the following steps: Step one, erect the total station instrument on the control point, level the electronic horizontal bubble of the total station instrument, input the coordinate data of the survey station and the back sight point; Step two, erect the prism at the back sight point and level its horizontal bubble, the prism is aligned with the direction of the total station instrument; Step three, the total station instrument aims at the back sight prism to perform observation orientation, select the third point to check its precision; Step four, erect the small prism at the central axis control point of the steel web, rotate the small prism through the left and right adjusting rods, quickly level the small prism, the direction of the small prism is aligned with the total station instrument; Step five, the survey personnel collect the coordinate data through the total station instrument aiming at the small prism, compare the actual measured coordinate data of the central axis of the steel web with the design theoretical data, guide the installation and positioning of the steel web, until the installation error checking meets the design requirements.

2. The method of bridge steel web lofting according to claim 1, characterized in that: The strong magnetic device is fixed on the bottom of the lower pull rod in a hinged manner.

3. The method of bridge steel web lofting according to claim 1, characterized in that: The upper centering rod can freely pass through the U-shaped bolt, the rope clamping component is installed, and the upper centering rod is fixed on the U-shaped bolt by hand screwing.

4. The method of bridge steel web lofting of claim 1, wherein: The threads of the upper pull rod and the lower pull rod are opposite in rotation direction, and are respectively connected with the left-hand threads and right-hand threads at the two ends of the adjusting rod.

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