A flatness control structure and installation method for steel cap beam support pads

Abstract

This invention provides a flatness control structure and installation method for steel cap beam bearing pads, belonging to the field of bridge engineering construction technology. It solves the problem of limited space, where portable milling machines cannot be used, and bearing pads cannot be machined as a whole. The technical solution includes the following steps: Step 1, positioning and marking the bottom bearing pad; Step 2, pre-installation of the bottom bearing pad; Step 3, measurement of the elevation data of the bottom bearing pad; Step 4, machining the upper surface allowance of the bottom bearing pad; Step 5, installation of the bottom bearing pad; Step 6, installation of the upper bearing pad. The beneficial effects of this invention are: This solution improves the machining accuracy of the bearing pad by using a pre-installed bearing pad with overall marking and allowance machining; it improves the accuracy of the bearing pad repositioning installation by using installation inspection lines; and it shortens the machining cycle of traditional whole-piece marking and machining of bearing pads by processing single-layer, single-piece bearing pads, making the machining process more convenient.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a structure and installation method for controlling the flatness of a steel cap beam support pad. Background Technology

[0002] In the construction of steel bridges, bearing pads are a crucial link between precast beam segments and cap beams, serving as vital force transmission and leveling components. This necessitates that the installation and flatness control of bearing pads be extremely critical. With the development of precast steel structures, not only can large-span beam segments use steel structures to replace traditional concrete structures, but cap beams are also gradually shifting from concrete to steel structures. Consequently, the installation of bearing pads has moved from the bottom of precast steel bridge segments to the surface of steel cap beams. Traditionally, the installation of bearing pads at the bottom of steel beam segments involved leaving machining allowances, and after the steel beam segment was fabricated, the entire structure was marked and machined using a portable milling machine to control the flatness of the bearing pads. However, due to the limited dimensions of the steel cap beam structure, it is impossible to install a portable milling machine for machining during the installation of bearing pads in steel cap beams, rendering this installation method unsuitable. The support height of a concrete cap beam is adjusted by pouring concrete through secondary grouting, while the support height of a steel cap beam is adjusted by the height of the support pad. When the required support pad thickness is large, a single steel plate is insufficient, so a double layer of support pad is required.

[0003] How to solve the above-mentioned technical problems is the challenge facing this invention. Summary of the Invention

[0004] The purpose of this invention is to provide a structure and installation method for controlling the flatness of a steel cap beam support pad.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A flatness control structure for a steel cap beam support pad includes a support pad disposed on the surface of the steel cap beam, wherein the support pad includes a bottom support pad and an upper support pad.

[0007] An installation method based on a steel cap beam support pad flatness control structure includes the following steps:

[0008] Step 1, Marking and positioning the bottom support plate: After the steel cap beam is fabricated as a whole, mark the positioning lines on the upper surface of the steel cap beam, and measure the elevation data of the area where the support plate is installed on the upper surface of the steel cap beam. Calculate the machining allowance at the bottom of the bottom support plate based on the elevation data.

[0009] Step 2, Pre-installation of the bottom support pad: Based on the machining allowance calculated from the elevation data in Step 1, the bottom of the bottom support pad is machined, and preliminarily positioned on the upper surface of the steel cap beam according to the positioning line marked in Step 1.

[0010] Step 3, Measurement of elevation data of the bottom bearing pad: Use a total station to measure the elevation data of the area on the upper surface of the bottom bearing pad where the upper bearing pad is installed, and calculate the machining allowance on the upper surface of the bottom bearing pad based on the elevation data;

[0011] Step 4, machining the upper surface of the bottom support pad: Remove the bottom support pad, and machine the upper surface of the bottom support pad according to the machining allowance calculated based on the elevation data mentioned in Step 3, and drill holes.

[0012] Step 5, Installation of the bottom support pad: Install the bottom support pad according to the positioning lines marked in Step 1;

[0013] Step 6, Installation of upper support pad: Repeat the above steps to install the upper support pad.

[0014] Each support pad has a 10mm machining allowance before installation.

[0015] Before installing the bottom support pad in step one, the components at the steel cap beam support pad installation location need to be fire-tested, a fire-testing area is set up, and the flatness of the installation area and its surrounding 100mm range is controlled to not exceed 1mm / m.

[0016] In step two, when processing the bottom of the bottom support pad, processing can be stopped when the flatness of the bottom meets the requirement of 1mm / m, and the processing is about 2mm.

[0017] During assembly, the gap between the bottom surface of the bottom support pad and the surface of the steel cap beam component must be controlled to be ≤1mm.

[0018] In step three, the upper surface trimming allowance line and the reference line of the bearing pad hole group are drawn based on the elevation data of the upper surface of the bottom bearing pad.

[0019] When removing the bottom support pad in step four, directional markings and installation inspection lines should be made on the bottom support pad.

[0020] In the steps described above, when installing the bottom support pad, a counterweight block needs to be added to the upper part of the top support pad to control welding deformation. Welding should be symmetrical, and the installation inspection line and direction mark point should be checked. The misalignment of the installation inspection line should be ≤0.5mm.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The flatness control structure and precise installation method of the steel cap beam bearing pad provided by this solution overcome the problem that portable milling machines cannot be used and the bearing pad cannot be machined as a whole under space constraints; the machining accuracy of the bearing pad is improved by the pre-installed bearing pad with the overall scribing allowance line; the accuracy of the bearing pad repositioning installation is improved by the installation inspection line; and the machining of single-layer, single-piece bearing pads shortens the machining cycle of the traditional overall scribing machining of bearing pads and makes the machining more convenient. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the double-layer support pad according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the flatness control area for the support pad installation in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the marking of the allowance of the bottom support pad in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram illustrating the installation of inspection lines and direction markers in an embodiment of the present invention.

[0028] The attached diagram is labeled as follows: 1. Steel cap beam; 2. Bearing pad; 201. Bottom bearing pad; 202. Upper bearing pad; 4. Fire test area; 5. Trimming allowance line; 6. Direction marker point; 7. Installation inspection line. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Example 1

[0031] See Figure 1 and Figure 5 The present invention provides a technical solution as follows: a flatness control structure for a steel cap beam support pad, comprising a support pad 2 disposed on the surface of a steel cap beam 1, the support pad 2 comprising a bottom support pad 201 and an upper support pad 202.

[0032] An installation method based on a steel cap beam support pad flatness control structure includes the following steps:

[0033] Step 1, positioning and marking of the bottom support pad 201: After the steel cap beam 1 is fabricated as a whole, the positioning lines are marked on the upper surface of the steel cap beam 1, and the elevation data of the area where the support pad is installed on the upper surface of the steel cap beam 1 is measured. The machining allowance at the bottom of the bottom support pad 201 is calculated based on the elevation data.

[0034] Step 2, Pre-installation of the bottom support plate 201: Based on the machining allowance calculated from the elevation data in Step 1, the bottom of the bottom support plate 201 is machined and preliminarily positioned on the upper surface of the steel cap beam 1 according to the positioning line marked in Step 1.

[0035] Step 3, Measurement of elevation data of bottom support plate 201: Use a total station to measure the elevation data of the area on the upper surface of the bottom support plate 201 where the upper support plate 202 is installed, and calculate the machining allowance of the upper surface of the bottom support plate 201 based on the elevation data.

[0036] Step 4, machining the allowance on the upper surface of the bottom support pad 201: Remove the bottom support pad 201, and machine the allowance on the upper surface of the bottom support pad 201 according to the machining allowance calculated from the elevation data in Step 3, and drill holes.

[0037] Step 5, Installation of bottom support pad 201: Install the bottom support pad 201 according to the positioning lines marked in Step 1;

[0038] Step 6, Installation of upper support pad 202: Repeat the above steps to install the upper support pad 202.

[0039] Before installation, each bearing pad 2 should have a machining allowance of 10mm.

[0040] Before installing the bottom support pad 201 in step one, the components at the location where the support pad 2 is installed on the steel cap beam 1 need to be fire-tested. A fire-testing area 4 is set up, and the flatness of the installation area and its surrounding 100mm range is controlled to not exceed 1mm / m.

[0041] Step 2: When machining the bottom of the bottom support plate 201, machining can be stopped when the flatness of the bottom meets the requirement of 1mm / m. Machining should be completed by about 2mm.

[0042] During assembly, the gap between the bottom surface of the bottom support pad 201 and the surface of the steel cap beam 1 component must be controlled to be ≤1mm.

[0043] In step three, the upper surface trimming allowance line 5 and the reference line of the hole group of the support plate are drawn according to the elevation data of the upper surface of the bottom support plate 201.

[0044] When removing the bottom support pad 201 in step four, directional marking point 6 and installation inspection line 7 should be made on the bottom support pad 201.

[0045] In step 5, when installing the bottom support pad 201, a counterweight block needs to be added to the upper part of the upper support pad 202 to control welding deformation. Welding should be symmetrical, and the installation inspection line 7 and direction mark point 6 should be checked. The misalignment of the installation inspection line 7 should be ≤0.5mm.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An installation method for a steel cap beam support pad flatness control structure, characterized in that, Includes the following steps: Step 1, positioning and marking of the bottom support pad (201): After the steel cap beam (1) is manufactured as a whole, the positioning line is marked on the upper surface of the steel cap beam (1), and the elevation data of the area where the support pad (2) is installed on the upper surface of the steel cap beam (1) is measured. The machining allowance of the bottom of the bottom support pad (201) is calculated based on the elevation data. Step 2, Pre-installation of the bottom support pad (201): Based on the machining allowance calculated from the elevation data in Step 1, the bottom of the bottom support pad (201) is machined and preliminarily positioned on the upper surface of the steel cap beam (1) according to the positioning line marked in Step 1. Step 3, Measurement of elevation data of bottom support pad (201): Use a total station to measure the elevation data of the area on the upper surface of the bottom support pad (201) where the upper support pad (202) is installed, and calculate the machining allowance of the upper surface of the bottom support pad (201) based on the elevation data; Step 4, machining the allowance on the upper surface of the bottom support pad (201): Remove the bottom support pad (201), and machine the allowance on the upper surface of the bottom support pad (201) according to the machining allowance calculated based on the elevation data described in Step 3, and drill holes. Step 5, Installation of the bottom support pad (201): Install the bottom support pad (201) according to the positioning line marked in Step 1. Step 6, Installation of upper support pad (202): Repeat steps 1 to 5 above to install the upper support pad (202). The flatness control structure of the steel cap beam support pad includes a support pad (2) set on the surface of the steel cap beam (1), and the support pad (2) includes a bottom support pad (201) and an upper support pad (202).

2. The installation method of the steel cap beam support pad flatness control structure according to claim 1, characterized in that, Before installation, each of the support pads (2) has a machining allowance of 10mm.

3. The installation method of the steel cap beam support pad flatness control structure according to claim 1, characterized in that, Before installing the bottom support pad (201) in step one, the components at the installation support pad (2) of the steel cap beam (1) need to be fire-tested, and a fire-testing area (4) needs to be set up to control the flatness of the installation area and its surrounding 100mm range to not exceed 1mm / m.

4. The installation method of the steel cap beam support pad flatness control structure according to claim 1, characterized in that, When processing the bottom of the bottom support pad (201) in step two, processing should be stopped when the flatness of the bottom meets the requirement of 1mm / m, and the processing should be about 2mm. During the assembly process, the gap between the bottom surface of the bottom support pad (201) and the surface of the steel cap beam (1) component must be controlled to be ≤1mm.

5. The installation method of the steel cap beam support pad flatness control structure according to claim 1, characterized in that, In step three, the upper surface trimming allowance line (5) and the reference line of the hole group of the support plate are drawn according to the elevation data of the upper surface of the bottom support plate (201).

6. The installation method of the steel cap beam support pad flatness control structure according to claim 1, characterized in that, When removing the bottom support pad (201) in step four, directional marking points (6) and installation inspection lines (7) should be made on the bottom support pad (201).

7. The installation method of the steel cap beam support pad flatness control structure according to claim 6, characterized in that, In step five, when installing the bottom support pad (201), in order to control welding deformation, a counterweight block needs to be added to the upper part of the upper support pad (202). Welding should be symmetrical, and the installation inspection line (7) and direction mark point (6) should be checked. The misalignment of the installation inspection line (7) should be ≤0.5mm.

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