Device and method for elevation measurement in confined space for precast column installation

Abstract

This invention relates to an apparatus and method for elevation measurement in confined spaces during the installation of precast columns. A PTFE (polytetrafluoroethylene) plate component is placed on the top surface of the lower column section to adjust the elevation and flatness of the reference surface. A vernier caliper is used to check the thickness of the PTFE plate component and measure the required height of the shim. A reflective marker is attached to the upper column section to mark the elevation measurement target. A tripod is used to mount a measuring robot. The measuring robot is placed on a stable location outside the foundation pit to measure the column elevation. This invention solves the problem of elevation measurement when space is limited during the installation of the upper section of a precast column, making leveling impossible. By innovating traditional leveling methods and adding a new device, it completes the elevation measurement task in confined spaces during the installation of precast columns, offering advantages such as high operability, high measurement accuracy, fast and efficient operation, effective protection of worker safety, and improved construction progress.

Description

Technical Field

[0001] This invention relates to a technique for elevation measurement in a confined space for prefabricated column installation, specifically an apparatus and method for elevation measurement in a confined space for prefabricated column installation. Background Technology

[0002] With the accelerating pace of urban renewal, the quality and progress of construction projects are closely related to residents' happiness index. In the context of a low-carbon and environmentally friendly society, green construction is receiving increasing attention, and prefabrication technology is being widely applied in engineering projects. Compared to previous open-site construction and traditional processes, prefabrication technology places stricter demands on surveying, requires more precise control, faster surveying efficiency, and more flexible and diverse surveying techniques.

[0003] During the assembly of precast columns, conventional measurement methods are significantly constrained by site space limitations. Traditional measuring instruments and methods are cumbersome, time-consuming, require numerous support personnel, and pose substantial safety hazards, all of which negatively impact construction progress and technical quality assurance. Therefore, it is essential to reform and innovate traditional measuring instruments and methods during precast column assembly, and this technical challenge must be continuously updated and refined in practice. Summary of the Invention

[0004] This invention addresses the bottlenecks in measurement technology under the aforementioned working conditions by providing a device and method for elevation measurement within the confined space of precast column installation. This solution overcomes the problems of cumbersome work, long measurement times, large personnel requirements, and significant safety hazards associated with traditional measuring instruments and methods. When conducting measurement work within the confined space of precast column installation, the innovative device and method offer speed, convenience, controllable accuracy, reduced costs, and time savings, enabling efficient completion of measurement work and ensuring construction progress.

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

[0006] A device for measuring the elevation of prefabricated columns in a confined space includes a measuring robot, a reflective measuring marker, a tripod, a PTFE plate component, and a vernier caliper. The PTFE plate component is placed on the top surface of the lower column section to adjust the elevation and flatness of the reference surface. The vernier caliper is used to check the thickness of the PTFE plate component and measure the required height of the shim. The reflective measuring marker is affixed to the upper column section to mark the measurement points. The tripod is used to mount the measuring robot. The measuring robot is placed on a stable location outside the foundation pit to measure the elevation of the column.

[0007] Furthermore, the measuring robot has the functions of automatically searching for measurement targets and measuring without prisms. It can continuously search for and lock the position of the measuring point within the sensing range, and can measure and display the measured elevation data in real time.

[0008] Furthermore, the reflective measuring target has both measurable and reflective functions, can be flat or side-attached to the column body, and is not easily bent or slipped off.

[0009] Furthermore, the PTFE plate component is a high-strength and high-toughness component with various specifications and sizes, and the precision is controlled by different thicknesses.

[0010] Furthermore, the vernier caliper is a high-precision caliper that is quick and convenient to use.

[0011] Furthermore, the tripod is made of wood, which is heavy and has good stability.

[0012] A method for measuring elevation in a confined space during prefabricated column installation, employing a device for measuring elevation in a confined space during prefabricated column installation, with the specific operating steps as follows:

[0013] Step 1: For the qualified columns, attach reflective markers around the column body at the same height, and choose to attach them flat or sideways according to the field observation field.

[0014] Step 2: Select four reference surfaces on the top surface of the installed lower column and place PTFE plate components of the same thickness on them;

[0015] Step 3: Based on the construction site conditions, select a point outside the rounded corner of the column and set up the measuring robot;

[0016] Step 4: The prefabricated column is installed, and the measuring robot conducts real-time observation; the height difference is calculated based on the elevation of the two sides of the column measured by the measuring robot, and the thickness of the PTFE plate component with the same height difference is measured with a vernier caliper. The thickness is increased or decreased accordingly until the height difference between the two sides is zero, the verticality of the prefabricated column meets the specification requirements, and the installation is completed.

[0017] Step 5: Move the measuring robot to the other opposite corner, observe the elevation of the remaining two sides, perform additional observations to ensure accuracy requirements, and then end the measurement task.

[0018] The beneficial effects of this invention are:

[0019] This invention solves the problems of being unable to use a level due to limited line-of-sight height; being unable to set up a ruler and prism due to limited installation space for double-section prefabricated columns; and the problems of traditional methods being time-consuming and posing personnel safety risks. The device and method of this invention are convenient and quick to operate, precise and efficient, and rigorous and scientific, enabling rapid and efficient completion of measurement work, ensuring construction progress, and guaranteeing that the technical quality of prefabricated column installation meets standards. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dimensions of the PTFE sheet component;

[0021] Wherein, (a) is a square plane, and (b) is a cross-section of various thicknesses;

[0022] Figure 2 This is a schematic diagram of a reflection measurement target;

[0023] Figure 3 This is a schematic diagram showing the setup of the measuring robot and the tripod.

[0024] Figure 4 This is a schematic diagram illustrating the method of elevation measurement in a confined space for prefabricated column installation;

[0025] Figure 5 This is a flowchart of the elevation measurement device and method for prefabricated column installation in a confined space. Detailed Implementation

[0026] The implementation method of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figures 1 to 3 As shown, a device for measuring elevation in a confined space during the installation of prefabricated columns includes a PTFE plate component 3, a reflective measuring mark 4, a vernier caliper, a tripod 2, and a measuring robot 1. The tripod 2 is used to mount the measuring robot 1, providing stability and connection; the measuring robot 1 is used to determine the vertical orientation of the prefabricated column during installation; the reflective measuring mark 4 is attached to the column body to reflect measurement data and calibrate the reference position of the measurement point; the PTFE plate component 3 is used to adjust the elevation data; and the vernier caliper is used to check and measure the thickness of the PTFE plate component 3.

[0028] like Figure 1 As shown in (a) and (b), the PTFE sheet component 3 is square in size, and the thickness includes various specifications. Several PTFE sheets of each specification should be prepared.

[0029] Figure 2 The reflective marker 4 has a self-adhesive function, allowing it to be applied flat to the column or sideways. When side-applying the reflective marker, attention should be paid to its stability; certain stabilizing measures can be taken, such as limiting measures, back reinforcement measures, drilling holes, and nailing. The reflective marker has cross markings and horizontal engravings to indicate and specify the target being measured for different data. The reflective marker also has the infrared light reflection function of a rangefinder.

[0030] Figure 3 The middle tripod 2 is made of wood, which is heavy, stable, and non-slip. The top surface of the tripod has a central connecting screw for connecting to upper equipment.

[0031] The measuring robot 1 has an automatic search function. The measuring robot also features prism-free measurement capabilities.

[0032] like Figure 4 As shown, a specific implementation method for elevation measurement in a confined space for prefabricated column installation is as follows:

[0033] Preliminary preparations include the reasonable arrangement of the site layout, the inspection and verification of the measuring robot, the acceptance of the prefabricated columns upon arrival, and the quantity and performance checks of the equipment used.

[0034] Affix reflective markers to the bottom of the accepted columns, with the markers on all four sides equidistant from the bottom of the column.

[0035] Set up a tripod along the extension line of any rounded corner of the column, at a suitable distance for observation, and the top surface should be roughly horizontal; step down on the three foot pedals a few times to make sure they are firmly planted on the ground and do not slip.

[0036] The measuring robot is mounted on a tripod and the connection is tightened using the center connecting screw.

[0037] Turn on the instrument's built-in leveling function and use the three leveling screws on the base to precisely level the measuring robot, ensuring that the deviation is 00°00′00″ within a 360° range.

[0038] Adjust the temperature, air pressure, and other information stored in the instrument according to the actual weather conditions.

[0039] Turn on the automatic target search function of the measurement robot and adjust the measurement mode to prism-free mode.

[0040] The measurement robot learns to measure by first observing the reflective marker points on one pillar, then observing the other, clearly defining the order. The observation target can be either the center point mark or the long horizontal line of the reflective marker, ensuring the observation positions on both sides are identical. If the target is the horizontal line of the reflective marker, the single filament of the crosshair in the measurement robot's telescope must perfectly align with the horizontal line to ensure no parallax exists.

[0041] Based on the measurement data, calculate the height difference between the reflection targets on the two surfaces; based on the calculated height difference, determine the adjustment position and height.

[0042] Based on the adjusted height, select PTFE sheets of the same height. Try to choose whole PTFE sheets of the same thickness. If there are no components of the same height, you can use combinations of other thicknesses to achieve the required thickness, with the principle of minimizing the number of components. The thickness of the components is checked and measured with vernier calipers.

[0043] Component mounting pads are used for measurement, and a measuring robot tracks and measures the components.

[0044] Repeat the installation process of observation, calculation, and adjustment until the elevation measurements on both surfaces are the same and the elevation difference is zero.

[0045] The measuring robot was moved to the extended line diagonally opposite the column, placed, and leveled.

[0046] Observe the reflection targets on the other two surfaces. If there is a height difference, make fine adjustments; if there is no height difference, the adjustment is in place.

[0047] If no adjustments are needed after inspection, it indicates that the post installation measurement data is accurate, and the flatness and verticality are up to standard, thus completing the measurement work.

[0048] For the precisely positioned columns, the hooks are unhooked and tightened to complete the installation of the prefabricated columns.

[0049] The embodiments described above are merely descriptions of the good practical application of the present invention and are not intended to limit the scope of the invention in any way. Without departing from the spirit of the invention, the use of other substitute materials or descriptive methods defined in other languages ​​should not be excluded from the protection scope of the present invention.

Claims

1. A method for measuring elevation in a confined space during prefabricated column installation, employing a device for measuring elevation in a confined space during prefabricated column installation. This device includes a measuring robot, a reflective measuring marker, a tripod, a PTFE plate component, and a vernier caliper. The PTFE plate component is placed on the top surface of the lower column section to adjust the elevation and flatness of the reference surface. The vernier caliper is used to check the thickness of the PTFE plate component and measure the required height of the shim. The reflective measuring marker is affixed to the upper column section to mark the measurement points for elevation measurement. The tripod is used to mount the measuring robot. The measuring robot is placed on a stable location outside the foundation pit to measure the column elevation. The measuring robot has automatic target search and prism-free measurement functions, continuously searching and locking the measurement point position within its sensing range, and can measure and display the measured elevation data in real time. The reflective measuring marker has both measurable and reflective functions, is flat and side-attached to the column body, and is not easily bent or slipped. The device is characterized by... The specific steps of this method are as follows: Step 1: For the qualified columns, attach reflective markers around the column body at the same height, and choose to attach them flat or sideways according to the field observation field. Step 2: Select four reference surfaces on the top surface of the installed lower column and place PTFE plate components of the same thickness on them; Step 3: Based on the construction site conditions, select a point outside the rounded corner of the column and set up the measuring robot; Step 4: The prefabricated column is installed, and the measuring robot conducts real-time observation; the height difference is calculated based on the elevation of the two sides of the column measured by the measuring robot, and the thickness of the PTFE plate component with the same height difference is measured with a vernier caliper. The thickness is increased or decreased accordingly until the height difference between the two sides is zero, the verticality of the prefabricated column meets the specification requirements, and the installation is completed. Step 5: Move the measuring robot to the other opposite corner, observe the elevation of the remaining two sides, perform additional observations to ensure accuracy requirements, and then end the measurement task.

2. The method for measuring elevation in a confined space during prefabricated column installation according to claim 1, characterized in that: The PTFE plate component is a high-strength and high-toughness component with various specifications and sizes, and the precision is controlled by different thicknesses.

3. The method for measuring elevation in a confined space during prefabricated column installation according to claim 1, characterized in that: The vernier caliper is a high-precision caliper that is quick and convenient to use.

4. The method for measuring elevation in a confined space during prefabricated column installation according to claim 1, characterized in that: The tripod is made of a heavy and stable wooden structure.

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