A method for measuring the camber of large-span aluminum formwork

Abstract

This invention belongs to the field of testing, specifically disclosing a method for measuring the arching of large-span aluminum formwork, including the following steps: S1: Install a measuring device; S2: Install a measuring mechanism for detecting the arching height of the aluminum formwork inside a container; S3: Inject an appropriate amount of clean water into the container, with the water level between the top surface of the fixed plate and the highest point of the arched aluminum formwork; S4: The measuring mechanism measures the vertical distance from the water surface to the detection point on the aluminum formwork, then the difference between the fixed distance from the water surface to the bottom of the fixed plate and the measured vertical distance is recorded; S5: Based on S4, subsequent measurements are performed at each detection point, and the difference is calculated pairwise to obtain the height difference of each detection point, thereby obtaining the arching value of the aluminum formwork. This invention can conveniently and quickly detect the arching value of aluminum formwork, the detection is relatively easy, and the results are more accurate.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and specifically to a method for measuring the arching of large-span aluminum formwork. Background Technology

[0002] Currently, in the construction industry, concrete floor slabs are mostly supported by formwork. As the span of modern building structures becomes larger and larger, the accuracy requirements for the arching of the formwork are also becoming higher and higher. For large-span formwork, there should be arching in the middle. If the arching is not in place, the floor slab may deflect locally in the middle after the concrete is poured, affecting the aesthetics and safety of the building structure.

[0003] The existing method for detecting arching involves on-site construction workers using a steel ruler to measure the arching at the bottom of the scaffolding of the formwork. This method is difficult to implement and the results are inaccurate. Summary of the Invention

[0004] The purpose of this invention is to provide a method for measuring the arching of large-span aluminum formwork, which can conveniently and quickly detect the arching value of aluminum formwork, making the detection easier and the results more accurate.

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

[0006] A method for measuring the camber of large-span aluminum formwork includes the following steps:

[0007] S1: Install a measuring device, which includes fixed plates installed on both sides of the aluminum formwork. The bottom of the fixed plates is flush with the top surface of the unarched aluminum formwork. A flexible waterproof membrane is connected between the two fixed plates. The flexible waterproof membrane and the two fixed plates form a container with an open top. The bottom surface of the flexible waterproof membrane is in contact with the top surface of the aluminum formwork.

[0008] S2: Install a measuring mechanism inside the container to detect the arching height of the aluminum formwork;

[0009] S3: Pour an appropriate amount of clean water into the container, with the water level between the top surface of the fixed plate and the highest point after the aluminum template arches.

[0010] S4: The measuring mechanism detects the vertical distance from the liquid surface to the detection point on the aluminum template, and then the difference between the fixed distance from the liquid surface to the bottom of the fixed plate and the measured vertical distance is recorded.

[0011] S5: Based on S4, measure each subsequent detection point in sequence. Calculate the difference between the vertical distance from the detection point to the liquid surface and the fixed distance from the liquid surface to the bottom of the fixed plate to obtain the height difference of each detection point, thereby obtaining the arching value of the aluminum template.

[0012] In this scheme, after the measuring device is installed, the flexible waterproof membrane and the fixing plate form a container with an open top. The flexible waterproof membrane on the bottom of the measuring device is attached to the top surface of the aluminum template. After the aluminum template arches, its top surface forms an arched surface, and the flexible waterproof membrane on the bottom of the container also forms an arched shape. The flexible waterproof membranes on both sides of the container are taut. Then, an appropriate amount of clean water is injected into the container. The water level is located between the top surface of the fixing plate and the plane where the highest point of the arched aluminum template is located. The measuring mechanism can detect the vertical distance from the water level to the detection point on the arched aluminum template, and the fixed distance from the water level to the bottom of the fixing plate can also be directly measured. The fixed distance is a constant value. If the liquid level is flush with the top of the fixed plate, and the bottom of the fixed plate is on the same plane as the top surface of the aluminum template before arching, then the fixed distance is the height of the fixed plate. If the liquid level is lower than the top surface of the fixed plate, then the fixed distance is the height of the fixed plate minus the distance from the liquid level to the top surface of the fixed plate. After obtaining the fixed distance, the arching value of the detection point can be obtained by subtracting the vertical distance from the fixed distance. Then, the vertical distances of multiple subsequent detection points are measured in sequence, and the arching value is obtained by subtracting the vertical distance from the fixed distance. This method can conveniently and quickly detect the arching value of multiple points on the aluminum template. The detection is relatively easy and the results are more accurate.

[0013] Optionally, before filling the container with water, the flexible waterproof membrane on the bottom of the container should be smoothed and wrinkles eliminated.

[0014] Optionally, the measuring mechanism is a pressure sensor, which is installed on a flexible waterproof membrane at the bottom of the container, and the pressure sensor corresponds to the detection point on the aluminum template.

[0015] Optionally, the pressure sensor is a waterproof pressure sensor.

[0016] Optionally, the pressure sensor measures the water pressure at the detection point, calculates the vertical distance from the detection point to the liquid surface according to the formula, and then subtracts the vertical distance from the fixed distance from the liquid surface to the bottom of the fixed plate to obtain the arching height of the detection point.

[0017] Optionally, the pressure sensor may be a waterproof thin-film pressure sensor or a flexible pressure sensor.

[0018] Optionally, the measuring mechanism is a measuring rod with scale lines. The measuring rod moves along the arched path of the aluminum template to measure the height of the liquid surface to the detection point. The arch height of the detection point is obtained by subtracting the measured height from the fixed distance from the liquid surface to the bottom of the fixed plate.

[0019] Optionally, the top of the measuring rod is provided with a horizontal mounting base, which is perpendicular to the measuring rod, and a level is provided on the top surface of the mounting base.

[0020] Optionally, the fixed distance from the liquid surface to the bottom of the fixed plate is equal to the height of the fixed plate minus the distance from the liquid surface to the top of the fixed plate.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. In this invention, after the measuring device is installed, the flexible waterproof membrane and the fixing plate form a container with an open top. The flexible waterproof membrane on the bottom of the measuring device is attached to the top surface of the aluminum template. After the aluminum template arches, its top surface forms an arched surface, and the flexible waterproof membrane on the bottom of the container also forms an arched shape. The flexible waterproof membranes on both sides of the container are taut. Then, an appropriate amount of clean water is injected into the container. The water level is located between the top surface of the fixing plate and the plane where the highest point of the arched aluminum template is located. After the water settles, the measuring mechanism can detect the vertical distance from the water level to the detection point on the arched aluminum template, and the fixed distance from the water level to the bottom of the fixing plate can also be directly measured. The fixed distance is a constant value. If the liquid level is flush with the top of the fixed plate, and the bottom of the fixed plate is on the same plane as the top surface of the aluminum template before arching, then the fixed distance is the height of the fixed plate. If the liquid level is lower than the top surface of the fixed plate, then the fixed distance is the height of the fixed plate minus the distance from the liquid level to the top surface of the fixed plate. After obtaining the fixed distance, the arching value of the detection point can be obtained by subtracting the vertical distance from the fixed distance. Then, the vertical distances of multiple subsequent detection points are measured in sequence, and the arching value is obtained by subtracting the vertical distance from the fixed distance. This method can conveniently and quickly detect the arching value of multiple points on the aluminum template. The detection is relatively easy and the results are more accurate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the container's structure after installation.

[0024] Figure 2 This is a schematic diagram of a pressure sensor as the measuring mechanism.

[0025] Figure 3 This is a schematic diagram of a measuring mechanism consisting of a measuring rod.

[0026] Figure 4 This is a schematic diagram of a container structure consisting of rigid plates on both sides and a flexible waterproof membrane.

[0027] Reference numerals: 1-Fixed plate, 2-Flexible waterproof membrane, 3-Aluminum template, 4-Container, 5-Pressure sensor, 6-Measuring rod, 7-Mounting base, 8-Level, 9-Liquid level, 10-Rigid plate. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1

[0032] A method for measuring the camber of large-span aluminum formwork includes the following steps:

[0033] S1: Install a measuring device. The measuring device includes a fixing plate 1 installed on both sides of the aluminum template 3. The bottom end of the fixing plate 1 is flush with the top surface of the aluminum template 3 that is not arched. A flexible waterproof membrane 2 is connected between the two fixing plates 1. The flexible waterproof membrane 2 and the two fixing plates 1 form a container 4 with an open top. The bottom surface of the flexible waterproof membrane 2 is in contact with the top surface of the aluminum template 3.

[0034] S2: Install a measuring mechanism inside container 4 to detect the arching height of aluminum template 3;

[0035] S3: Pour an appropriate amount of clean water into container 4, with the water level 9 positioned between the top surface of fixed plate 1 and the highest point of the aluminum template 3 after arching.

[0036] S4: The measuring mechanism detects the vertical distance from the liquid surface 9 to the detection point on the aluminum template 3, and then the difference between the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 and the measured vertical distance is recorded.

[0037] S5: Based on S4, measure each subsequent detection point in sequence. Calculate the difference between the vertical distance from the detection point to the liquid surface 9 and the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 to obtain the height difference of each detection point, thereby obtaining the arching value of the aluminum template 3.

[0038] In this embodiment, as Figure 1As shown, the fixing plate 1 is installed and fixed on the templates on both sides of the aluminum template 3. The length of the flexible waterproof membrane 2 is adapted to the length of the arched aluminum template 3. After the measuring device is installed, the flexible waterproof membrane 2 and the fixing plate 1 form a container 4 with an open top. The width of the container 4 should not be too wide. Figure 4 As shown, the container 4 can also be a combination of rigid plates 10 and flexible waterproof membranes 2 on both sides, with rigid plates 10 on the top and flexible waterproof membranes 2 on the bottom. The flexible waterproof membrane 2 on the bottom of the measuring device is attached to the top surface of the aluminum template 3. After the aluminum template 3 arches, its top surface forms an arched surface, and the flexible waterproof membrane 2 on the bottom of the container 4 also forms an arched shape. The flexible waterproof membranes 2 on both sides of the container 4 are in a taut state. Then, an appropriate amount of clean water is injected into the container 4. The clean water level 9 is located between the top surface of the fixed plate 1 and the plane where the highest point of the aluminum template 3 is after arching. The measuring mechanism can detect the vertical distance from the liquid level 9 to the detection point on the arched aluminum template 3, and the fixed distance from the liquid level 9 to the bottom of the fixed plate 1 can also be directly measured. The fixed distance is a constant value. If the liquid surface 9 is flush with the top of the fixed plate 1, and the bottom of the fixed plate 1 is on the same plane as the top surface of the aluminum template 3 when it is not arched, then the fixed distance is the height of the fixed plate 1. If the liquid surface 9 is lower than the top surface of the fixed plate 1, then the fixed distance is the height of the fixed plate 1 minus the distance from the liquid surface 9 to the top surface of the fixed plate 1. After obtaining the fixed distance, the arching value of the detection point can be obtained by subtracting the vertical distance from the fixed distance. Then, the vertical distances of multiple subsequent detection points are measured in sequence, and the arching value is obtained by subtracting the vertical distance from the fixed distance. This solution can conveniently and quickly detect the arching value of multiple points on the aluminum template 3. The detection is relatively easy and the results are more accurate.

[0039] Furthermore, before injecting clean water into container 4, the flexible waterproof membrane 2 on the bottom surface of container 4 needs to be smoothed out and wrinkles eliminated.

[0040] Furthermore, the measuring mechanism is a pressure sensor 5, which is installed on the flexible waterproof membrane 2 at the bottom of the container 4, and the pressure sensor 5 corresponds to the detection point on the aluminum template 3.

[0041] Furthermore, the pressure sensor 5 is a waterproof pressure sensor.

[0042] Furthermore, the pressure sensor 5 measures the water pressure at the detection point, calculates the vertical distance between the detection point and the liquid surface 9 according to the formula, and then subtracts the vertical distance from the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 to obtain the arching height value of the detection point.

[0043] Furthermore, the pressure sensor 5 is a waterproof thin-film pressure sensor or a flexible pressure sensor.

[0044] Specifically, such as Figure 2As shown, the measuring mechanism in this embodiment uses a waterproof pressure sensor 5. The pressure sensor 5 is distributed according to the detection points on the aluminum template 3. The detection points are the installation positions of the pressure sensor 5 on the flexible waterproof membrane 2 at the bottom of the container 4. When an appropriate amount of clean water is injected into the container 4, in this embodiment, the liquid level 9 of the clean water is directly flush with the top surface of the fixing plate 1. The fixed distance H from the liquid level 9 to the bottom of the fixing plate 1 is the height of the fixing plate 1. This is equivalent to the aluminum template 3 being in an un-arched state, with the top surface of the aluminum template 3 and the bottom of the fixing plate 1 on the same plane, and the height of the liquid level 9 being the same as the height of the fixing plate 1. The pressure sensor 5 is a thin-film pressure sensor 5, and its thickness can be as low as several hundred nanometers to tens of micrometers. In this way, the pressure is transmitted... The thickness of sensor 5 is negligible. Since the aluminum template 3 is arched, the bottom surface of the clear water is also arched. The heights of the pressure sensors 5 on the flexible waterproof membrane 2 from the liquid surface 9 are different, while the liquid surface 9 of the container 4 is a horizontal plane. According to the underwater pressure calculation formula (considering only water pressure), P=ρgh, h is the vertical distance from the liquid surface 9 to the pressure sensor 5. The pressure P can be directly measured by the pressure sensor 5, thus obtaining the value of h. By subtracting h from H, the arching value h1 at the detection point of the aluminum template 3 is obtained. If the thickness of the flexible membrane needs to be considered, then the thickness of the flexible membrane also needs to be subtracted. This depends on the actual thickness of the flexible membrane. If the membrane thickness is less than 1mm, it can be ignored. If the liquid surface 9 is lower than the top of the fixed plate 1, then the distance from the liquid surface 9 to the top surface of the fixed plate 1 needs to be measured again, and then the distance between the liquid surface 9 and the top of the fixed plate 1 is subtracted to obtain H. In this embodiment, when measuring the camber value at each detection point, it is not necessary to measure the height of each detection point. The H value is a fixed value, so the camber value can be calculated simply by combining the reading of the pressure sensor 5 with the formula. Then, the vertical distances of subsequent detection points are calculated sequentially, and the camber value is obtained by subtracting the vertical distance from the fixed distance. This solution can conveniently and quickly detect the camber value of multiple points on the aluminum template 3. The detection is relatively easy, and the results are more accurate compared to manual measurement with a steel ruler.

[0045] Example 2

[0046] Furthermore, the measuring mechanism is a measuring rod 6, which has scale lines. The measuring rod 6 moves along the arched path of the aluminum template 3 to measure the height of the liquid surface 9 to the detection point. Then, the measured height is subtracted from the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 to obtain the arch height value of the detection point.

[0047] Furthermore, the top of the measuring rod 6 is provided with a horizontal mounting base 7, which is perpendicular to the measuring rod 6, and a level 8 is provided on the top surface of the mounting base 7.

[0048] Furthermore, the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 is equal to the height of the fixed plate 1 minus the distance from the liquid surface 9 to the top of the fixed plate 1. Specifically, since the fixed distance from the liquid surface 9 to the bottom of the fixed plate 1 is related to the height of the liquid surface 9, if the liquid surface 9 is flush with the top surface of the fixed plate 1, then the fixed distance is the height of the fixed plate 1, which can be obtained by directly measuring the height of the fixed plate 1 in the early stage. If the height of the liquid surface 9 is lower than the top surface of the fixed plate 1, then it is necessary to measure the height difference between the liquid surface 9 and the top surface of the fixed plate 1, and then subtract this height difference to obtain the fixed distance. Therefore, in order to reduce the measurement error caused by the number of measurements, it is optimal to choose the liquid surface 9 to be flush with the top surface of the fixed plate 1.

[0049] like Figure 3 As shown, this embodiment presents another method for measuring the vertical distance from the liquid surface 9 to the detection point. The measuring mechanism is a measuring rod 6, which has scale lines along its length. The height of the liquid surface 9 is flush with the top surface of the fixed plate 1. The measuring rod 6 is a round or square rod with a relatively thin diameter, so that the measuring rod 6 will hardly affect the liquid surface 9 after being inserted into clean water. After the detection rod is inserted into the water, its bottom end is located at the detection point. The verticality of the measuring rod 6 is ensured by the level 8 on the mounting base 7. Then, the scale line reading at the intersection of the liquid surface 9 and the measuring rod 6 is read directly from the measuring rod 6. This reading is the vertical distance h from the liquid surface 9 to the detection point. The fixed distance H from the liquid surface 9 to the bottom surface of the fixed plate 1 is obtained directly in the early stage. The difference between H and h is used to obtain the arching value h1. Subsequently, by placing the measuring rod 6 at different detection points, the arching value of multiple detection points can be obtained. Similarly, the thickness of the flexible film is considered to determine whether it is necessary to subtract its thickness value to determine the arching value.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for measuring the camber of large-span aluminum formwork, characterized in that, Includes the following steps: S1: Install a measuring device. The measuring device includes a fixing plate (1) installed on both sides of the aluminum template (3). The bottom of the fixing plate (1) is flush with the top surface of the aluminum template (3) without arching. A flexible waterproof membrane (2) is connected between the two fixing plates (1). The flexible waterproof membrane (2) and the two fixing plates (1) form a container (4) with an open top. The bottom surface of the flexible waterproof membrane (2) is attached to the top surface of the aluminum template (3). S2: Install a measuring mechanism inside the container (4) to detect the arching height of the aluminum template (3); S3: Pour an appropriate amount of clean water into the container (4), and the water level (9) is located between the top surface of the fixed plate (1) and the highest point of the aluminum template (3) after arching; S4: The measuring mechanism detects the vertical distance from the liquid surface (9) to the detection point on the aluminum template (3), and then the fixed distance from the liquid surface (9) to the bottom of the fixed plate (1) is compared with the measured vertical distance, and the difference is recorded. S5: Based on S4, the subsequent measurement of each detection point is carried out in sequence. The difference between the vertical distance from the detection point to the liquid surface (9) and the fixed distance from the liquid surface (9) to the bottom of the fixed plate (1) is calculated to obtain the height difference of each detection point, thereby obtaining the arching value of the aluminum template (3).

2. The method for measuring the camber of large-span aluminum formwork according to claim 1, characterized in that, Before injecting clean water into the container (4), the flexible waterproof membrane (2) on the bottom of the container (4) should be smoothed and wrinkles eliminated.

3. The method for measuring the camber of large-span aluminum formwork according to claim 1, characterized in that, The measuring mechanism is a pressure sensor (5), which is installed on the flexible waterproof membrane (2) at the bottom of the container (4). The pressure sensor (5) corresponds to the detection point on the aluminum template (3).

4. The method for measuring the camber of large-span aluminum formwork according to claim 3, characterized in that, The pressure sensor (5) is a waterproof pressure sensor.

5. The method for measuring the camber of a large-span aluminum formwork according to claim 3, characterized in that, The pressure sensor (5) measures the water pressure at the detection point, calculates the vertical distance between the detection point and the liquid surface (9) according to the formula, and then subtracts the vertical distance from the fixed distance from the liquid surface (9) to the bottom of the fixed plate (1) to obtain the arching value of the detection point.

6. The method for measuring the camber of a large-span aluminum formwork according to claim 3, characterized in that, The pressure sensor (5) is a waterproof thin-film pressure sensor or a flexible pressure sensor.

7. The method for measuring the camber of a large-span aluminum formwork according to claim 1, characterized in that, The measuring mechanism is a measuring rod (6), which has scale lines. The measuring rod (6) moves along the arched path of the aluminum template (3) to measure the height of the liquid surface (9) to the detection point. The measured height is then subtracted from the fixed distance from the liquid surface (9) to the bottom of the fixed plate (1) to obtain the arch value of the detection point.

8. The method for measuring the camber of a large-span aluminum formwork according to claim 7, characterized in that, The measuring rod (6) has a horizontal mounting base (7) at its top end. The mounting base (7) is perpendicular to the measuring rod (6), and a level (8) is provided on the top surface of the mounting base (7).

9. The method for measuring the camber of a large-span aluminum formwork according to claim 1, characterized in that, The fixed distance from the liquid surface (9) to the bottom of the fixed plate (1) is equal to the height of the fixed plate (1) minus the distance from the liquid surface (9) to the top of the fixed plate (1).

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