Method for measuring arching of large-span aluminum template

Abstract

The invention belongs to the field of detection, and particularly discloses a method for measuring arching of a large-span aluminum template, which comprises the following steps: S1, mounting a measuring device; s2, a measuring mechanism for detecting the arching height of the aluminum formwork is installed in the container; s3, a proper amount of clear water is injected into the container, and the liquid level of the clear water is located between the top face of the fixing plate and the highest point of the aluminum formwork after arching; s4, the measuring mechanism detects the vertical distance from the liquid level to a detection point on the aluminum template, then the difference between the fixed distance from the liquid level to the bottom end of the fixed plate and the measured vertical distance is obtained, and the difference value is recorded; and S5, sequentially measuring the subsequent detection points according to the step S4, and making differences between every two detection points to obtain the height difference of each detection point so as to obtain the arching value of the aluminum template. According to the invention, the arching value of the aluminum template can be conveniently and rapidly detected, the detection is relatively easy, and the result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement, and particularly relates to a method for measuring the camber of large-span aluminum formwork. Background Art

[0002] Currently, in the field of building construction, concrete floors are mostly supported by formwork. With the increasing span of current building structure designs, the accuracy requirements for the camber of the supported formwork are also getting higher and higher. For large-span formwork, there should be camber in the middle part. If the camber is not in place, after pouring concrete, the middle part of the floor slab may locally deflect downward, affecting the aesthetics and safety of the building structure.

[0003] In the prior art, the detection method for camber is that on-site construction workers use a steel ruler to detect at the scaffolding part at the bottom of the formwork. The detection is not easy, and the detection result is not accurate. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for measuring the camber of large-span aluminum formwork, which can conveniently and quickly detect the camber value of the aluminum formwork, is relatively easy to detect, and the result is more accurate.

[0005] To solve the above technical problems, the present invention adopts the following solutions: A method for measuring the camber of large-span aluminum formwork includes the following steps: S1: Install a measuring device. The measuring device includes fixing plates installed on both sides of the aluminum formwork. The bottom ends of the fixing plates are flush with the top surface of the non-cambered aluminum formwork. A flexible waterproof membrane is connected between the two fixing plates. A container with an open top is formed between the flexible waterproof membrane and the two fixing plates. The bottom surface of the flexible waterproof membrane is attached to the top surface of the aluminum formwork. S2: Install a measuring mechanism for detecting the camber height of the aluminum formwork in the container. S3: Inject an appropriate amount of clear water into the container. The liquid level of the clear water is between the top surface of the fixing plate and the highest point after the aluminum formwork is cambered. S4: The measuring mechanism detects the vertical distance from the liquid level to the detection point on the aluminum formwork, then subtracts the measured vertical distance from the fixed distance from the liquid level to the bottom end of the fixing plate, and records the difference value. S5: According to S4, measure the subsequent detection points in sequence. Subtract the vertical distance from the detection point to the liquid level from the fixed distance from the liquid level to the bottom end of the fixing plate to obtain the elevation difference of each detection point, thereby obtaining the camber value of the aluminum formwork.

[0006] In this solution, after the measuring device is installed, a container with an open top is formed between the flexible waterproof membrane and the fixed plate. The flexible waterproof membrane at the bottom of the measuring device fits against the top surface of the aluminum formwork. After the aluminum formwork arches, its top surface forms an arched surface, and the flexible waterproof membrane at the bottom of the container also forms an arched shape. The flexible waterproof membranes on both sides of the container are in a taut state. Then, an appropriate amount of clear water is injected into the container. The water level is between the top surface of the fixed plate and the plane where the highest point of the arched aluminum formwork is located. The measuring mechanism can detect the vertical distance from the liquid level to the detection point on the arched aluminum formwork, and the fixed distance from the liquid level to the bottom end of the fixed plate can also be directly measured. This fixed distance is a constant value. If the liquid level is flush with the top end of the fixed plate, and the bottom end of the fixed plate and the top surface of the aluminum formwork before arching are on the same plane, 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, by subtracting the vertical distance from the fixed distance, the arching value of the detection point can be obtained. Then, the vertical distances of multiple subsequent detection points are measured in sequence, and the arching values are all obtained by subtracting the vertical distance from the fixed distance. This solution can conveniently and quickly detect the arching values of multiple points on the aluminum formwork, and the detection is relatively easy and the results are more accurate.

[0007] Optionally, before injecting clear water into the container, the flexible waterproof membrane at the bottom of the container needs to be straightened and the wrinkles eliminated.

[0008] Optionally, the measuring mechanism is a pressure sensor, and the pressure sensor is installed on the flexible waterproof membrane at the bottom of the container and corresponds to the detection point on the aluminum formwork.

[0009] Optionally, the pressure sensor is a waterproof pressure sensor.

[0010] Optionally, the pressure sensor measures the water pressure at the detection point, calculates the vertical distance from the detection point to the liquid level according to the formula, and then subtracts the vertical distance from the fixed distance from the liquid level to the bottom end of the fixed plate to obtain the arching height value of the detection point.

[0011] Optionally, the pressure sensor uses a waterproof thin-film pressure sensor or a flexible pressure sensor.

[0012] Optionally, the measuring mechanism is a measuring rod. There are scale lines on the measuring rod. The measuring rod moves along the arched path of the aluminum formwork to measure the height from the liquid level to the detection point, and then subtracts the measured height from the fixed distance from the liquid level to the bottom end of the fixed plate to obtain the arching height value of the detection point.

[0013] Optionally, a horizontal mounting seat is provided at the top end of the measuring rod. The mounting seat is perpendicular to the measuring rod, and a level is provided on the top surface of the mounting seat.

[0014] Optionally, the fixed distance from the liquid level to the bottom end of the fixed plate is equal to the height of the fixed plate minus the distance from the liquid level to the top end of the fixed plate.

[0015] The beneficial effects of the present invention are as follows: 1. In the present invention, after the measuring device is installed, a container with an open top is formed between the flexible waterproof membrane and the fixed plate. The flexible waterproof membrane on the bottom surface of the measuring device is attached to the top surface of the aluminum formwork. After the aluminum formwork arches, its top surface forms an arched surface, and the flexible waterproof membrane on the bottom surface of the container also forms an arched shape. The flexible waterproof membranes on both sides of the container are in a taut state. Then, an appropriate amount of clear water is injected into the container, and the clear water liquid level is located between the top surface of the fixed plate and the plane where the highest point of the arched aluminum formwork is located. After the clear water is stationary, the measuring mechanism can detect the vertical distance from the liquid level to the detection point on the arched aluminum formwork, and the fixed distance from the liquid level to the bottom end of the fixed plate can also be directly measured. This fixed distance is a fixed value. If the liquid level is flush with the top end of the fixed plate, and the bottom end of the fixed plate and the top surface of the aluminum formwork before arching are in the same plane, 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, by subtracting the vertical distance from the fixed distance, the arch value of the detection point can be obtained. Then, the vertical distances of subsequent multiple detection points are measured in sequence, and the arch values are all obtained by subtracting the vertical distance from the fixed distance. This solution can conveniently and quickly detect the arch values of multiple points on the aluminum formwork, the detection is relatively easy, and the results are more accurate. Description of the Drawings

[0016] Figure 1 Structural schematic diagram after the container is installed; Figure 2 Structural schematic diagram when the measuring mechanism is a pressure sensor; Figure 3 Structural schematic diagram when the measuring mechanism is a measuring rod; Figure 4 Structural schematic diagram when both sides of the container are a combination of a rigid plate and a flexible waterproof membrane.

[0017] Reference numerals: 1 - fixed plate, 2 - flexible waterproof membrane, 3 - aluminum formwork, 4 - container, 5 - pressure sensor, 6 - measuring rod, 7 - mounting seat, 8 - level, 9 - liquid level, 10 - rigid plate. Detailed Embodiments

[0018] The following combines embodiments and drawings to further elaborate on the present invention in detail, but the implementation manners of the present invention are not limited thereto.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "provided with", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Embodiment 1 A method for measuring the camber of a large-span aluminum formwork includes the following steps: S1: Install a measuring device. The measuring device includes fixing plates 1 installed on both sides of the aluminum formwork 3. The bottom ends of the fixing plates 1 are flush with the top surface of the non-cambered aluminum formwork 3. A flexible waterproof membrane 2 is connected between the two fixing plates 1. A container 4 with an open top is formed between the flexible waterproof membrane 2 and the two fixing plates 1. The bottom surface of the flexible waterproof membrane 2 is attached to the top surface of the aluminum formwork 3. S2: Install a measuring mechanism for detecting the camber height of the aluminum formwork 3 in the container 4. S3: Inject an appropriate amount of clear water into the container 4. The liquid level 9 of the clear water is between the top surface of the fixing plate 1 and the highest point after the aluminum formwork 3 is cambered. S4: The measuring mechanism detects the vertical distance from the liquid level 9 to the detection point on the aluminum formwork 3, then subtracts the measured vertical distance from the fixed distance from the liquid level 9 to the bottom end of the fixing plate 1, and records the difference. S5: According to S4, measure each subsequent detection point in turn. Subtract the vertical distance from the detection point to the liquid level 9 from the fixed distance from the liquid level 9 to the bottom end of the fixing plate 1 to obtain the elevation difference of each detection point, so as to obtain the camber value of the aluminum formwork 3.

[0022] In this embodiment, as Figure 1 shown, the fixing plates 1 are fixedly installed on the formwork on both sides of the aluminum formwork 3. The length of the flexible waterproof membrane 2 is adapted to the length of the cambered aluminum formwork 3. After the measuring device is installed, a container 4 with an open top is formed between the flexible waterproof membrane 2 and the fixing plates 1. The width of the container 4 should not be too wide. AsFigure 4 As shown, both sides of the container 4 can also be a combination of a rigid plate 10 and a flexible waterproof membrane 2. The upper part is the rigid plate 10 and the lower part is the flexible waterproof membrane 2. The flexible waterproof membrane 2 on the bottom surface of the measuring device is attached to the top surface of the aluminum formwork 3. After the aluminum formwork 3 arches, its top surface forms an arched surface, and the flexible waterproof membrane 2 on the bottom surface 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 water level 9 is located between the top surface of the fixed plate 1 and the plane where the highest point of the arched aluminum formwork 3 is located. The measuring mechanism can detect the vertical distance from the water level 9 to the detection point on the arched aluminum formwork 3, and the fixed distance from the water level 9 to the bottom end of the fixed plate 1 can also be directly measured. This fixed distance is a fixed value. If the water level 9 is flush with the top end of the fixed plate 1, and the bottom end of the fixed plate 1 and the top surface of the aluminum formwork 3 when not arched are on the same plane, then the fixed distance is the height of the fixed plate 1. If the water level 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 water level 9 to the top surface of the fixed plate 1. After obtaining the fixed distance, by subtracting the vertical distance from the fixed distance, the arching value of the detection point can be obtained. Then, the vertical distances of subsequent multiple detection points are measured in sequence, and the arching values are all obtained by subtracting the vertical distance from the fixed distance. This solution can conveniently and quickly detect the arching values of multiple points on the aluminum formwork 3, the detection is relatively easy, and the results are more accurate.

[0023] Further, before injecting clean water into the container 4, the flexible waterproof membrane 2 on the bottom surface of the container 4 needs to be straightened and the wrinkles eliminated.

[0024] Further, the measuring mechanism is a pressure sensor 5. The pressure sensor 5 is installed on the flexible waterproof membrane 2 at the bottom of the container 4 and corresponds to the detection point on the aluminum formwork 3.

[0025] Further, the pressure sensor 5 is a waterproof pressure sensor.

[0026] Further, the pressure sensor 5 measures the water pressure at the detection point, calculates the vertical distance from the detection point to the water level 9 according to the formula, and then subtracts the vertical distance from the fixed distance from the water level 9 to the bottom end of the fixed plate 1 to obtain the arching height value of the detection point.

[0027] Further, the pressure sensor 5 uses a waterproof thin-film pressure sensor or a flexible pressure sensor.

[0028] Specifically, as Figure 2As shown in the figure, the waterproof pressure sensor 5 is adopted in the measuring mechanism of this embodiment. The pressure sensors 5 are distributed according to the detection points on the aluminum formwork 3. The detection points are the installation positions of the pressure sensors 5 on the flexible waterproof film 2 at the bottom of the container 4. After 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 fixed plate 1. The fixed distance H from the liquid level 9 to the bottom end of the fixed plate 1 is the height of the fixed plate 1. That is, when the aluminum formwork 3 is in the non-arching state, the top surface of the aluminum formwork 3 and the bottom end of the fixed plate 1 are in the same plane, and the height of the liquid level 9 is the same as the height of the fixed plate 1. The pressure sensor 5 adopted is a thin-film pressure sensor 5, and its thickness can be as low as between a few hundred nanometers and dozens of micrometers. In this way, the thickness of the pressure sensor 5 can be ignored. Since the aluminum formwork 3 is arched, the bottom surface of the clean water is also arched. The heights from the pressure sensors 5 on the flexible waterproof film 2 to the liquid level 9 are different, and the liquid level 9 of the container 4 is a horizontal plane. According to the underwater pressure calculation formula (only considering water pressure) P = ρgh, h is the vertical distance from the liquid level 9 to the pressure sensor 5, and the pressure P can be directly measured by the pressure sensor 5. At this time, the value of h can be obtained. By subtracting h from H, the arching value h1 at the detection point of the aluminum formwork 3 can be obtained. If the thickness of the flexible film needs to be considered, then the thickness of the flexible film also needs to be subtracted, which depends on the actual thickness of the flexible film. If the film thickness is less than 1 mm, it can be ignored. If the liquid level 9 is lower than the top end of the fixed plate 1, then the distance from the liquid level 9 to the top surface of the fixed plate 1 needs to be measured, and then the distance between the liquid level 9 and the top end of the fixed plate 1 is subtracted to obtain H. In this embodiment, when measuring the arching values of each detection point, it is not necessary to measure the height of each detection point. The value of H is a fixed value. In this way, only by combining the readings of the pressure sensors 5 with the formula can the arching value be calculated. Then, the vertical distances of subsequent multiple detection points are calculated in turn, and the arching values are all obtained by subtracting the vertical distances from the fixed distance. This solution can conveniently and quickly detect the arching values of multiple points on the aluminum formwork 3, and the detection is relatively easy. Compared with manual measurement using a steel ruler, the result is also more accurate.

[0029] Embodiment 2 Further, the measuring mechanism is a measuring rod 6. Scale lines are provided on the measuring rod 6. The measuring rod 6 moves along the arched path of the aluminum formwork 3 to measure the height from the liquid level 9 to the detection point, and then the fixed distance from the liquid level 9 to the bottom end of the fixed plate 1 is subtracted from the measured height to obtain the arching height value of the detection point.

[0030] Further, a horizontal mounting seat 7 is provided at the top end of the measuring rod 6. The mounting seat 7 is perpendicular to the measuring rod 6, and a level 8 is provided on the top surface of the mounting seat 7.

[0031] Furthermore, the fixed distance from the liquid level 9 to the bottom end of the fixing plate 1 is equal to the height of the fixing plate 1 minus the distance from the liquid level 9 to the top end of the fixing plate 1. Specifically, since the fixed distance from the liquid level 9 to the bottom surface of the fixing plate 1 is related to the height of the liquid level 9, if the liquid level 9 is flush with the top surface of the fixing plate 1, then the fixed distance is the height of the fixing plate 1, which can be directly measured in the early stage. If the height of the liquid level 9 is lower than the top surface of the fixing plate 1, then the height difference between the liquid level 9 and the top surface of the fixing plate 1 needs to be measured, and the fixed distance is obtained by subtracting this height difference. Therefore, in order to reduce the measurement error caused by the number of measurements, it is the best choice that the liquid level 9 is flush with the top surface of the fixing plate 1.

[0032] As Figure 3 shown, this embodiment is another scheme for measuring the vertical distance from the liquid level 9 to the detection point. The measuring mechanism is a measuring rod 6. Scale lines are provided on the measuring rod 6 along its length direction. The height of the liquid level 9 is flush with the top surface of the fixing plate 1. The measuring rod 6 is a round rod or a square rod with a relatively thin diameter. In this way, the measuring rod 6 hardly affects the liquid level 9 after being inserted into the clear water. After the detection rod is inserted into the water, its bottom end is located at the detection point position. The level 8 on the mounting seat 7 is used to ensure the perpendicularity of the measuring rod 6. Then, the scale line reading at the intersection of the liquid level 9 and the measuring rod 6 is directly read from the measuring rod 6. This reading is the vertical distance h from the liquid level 9 to the detection point. The fixed distance H from the liquid level 9 to the bottom surface of the fixing plate 1 is directly obtained in the early stage. The camber value h1 is obtained by subtracting h from H. Subsequently, by placing the measuring rod 6 at different detection points, the camber values of multiple detection points can be obtained. Similarly, whether to subtract its thickness value according to the thickness of the flexible film is considered to determine the camber value.

[0033] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Based on the technical essence of the present invention, within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A measuring method for camber of large-span aluminum formwork, characterized in that It includes the following steps: S1: Install a measuring device. The measuring device includes fixing plates (1) installed on both sides of the aluminum formwork (3). The bottom ends of the fixing plates (1) are flush with the top surface of the non-arched aluminum formwork (3). A flexible waterproof membrane (2) is connected between the two fixing plates (1). A container (4) with an open top is formed between the flexible waterproof membrane (2) and the two fixing plates (1). The bottom surface of the flexible waterproof membrane (2) is attached to the top surface of the aluminum formwork (3). S2: Install a measuring mechanism for detecting the arch height of the aluminum formwork (3) in the container (4). S3: Inject an appropriate amount of clear water into the container (4). The liquid level (9) of the clear water is located between the top surface of the fixing plate (1) and the highest point after the aluminum formwork (3) arches. S4: The measuring mechanism detects the vertical distance from the liquid level (9) to the detection point on the aluminum formwork (3), then subtracts the measured vertical distance from the fixed distance from the liquid level (9) to the bottom end of the fixing plate (1), and records the difference. S5: According to S4, measure each subsequent detection point in turn. Subtract the vertical distance from the detection point to the liquid level (9) from the fixed distance from the liquid level (9) to the bottom end of the fixing plate (1) to obtain the elevation difference of each detection point, thereby obtaining the arch value of the aluminum formwork (3).

2. The measurement method for camber of large-span aluminum formwork according to claim 1, wherein Before injecting clear water into the container (4), the flexible waterproof membrane (2) at the bottom of the container (4) needs to be straightened to eliminate wrinkles.

3. A measuring method for camber of large-span aluminum formwork according to claim 1, characterized in that, The measuring mechanism is a pressure sensor (5). The pressure sensor (5) 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 formwork (3).

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

5. A measuring method for camber of 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 from the detection point to the liquid level (9) according to the formula, and then subtracts the vertical distance from the fixed distance from the liquid level (9) to the bottom end of the fixing plate (1) to obtain the arch height value of the detection point.

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

7. A method for measuring the camber of a long-span aluminum formwork according to claim 1, characterized in that, The measuring mechanism is a measuring rod (6). Scale lines are provided on the measuring rod (6). The measuring rod (6) moves along the arched path of the aluminum formwork (3) to measure the height from the liquid level (9) to the detection point, and then subtracts the measured height from the fixed distance from the liquid level (9) to the bottom end of the fixing plate (1) to obtain the arch height value of the detection point.

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

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

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