Membrane cloth sound insulation amount construction site testing device and method for air membrane sky curtain

Abstract

The invention discloses a film cloth sound insulation amount construction site testing device and method for an air film awning, and relates to the technical field of dust prevention and noise reduction of building construction, and the technical scheme is that the device comprises a testing vehicle, a testing box, an angle adjusting device and a sound level measurer; the test box is carried on the test vehicle through the angle adjusting device; a sound level measurer is arranged in the test box, and one side of the test box is provided with a box body opening for covering the film cloth; under the assistance of the angle adjusting device, the box body opening of the test box is aligned with the noise source direction. The air film material sound insulation amount testing device and the sound insulation amount calculation method based on the construction site condition are provided, the sound insulation amount of the film cloth material can be effectively determined, air film skyscreen design material selection is guided, the efficiency is high, the cost is low, and the guiding effect is strong. The device and the method are feasible and easy to popularize, and have very high practical significance.

Description

Technical Field

[0001] The invention relates to the technical field of dust prevention and noise reduction in building construction, and in particular to a device and method for testing the volume insulation of a membrane cloth used for an air film skylight on site. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, in the process of urban construction, dust and noise control mostly adopts measures such as sprinklers, fog cannons, dust nets, and sound barriers, and the control effect is unsatisfactory. Especially for urban renewal construction, the construction site is often adjacent to residential areas, commercial areas, hospitals, schools and other crowded places. Dust and noise emissions exceed the standard, seriously affecting the lives and work of residents. Complaints are common, and the resulting suspension of work for rectification occurs from time to time, making night construction even more difficult. Against this background, the "air film skylight" was proposed, which uses air film materials in combination with other structures to cover the construction area to achieve dust and noise reduction effects. At present, this air film skylight has been successfully used in scenes such as urban building foundation pits and subway foundation pits. It can effectively control dust and also shows great potential for noise reduction.

[0004] Generally speaking, the sound insulation of the air film material itself is directly related to the noise reduction effect of the air film canopy. In the design process of the air film canopy, the selection of reasonable air film materials is of great significance to reducing costs and improving the comprehensive performance of the canopy. At present, the sound insulation of the air film mainly adopts the laboratory test method, which requires the air film material to be large in size, long in implementation time and high in cost. In addition, there are certain errors in the guidance of the air film sound insulation test results. For example, in the laboratory test, 16 noise frequencies between 100Hz-3150Hz can be selected to obtain the sound insulation of the air film material respectively, and then the numerical calculation method or curve comparison method is used to comprehensively evaluate the sound insulation of the material. Due to the large difference between the laboratory test conditions and the construction site conditions, for example, the noise emitted by a certain construction machinery is mainly concentrated in the mid-frequency area (400-1000Hz). If the material sound insulation of the laboratory test (100Hz-3150Hz) is used for evaluation, it will cause a large error. Therefore, it is very necessary to develop a method for quickly testing the sound insulation performance of air film materials at the construction site to guide the design and selection of air film canopies. Summary of the invention

[0005] In order to achieve the above-mentioned purpose of the invention and to address the above-mentioned technical problems, the present invention provides a construction site testing device and method for the volume insulation sound of membrane cloth for air film canopy, aiming to quickly obtain the volume insulation sound of different membrane cloths at the construction site, guide the design of air film canopy, and achieve the goals of improving quality and reducing costs.

[0006] The technical solution is a construction site testing device for the sound insulation of membrane cloth for air film canopy, including a testing vehicle, a testing box, an angle adjustment device and a sound level measuring device;

[0007] The test box is mounted on the test vehicle through an angle adjustment device; the test box has a built-in sound level meter, and one side is set as a box opening to cover the membrane cloth;

[0008] With the help of the angle adjustment device, the opening of the test box is aligned with the direction of the noise source;

[0009] The sound level meter measures the noise level of typical working conditions at the construction site under two conditions: without membrane cloth and covered with membrane cloth, to obtain the sound insulation volume of the membrane cloth; then the sound insulation volume of the membrane cloth in the superposition state of multiple typical working conditions is obtained through calculation.

[0010] The test vehicle includes a vehicle plate, wheels and a vehicle back. The vehicle plate is a flat structure supported by four wheels. The vehicle back is fixed to the edge of one side of the vehicle plate. The vehicle back is a metal rod assembly structure with a handlebar at the top for manual pushing. A cross bar is arranged in the middle of the vehicle back, which can be used to support the test box with the opening facing upward.

[0011] The test box is composed of a box body and a fixed cover; the box body is a hexahedral box body with an opening on one side, including a metal shell, a sound insulation material as a sound insulation lining, the sound insulation lining is arranged on the inner wall of the metal shell, and a first support is arranged on the outer edge side of the metal shell close to the box body opening;

[0012] A fixing frame is arranged in the box body on the bottom surface of the box body opposite to the box body opening, for fixing the sound level measuring device;

[0013] The fixed cover is a frame structure matched with the box opening, and the fixed cover is provided with a second support platform; the edge of the box opening is tightly fitted with the second support platform; the first support platform and the second support platform are matched with bolt holes, and each side is provided with multiple bolt holes, which can be fastened with bolts;

[0014] The box opening can be covered with a membrane cloth, compressed with a fixing cover, and fastened with bolts.

[0015] The angle adjustment device comprises a slide rail, a slide cylinder and a support frame;

[0016] There are two slide rails, which are arranged symmetrically; each slide rail is arc-shaped, one end of the arc rail is fixed to the vehicle plate, and the other end is fixed to the vehicle back rod; each rail is provided with a slide cylinder, which is fixedly connected to the side wall of the test box, and each slide cylinder is provided with a tightening knob, which can press and fix the slide cylinder and the slide rail; the support frame is fixed to the vehicle plate, and the upper end of the support frame is rotatably connected to the bottom edge of the test box.

[0017] The test box uses the bottom edge as the axis and performs rotational motion on the slide rail through the slide cylinder. After the required angle is adjusted, it is fixed by tightening the knob to complete the alignment of the box opening and the noise source.

[0018] The sound level meter is preferably a sound level meter with a data wireless transmission function. The noise level is measured in A-weighted sound level in dB(A). The noise measurement data is transmitted to an external receiving device for viewing, storage and processing.

[0019] The testing method based on the membrane cloth sound insulation construction site testing device for the air film canopy comprises the following steps:

[0020] S1. For typical working conditions Ci (i=1, 2, 3, ...) of noise emission at the construction site, place the test device between the noise source and the noise-sensitive area around the construction site, and at the edge of the construction site; adjust the box opening to align with the direction of the noise source and fix it with a tightening knob;

[0021] S2. Under the condition of no film covering, conduct noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i1 ;

[0022] S3. Release the test box, adjust the test box to face the opening upward, and place the bottom of the box directly on the crossbar on the back of the car; cover the box opening with a film cloth and fix it with a fixing cover; then adjust the test box opening to face the direction of the noise source and fix it with a tightening knob;

[0023] S4. Under the condition of membrane cloth covering, conduct noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i2 ;

[0024] S5. Obtain the air film sound insulation value TL under the typical working condition Ci (i)(n＝1) =L i1 -L i2 ;

[0025] S6. The calculation equation for the air film sound insulation under m typical working conditions is:

[0026]

[0027] S7. Count the total construction time T0 during which noise emission exceeds the standard. According to the difference in typical noise emission conditions, the total construction time T0 is divided into several time periods Ti (i=1, 2, 3, ...). Each time period may contain only one typical noise emission condition or a superposition of multiple typical conditions.

[0028] According to steps S5 and S6, the sound insulation of the air film in each time period Ti is calculated, and then weighted according to the time proportion to obtain the sound insulation TN of the air film in T0;

[0029] S8. The volume isolation TN obtained after calculation can be evaluated and classified as follows, in dB(A):

[0030] When TN<10, the sound insulation performance is poor and should not be selected;

[0031] When 10≤TN≤20, the sound insulation performance is average and is determined according to the sound insulation requirements;

[0032] When TN>20, the sound insulation performance is excellent and it is recommended to give priority to it.

[0033] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0034] (1) Providing a testing device and method under construction site conditions: In view of the limitations of existing laboratory testing methods, the present invention provides a device and method for testing the sound insulation of air film materials based on construction site conditions. The device can quickly and accurately measure the sound insulation of the membrane material at the construction site, solving the problem of test result errors caused by the difference between laboratory testing conditions and construction site conditions.

[0035] (2) Efficient and low-cost testing solution: Compared with the traditional laboratory testing method, the testing device of the present invention has a simple structure and is easy to operate. It can quickly complete the test at the construction site, greatly shortening the test time and reducing the test cost. At the same time, the mobility of the testing device enables it to be flexibly applied to different construction sites, improving the test efficiency.

[0036] (3) Guiding the design and material selection of air-film canopies: Through the testing device and method of the present invention, the actual sound insulation performance of different membrane materials at the construction site can be accurately obtained, which provides a scientific basis for the design and material selection of air-film canopies, helps to select cost-effective membrane materials, reduce project costs, and improve the comprehensive performance of air-film canopies.

[0037] (4) Practical and easy to promote: The testing device and method of the present invention are simple to operate, have low requirements for equipment and site, and are applicable to various construction site environments. The test results are highly instructive and practical, can effectively solve the problem of dust and noise control at the construction site, have high practical significance, and are easy to promote and apply in the industry.

[0038] (5) Solving the problems of the prior art: The present invention aims to solve the problems existing in the laboratory testing method mentioned in the background technology, such as the large difference between the testing conditions and the construction site, the high testing cost, the long testing time, etc., and provides a fast, accurate and low-cost construction site testing solution, which can effectively determine the sound insulation value of the membrane cloth material, guide the design and material selection of the air film skylight, and solve the technical problems existing in the prior art.

[0039] In summary, the beneficial effects of the present invention are not only reflected in providing an efficient and low-cost construction site testing device and method, but also in that it can effectively solve the limitations of existing laboratory testing methods, provide a scientific basis for the design and material selection of air film skylights, and has strong practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the overall structure of the testing device according to an embodiment of the present invention.

[0041] Figure 2 It is a cross-sectional view of a test box according to an embodiment of the present invention.

[0042] Figure 3 It is a side view of the test box according to the embodiment of the present invention.

[0043] Figure 4 This is a diagram of the preparation state of installing a membrane cloth on the test box according to an embodiment of the present invention.

[0044] Among them, the accompanying drawings are marked as follows: 1. test box; 11. box body; 111. first support platform; 112. bolt; 113. metal shell; 114. sound insulation lining; 115. fixing frame; 12. fixing cover; 121. second support platform; 13. box opening; 14. box bottom; 2. angle adjustment device; 21. support frame; 22. slide rail; 23. slide cylinder; 231. tightening knob; 3. test vehicle; 31. vehicle plate; 32. wheel; 33. vehicle back; 331. cross bar; 332. handlebar; 4. sound level meter; 5. membrane cloth. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0049] Example 1

[0050] See also Figures 1 to 4 The present invention provides a construction site testing device for the volume insulation of membrane cloth for air film skylights, comprising a test vehicle 3, a test box 1, an angle adjustment device 2 and a sound level meter. The test box is mounted on the test vehicle through the angle adjustment device; the test box has a built-in sound level meter 4, and one side is set as a box opening to cover the membrane cloth. With the assistance of the angle adjustment device, the box opening of the test box is aligned with the direction of the noise source; the sound level meter measures the noise level of typical working conditions of the construction site under two conditions: without membrane cloth and covered with membrane cloth, and obtains the volume insulation of the membrane cloth; then the volume insulation of the membrane cloth in the superposition state of multiple typical working conditions is obtained by calculation.

[0051] The test vehicle 3 includes a vehicle plate 31, wheels 32 and a vehicle back 33. The vehicle plate is a flat structure supported by four wheels. The vehicle back is fixed to the edge of one side of the vehicle plate. The vehicle back is a metal rod assembly structure with a handlebar 332 at the top for manual pushing. A cross bar 331 is provided in the middle of the vehicle back to support the test box with the opening facing upward.

[0052] The test box 1 is composed of a box body 11 and a fixed cover 12. The box body is a hexahedral box body with an opening on one side, including a metal shell 113, a sound insulation material as a sound insulation lining 114, and the sound insulation lining 114 is arranged on the inner wall of the metal shell 113. A first support 111 is arranged on the outer edge side of the metal shell 113 near the box body opening 13; in the box body, a fixing frame 115 is arranged on the bottom surface 14 of the box body opposite to the box body opening, for fixing the sound level meter 4. The fixed cover is a frame structure matched with the box body opening, and is provided with a second support 121; the edge of the box body opening can be tightly fitted with the second support; the first support and the second support are matched with bolt holes, and two bolt holes are arranged on each side, and are fastened with bolts 112.

[0053] The box opening can be covered with a membrane cloth 5, pressed with a fixing cover, and fastened with bolts.

[0054] The angle adjustment device 2 includes a slide rail 22, a slide cylinder 23 and a support frame 21; there are two slide rails, arranged symmetrically; each slide rail is arc-shaped, one end of the arc rail is fixed to the vehicle plate 31, and the other end is fixed to the vehicle back 33 rod. Each track is provided with a slide cylinder, which is fixedly connected to the side wall of the test box, and each slide cylinder is provided with a tightening knob 231, which can press and fix the slide cylinder and the slide rail. The support frame 21 is fixed to the vehicle plate, and the upper end of the support frame is pin-connected to the edge of the bottom of the test box.

[0055] Furthermore, the test box can use the pin shaft as the axis and rotate along the slide rail through the slide cylinder. After adjusting the required angle, the tightening knob 231 is turned to fix the slide cylinder to complete the alignment of the box opening and the noise source.

[0056] The sound level meter has the function of wireless data transmission. The noise level adopts A-weighted sound level in dB(A). The noise measurement data is transmitted to external mobile phones, computers and other devices for viewing, storage and processing.

[0057] The test method based on the membrane cloth sound insulation construction site test device for air film canopy includes the following steps:

[0058] S1. For typical working conditions Ci (i=1, 2, 3, ...) of noise emission at the construction site, place the test device between the noise source and the noise-sensitive area around the construction site, and at the edge of the construction site; adjust the box opening 13 to align with the direction of the noise source, and fix it with the tightening knob 231;

[0059] S2. Under the condition of no film cloth 5 covering, conduct noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i1 ;

[0060] S3, release the test box 1, adjust the test box 1 to open upward, and place the bottom surface 14 of the box directly on the crossbar 331 of the car back 33; cover the box opening 13 with a film cloth 5 and fix it with a fixing cover 12; then adjust the opening of the test box 1 to align with the direction of the noise source, and fix it with a tightening knob 231;

[0061] S4. Under the condition of membrane cloth 5 covering, conduct a noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i2 ;

[0062] S5. Obtain the air film sound insulation value TL under the typical working condition Ci (i)(n＝1) =L i1 -L i2 ;

[0063] S6. The calculation equation for the air film sound insulation under m typical working conditions is:

[0064]

[0065] S7. Count the total construction time T0 during which noise emission exceeds the standard. According to the difference in typical noise emission conditions, the total construction time T0 is divided into several time periods Ti (i=1, 2, 3, ...). Each time period may contain only one typical noise emission condition or a superposition of multiple typical conditions.

[0066] According to steps S5 and S6, the sound insulation of the air film in each time period Ti is calculated, and then weighted according to the time proportion to obtain the sound insulation TN of the air film in T0;

[0067] S8. The volume isolation TN obtained after calculation can be evaluated and classified as follows, in dB(A):

[0068] When TN<10, the sound insulation performance is poor and should not be selected;

[0069] When 10≤TN≤20, the sound insulation performance is average and is determined according to the sound insulation requirements;

[0070] When TN>20, the sound insulation performance is excellent and it is recommended to give priority to it.

[0071] Example 2

[0072] Taking the construction of a subway station in a city as an example, during the foundation pit engineering stage, the typical noise conditions are as follows:

[0073]

[0074]

[0075] The measurement method disclosed in the present invention is:

[0076] S1. For working condition C1, place the test device between the noise source and the noise-sensitive area around the construction site, and at the edge of the construction site; adjust the opening of the test box to face the noise source and fix it with the tightening knob;

[0077] S2. Under the condition of no film covering, conduct noise intensity test for no less than 10 minutes, record and store the test data, and calculate the average value L 11 =94.1dB(A);

[0078] S3. Release the test box, adjust the test box to face the opening upward, and place the bottom of the box directly on the crossbar on the back of the vehicle; cover the opening with a Class E membrane material (membrane cloth) and fix it with a fixing cover; then adjust the opening of the test box to face the direction of the noise source and fix it with a tightening knob;

[0079] S4. Under the condition of membrane cloth covering, conduct noise intensity test for no less than 10 minutes, record and store the test data, and calculate the average value L 12 =71.4dB(A);

[0080] S5. The calculated sound insulation value of the air film under the typical working condition C1 is TL (i＝1)(n＝1) =L 11 -L 12 =22.7dB(A);

[0081] Using the same method, the sound insulation of a certain type E membrane material (membrane cloth) under 5 working conditions is obtained as follows:

[0082] Noise conditions Primary Sources <![CDATA[L i1 dB(A)]]> <![CDATA[L i2 dB(A)]]> <![CDATA[TL (i＝1)(n＝1) dB(A)]]> C1 Pile foundation construction 93.1 70.4 22.7 C2 Excavation construction 91.4 68.2 23.2 C3 welding 84.5 58.5 26.0 C4 Steel bar cutting and cage forming 83.6 64.8 18.8 C5 Vehicle transportation 86.7 69.4 17.3

[0083] S6. According to the construction process analysis, there will be superposition of the four working conditions of C1, C3, C4 and C5, and there will also be superposition of the four working conditions of C2, C3, C4 and C5. The time of other superposition states is very small and can be ignored. The calculation of the air film sound insulation under the superposition of the four working conditions of C1, C3, C4 and C5 is:

[0084]

[0085] =10log(10 9.31 +10 8.45 +10 8.36 +10 8.67 )-10log(10 7.04 +10 5.85 +10 6.48 +10 6.94 )

[0086] =21.1dB(A)

[0087] Similarly, the air film sound insulation under the superposition of the four working conditions of C2, C3, C4 and C5 is calculated as follows:

[0088]

[0089] S7. According to statistics, the total duration of noise emission exceeding the standard during the foundation pit phase of this project is T0 = 360 days. According to the differences in typical working conditions of noise emission, the total duration T0 is divided into several time periods, as shown in the following table:

[0090] Time period Included conditions Duration (d) Sound insulation(dB(A)) Time percentage (%) T1 C1 17 22.7 4.7 T2 C2 34 23.2 9.4 T3 C5 10 17.3 2.8 T4 C1, C3, C4, C5 97 21.1 26.9 T5 C2, C3, C4, C5 202 20.9 56.1

[0091] The sound insulation value TN of a certain type E membrane material (membrane cloth) used in this project within T0 is calculated as follows:

[0092] TN=22.7×4.7%+23.2×9.4%+17.3×2.8%+21.1×26.9%+20.9×56.1%=21.1dB(A)

[0093] S8. Classify according to the following evaluation (unit: dB(A)):

[0094] When TN<10, the sound insulation performance is poor and should not be selected;

[0095] When 10≤TN≤20, the sound insulation performance is average and is determined according to the sound insulation requirements;

[0096] When TN>20, the sound insulation performance is excellent and it is recommended to give priority to it.

[0097] Obviously, the sound insulation value of a certain Class E membrane material (membrane cloth) in this project is 21.1dB (A), and its sound insulation effect is excellent. It is recommended to give priority to its use.

[0098] This technical solution can realize the rapid testing and evaluation of the sound insulation of membrane materials under construction site conditions, provide a strong reference for guiding the design of air membrane skylights, and is highly practical and easy to promote.

[0099] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction site testing device for the sound insulation of membrane cloth for air film canopy, characterized in that: It comprises a test vehicle (3), a test box (1), an angle adjustment device (2) and a sound level measuring device; The test box (1) is mounted on a test vehicle (3) via an angle adjustment device (2); the test box (1) has a built-in sound level meter, and one side is provided with a box opening (13) for covering the membrane cloth (5); With the aid of the angle adjustment device (2), the test box (1) is oriented so that the box opening (13) is aligned with the direction of the noise source; The sound level meter measures the noise level of typical working conditions at the construction site under two conditions: without membrane cloth and covered with membrane cloth, to obtain the sound insulation volume of the membrane cloth; then the sound insulation volume of the membrane cloth in the superposition state of multiple typical working conditions is obtained through calculation.

2. The on-site testing device for measuring the sound insulation of membrane cloth for air film canopy according to claim 1, characterized in that: The test vehicle (3) comprises a vehicle plate (31), wheels (32) and a vehicle back (33); the vehicle plate (31) is a flat structure supported by four wheels (32); the vehicle back (33) is fixedly connected to one side edge of the vehicle plate (31); the vehicle back (33) is a metal rod assembly structure, and a handlebar (332) is arranged at the top for manual pushing; a crossbar (331) is arranged in the middle of the vehicle back (33) for supporting the test box (1) in an upwardly opened state.

3. The on-site testing device for the volume insulation of the membrane cloth used for the air film canopy according to claim 1, characterized in that: The test box (1) is composed of a box body (11) and a fixed cover (12); the box body (11) is a hexahedral box body with an opening on one side, comprising a metal shell (113), a sound insulation material as a sound insulation lining (114), the sound insulation lining (114) is arranged on the inner wall of the metal shell (113), and a first support platform (111) is arranged on the outer edge side of the metal shell (113) close to the box body opening (13); A fixing frame (115) is provided in the box body (11) on the bottom surface (14) of the box body opposite to the box body opening (13) for fixing the sound level measuring device; The fixed cover (12) is a frame structure matched with the box opening (13), and the fixed cover (12) is provided with a second support platform (121); the edge of the box opening (13) is tightly fitted with the second support platform (121); the first support platform (111) and the second support platform (121) are matched to be provided with bolt holes, and each side is provided with a plurality of bolt holes, which can be fastened with bolts (112); The box opening (13) can be covered with a membrane cloth (5), compressed by a fixing cover (12), and fastened by bolts (112).

4. The on-site testing device for measuring the sound insulation of membrane cloth for air film canopy according to claim 3, characterized in that: The angle adjustment device (2) comprises a slide rail (22), a slide cylinder (23) and a support frame (21); There are two slide rails (22) arranged symmetrically; each slide rail (22) is arc-shaped, one end of the arc rail is fixedly connected to the vehicle plate (31), and the other end is fixedly connected to the vehicle back (33) rod; each rail is provided with a slide cylinder (23), the slide cylinder (23) is fixedly connected to the side wall of the test box (1), and each slide cylinder (23) is provided with a tightening knob (231), which can press and fix the slide cylinder (23) and the slide rail (22); the support frame (21) is fixedly connected to the vehicle plate (31), and the upper end of the support frame (21) is rotatably connected to the bottom edge of the test box (1).

5. The on-site testing device for the volume insulation of the membrane cloth used for the air film canopy according to claim 4, characterized in that: The test box (1) uses the bottom edge as an axis and performs rotational motion on the slide rail (22) through a slide cylinder (23). After the required angle is adjusted, it is fixed by tightening the knob (231) to complete the alignment of the box opening (13) and the noise source.

6. The on-site testing device for measuring the sound insulation of membrane cloth for air film canopy according to claim 1, characterized in that: The sound level measuring device is preferably a sound level meter (4) with a data wireless transmission function. The noise level is measured using an A-weighted sound level in units of dB(A). The noise measurement data is transmitted to an external receiving device for viewing, storage and processing.

7. A testing method for the membrane cloth sound insulation construction site testing device for air film canopy based on any one of claims 1 to 6, characterized in that: The following steps are involved: S1. For a typical noise emission condition Ci (i=1, 2, 3, ...) at a construction site, the test device is placed between the noise source and the noise-sensitive area around the construction site, and at the edge of the construction site; the box opening (13) is adjusted to be aligned with the direction of the noise source, and is fixed using a tightening knob (231); S2. Under the condition of no film cloth (5) covering, conduct a noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i1 ; S3, release the test box (1), adjust the test box (1) to face the opening upward, and place the bottom surface (14) of the box directly on the crossbar (331) of the vehicle back (33); cover the box opening (13) with a membrane cloth (5), and fix it with a fixing cover (12); then adjust the opening of the test box (1) to face the direction of the noise source, and fix it with a tightening knob (231); S4. Under the condition of membrane cloth (5) covering, conduct a noise intensity test for a certain period of time, record and store the test data, and calculate the average value L i2 ; S5. Obtain the air film sound insulation value TL under the typical working condition Ci (i)(n＝1) =L i1 -L i2 ; S6. The calculation equation for the air film sound insulation under m typical working conditions is: S7. Count the total construction time T0 during which noise emission exceeds the standard. According to the difference in typical noise emission conditions, the total construction time T0 is divided into several time periods Ti (i=1, 2, 3, ...). Each time period may contain only one typical noise emission condition or a superposition of multiple typical conditions. According to steps S5 and S6, the sound insulation of the air film in each time period Ti is calculated, and then weighted according to the time proportion to obtain the sound insulation TN of the air film in T0; S8. The volume isolation TN obtained after calculation can be evaluated and classified as follows, in dB(A): When TN<10, the sound insulation performance is poor and should not be selected; When 10≤TN≤20, the sound insulation performance is average and is determined according to the sound insulation requirements; When TN>20, the sound insulation performance is excellent and it is recommended to give priority to it.

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