A method for using an electronic level to guide the excavation of vibration isolation trenches

Abstract

This invention discloses a method for guiding the excavation of vibration isolation trenches using an electronic level, belonging to the field of construction environmental monitoring technology. The method includes the following steps: 1. Simultaneously reading data from an electronic level and a vibration meter during the excavation of the vibration isolation trench and then exchanging the data equivalently; 2. After obtaining the data, using one or more electronic levels to replace the vibration meter at multiple locations to guide the excavation of the vibration isolation trenches; 3. After all the vibration isolation trenches in the site are completed, using the vibration meter to sequentially close and test the vibration isolation effect. Compared with traditional vibration meter detection methods, this invention enables green monitoring, expands the instrument's functionality, and utilizes portable and economical electronic levels or communication devices with this function to replace vibration meters, providing low-energy, convenient, and rapid guidance for large-area excavation of vibration isolation trenches.

Description

Technical Field

[0001] This invention belongs to the field of building construction environmental monitoring technology, and relates to a method for using an electronic level to guide the excavation of vibration isolation trenches. Background Technology

[0002] In construction engineering, the vibrations generated by dynamic compaction have harmful effects on the surrounding environment. Strong ground vibrations disrupt the normal work and lives of nearby residents, and in severe cases, can endanger the stability and safety of surrounding buildings, structures, and underground pipelines. Therefore, excavating vibration isolation trenches can effectively reduce the impact of dynamic compaction vibrations. However, the relevant parameters for excavating vibration isolation trenches are not easy to obtain. Excavation is usually conservative, based on the influence depth of the dynamic compaction energy level and construction experience. This often leads to over-excavation in areas with varying vibration intensities. When the excavation depth of the vibration isolation trench exceeds 6 meters, the construction difficulty or cost increases dramatically. To control over-excavation of the vibration isolation trench, vibration meters (dynamic signal testing and analysis systems are used as testing instruments) are commonly used during the excavation process to test the vibration intensity and determine the excavation parameters for the vibration isolation trench. However, vibration meter systems involve many components, have complex structures, and are costly to implement. They also require long operation times and have certain requirements regarding the surrounding environment, increasing project costs and seriously affecting the construction progress. Summary of the Invention

[0003] This invention overcomes the shortcomings of the prior art by proposing a method for using an electronic level to guide the excavation of vibration isolation trenches; thus solving the problems of complex excavation and inspection, high testing costs, and long time required in existing vibration isolation trench methods.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0005] A method for using an electronic level to guide the excavation of vibration isolation trenches includes the following steps:

[0006] S1 Data Correction:

[0007] 1.1: When excavating a vibration isolation trench for a building ≤15 meters from the vibration source, take a section first and install a vibration meter and several electronic levels on the vibration source side of the trench.

[0008] 1.2: When the dynamic compaction generates vibration during the foundation compaction, the peak value data displayed by the vibration meter and the X1 and Y1 values ​​displayed by the electronic level are read simultaneously;

[0009] 1.3: Convert the peak value data obtained by the vibration meter into the allowable vibration value, and carry out the preliminary excavation of the vibration isolation trench;

[0010] 1.4: After the initial excavation of the vibration isolation trench is completed, the vibration meter and electronic level are placed on the side of the vibration isolation trench to be isolated, and the data displayed on the vibration meter and electronic level are read at the same time.

[0011] 1.5: When the vibration measurement data of the vibration meter reaches the allowable vibration value, the excavation of the vibration isolation trench for that section is completed. At this time, the X2 and Y2 values ​​of the corresponding electronic level are read; the vibration meter and electronic level arranged in that section are removed.

[0012] S2 guides the excavation of other parts of the vibration isolation trench.

[0013] 2.1: Install an electronic level on the isolated side of the other parts of the vibration isolation trench;

[0014] 2.2: Excavate the remaining parts of the vibration isolation trench and monitor the data on the electronic level. When the data on the electronic level shows the X2 and Y2 values, the remaining parts of the vibration isolation trench are completed.

[0015] Preferably, the electronic level is fixed to a rigid object in the foundation and leveled before the electronic level is used for testing.

[0016] Preferably, when the vibration meter and the electronic level are measured simultaneously in step 1.2, the number of measurements is ≥3 times in the same plot, and the average data of the three groups is taken when exchanging data.

[0017] Preferably, after all the vibration isolation trenches are completed, a vibration meter is used to sequentially close and test the vibration isolation effect.

[0018] Preferably, when excavating vibration isolation trenches for buildings ≤15 meters from the vibration source, the data after correction by an electronic level is used as the measurement in daily inspections. During daily inspections, inspection points are set up on both sides of the vibration isolation trench and around the monitored building.

[0019] Preferably, the principle for setting up the vibration isolation trench is to be the closest range allowed to the source point. When excavating the vibration isolation trench, the measuring point of the electronic level is set at a position 2 to 3 meters away from the opening of the vibration isolation trench, and the distance between two adjacent measuring points is 20 meters. The measurement is taken at the top and bottom of the vibration isolation trench.

[0020] Preferably, in step 1.3, the peak value data obtained by the vibration meter is converted into the allowable vibration value according to the "Standard for Permissible Vibration of Building Engineering" GB 50868-2013.

[0021] Preferably, the electronic level is a mobile communication device carrying electronic level software.

[0022] More preferably, the mobile communication device is a mobile phone carrying electronic level software, and screen recording is used when reading the electronic level value.

[0023] The beneficial effects of this invention compared to the prior art are as follows:

[0024] 1. This invention achieves data exchange by using the monitoring data of a portable electronic level to replace the monitoring data of a conventional vibration meter, and the excavation of vibration isolation trenches can be directly guided by the data parameters of the electronic level.

[0025] 2. In addition to routine testing of foundation or component settlement and deformation, electronic levels can also be used to measure the tilt angle when deformation occurs due to foundation vibration. The angle can be used to guide the excavation of vibration isolation trenches. Compared with traditional vibration meter testing methods, this method can achieve green monitoring and expand the instrument's functionality. Replacing vibration meters with electronic levels allows for low-energy, convenient, and rapid guidance of large-area vibration isolation trench excavation.

[0026] 3. Existing electronic levels are often attached to mobile devices, such as mobile phones, which makes the inspection of vibration isolation trench excavation more convenient and faster. It can monitor the vibration of vibration-sensitive and fragile storage rooms in the site anytime and anywhere, and can assist vibration meters in monitoring and analyzing the damage caused by vibration to surrounding structures and buildings.

[0027] 4. At dynamic compaction construction sites, mobile phones can replace vibration meters to complete more than half of the vibration isolation trench excavation work and can also be used for the inspection of vibration isolation trenches. Compared with the inspection cost of traditional vibration meters, the inspection cost of using the electronic level in a mobile phone is almost negligible.

[0028] 5. Within the construction site, the vibration intensity varies depending on the medium in the foundation. By using the grid measurement method of the electronic level in the mobile phone, plots with different vibration intensities can be identified, which can guide the reasonable arrangement of vibration-sensitive and fragile objects in the project. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the acquisition of vibration intensity using a vibration meter and a mobile phone in an embodiment.

[0030] Figure 2 This is a schematic diagram illustrating the measurement process while digging the vibration isolation trench in the embodiment.

[0031] Figure 3 This is a schematic diagram of the closure detection after the vibration isolation trench is completed in the embodiment;

[0032] Figure 4 The image shows the display interface of the vibration meter when the vibration is generated by the foundation compaction and the values ​​of the vibration meter and the electronic level are read simultaneously in the embodiment.

[0033] Figure 5 This is a screenshot of the mobile phone's display interface when the vibration meter and electronic level are read simultaneously during the vibration generated by the foundation compaction in the embodiment.

[0034] Figure 6The image shows the display interface of the vibration meter when the vibration isolation trench is excavated to 8 meters and the values ​​of the vibration meter and the electronic level are read simultaneously.

[0035] Figure 7 The image shows the mobile phone's display interface when the vibration isolation trench is excavated to 8 meters and the values ​​of the vibration meter and electronic level are read simultaneously.

[0036] In the diagram: 1. Vibration meter; 2. Mobile phone; 3. Vibration isolation trench; 4. Seismic source point; 5. One side of the seismic source; 6. The side being isolated. Detailed Implementation

[0037] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0038] Combined with appendix Figure 1-7 This embodiment proposes a method for detecting vibration isolation trench excavation using an electronic level in a mobile phone. The case study project covers a total construction area of ​​approximately 86,000 square meters, employing dynamic compaction at energy levels of 8000KN, 6000KN, and 4000KN. The site has a maximum north-south elevation difference of 15.8 meters and an east-west elevation difference of 11.3 meters. Residential buildings are located to the south, while enterprise facilities and production plants are situated to the east and west. A parking lot and some warehouses are located to the north. According to the design and client requirements, vibration isolation trenches need to be excavated in all four directions of the site, and daily monitoring of the dynamic compaction vibration is required during construction. Based on the project requirements and actual site conditions, the specific construction steps for detecting the vibration isolation trench excavation are as follows:

[0039] 1. Conduct a site survey to identify buildings and structures subject to vibration control requirements, and preliminarily plan the location of vibration isolation trenches. The principle for setting up vibration isolation trenches is to be within the allowable range from the seismic source. Specifically, select the residential buildings on the south side as the key vibration isolation areas, measure the allowable range from the seismic source, and use this to preliminarily plan the location of the vibration isolation trenches and determine the parameter range for measurement with a mobile phone level.

[0040] 2. Level the site, bring in dynamic compaction equipment, set up a test compaction area, and arrange leveling points and compaction points on the site.

[0041] 3. Lay out the lines at point 3 of the vibration isolation trench for the residential buildings on the south side, and bring in the excavation equipment.

[0042] 4. Deformation observation points and vibration impact inspection points are set up at the three locations of the vibration isolation ditch on the south side and around the corresponding residential buildings.

[0043] 5. On the vibratory source side 5 of the foundation isolation trench, 3 meters away from the opening of the trench 3, install an industry-specific vibration meter 1 and several mobile phones 2 equipped with electronic level software. When installing the mobile phones, select several solid clay bricks, bury them on the ground surface, compact them, and then use double-sided tape to fix the mobile phones 2 in place. The vibration meter 1 uses a dynamic signal testing and analysis system (model DH-5921) and a matching 2D001 velocity sensor manufactured by Jiangsu Donghua Testing Technology Co., Ltd. The measured physical quantities are the ground particle vibration velocity v (mm / s) and acceleration a (m / s²). 2 The time-domain curve of the device can be obtained, and the dominant frequency at the measuring point can be obtained by frequency domain analysis of the time-domain curve. The second mobile phone uses a Huawei Mate40 and its accompanying electronic level software.

[0044] 6. Adjust and set the vibration meter 1, open the electronic level software on mobile phone 2, and gently tap the four corners of the clay brick to level the electronic level on mobile phone 2. Start measuring simultaneously under the vibration of the tamping.

[0045] 7. Construction will begin with dynamic compaction at the highest energy level of 8000KN, used in this project. During the vibration generated by the compaction, the readings from both the vibration meter 1 and the electronic level on mobile phone 2 will be simultaneously recorded. Screen recording will be used when reading the electronic level readings. (See also...) Figure 4 and Figure 5 On-site testing showed that the peak values ​​of vibration meter 1 were X=251.64 and Y=5.358. At this time, the maximum values ​​displayed by the electronic level on the mobile phone were X1: 2.3° and Y1: 0.7°. According to Table 8.0.2-2 of the "Standard for Allowable Vibration of Building Engineering" GB50868-2013, the vibration at this time far exceeded the allowable vibration value of the building, and measures such as digging vibration isolation trenches must be taken.

[0046]

[0047] 8. Based on engineering experience, the peak value displayed by the vibration meter indicates that the depth of the vibration isolation trench 3 needs to be at least 6 meters. It also needs to be excavated "through" along the dynamic compaction construction site. Based on the maximum length of the dynamic compaction equipment of 10 meters, the length of the vibration isolation trench is taken as a reference for the compaction vehicle, and it is expanded by 10 meters in front and behind. Therefore, the vibration isolation trench should be excavated first with a depth of 6 meters and a length of 30 meters.

[0048] 9. When the vibration isolation trench 3 is excavated to a depth of 6 meters, the vibration meter 1 and the mobile phone 2 are then placed on the vibration-isolated side 6 of the trench 3. The electronic level in the mobile phone 2 is adjusted. During the excavation of the vibration isolation trench, a method of excavation and measurement should be adopted simultaneously. According to Article 8.0.1 of the "Standard for Allowable Vibration of Building Engineering" (GB 50868-2013), the vibration velocity evaluation index of the building structure foundation should be the maximum value of the two peak values ​​and their corresponding vibration frequency. Based on the test results, when the dynamic compaction construction point is 246m away from the building structure foundation, refer to... Figure 6 The vibration velocity peak value at the foundation displayed on vibration meter 1 was 10.902 mm, corresponding to a frequency of 6.7 Hz. According to Table 8.0.2-2 of the "Standard for Allowable Vibration of Building Engineering" (GB 50868-2013), the peak vibration velocity of the building foundation caused by dynamic compaction is less than the allowable peak vibration velocity (12 mm / s).

[0049] When the measured data reaches the allowable vibration value, the excavation of vibration isolation trench 3 will cease. At this point, vibration isolation trench 3 will have been excavated to a depth of 8 meters. See [link / reference needed]. Figure 7 At this point, the electronic level in mobile phone 2 displays a maximum value of X2: 0.5°, Y2: 0.2°. Based on this test data, multiple mobile phones can be used to repeat the above steps, simultaneously excavating vibration isolation trenches on the east, west, and north sides of the site to reduce the vibration frequency to within the allowable vibration range. During the excavation of other vibration isolation trenches, vibration meter 1 is not required for testing; only the electronic level in mobile phone 2 is needed. When the maximum value displayed by the electronic level is X: 0.5°, Y: 0.2°, it indicates that the depth of vibration isolation trench 3 has reached the requirement, and excavation can be stopped, avoiding the problem of over-excavation of vibration isolation trenches caused by conventional experience judgment.

[0050] During the actual excavation on site, because there were industrial buildings to the north and the elevation was more than 4 meters lower than the average elevation of the dynamic compaction site, the section was excavated to 2.1 meters using the electronic level in the mobile phone 2 to meet the vibration requirements. Meanwhile, due to the difference in elevation and soil medium on the east and west sides, only about 6 meters of excavation was needed to meet the requirements. Compared with the usual 8-meter excavation, this saved costs and shortened the construction period.

[0051] 10. After all the vibration isolation trenches have been excavated, a vibration meter should be used to conduct a closed-loop inspection at the building foundation location designated by the owner.

[0052] 11. After the vibration isolation trench excavation is completed and large-area dynamic compaction construction begins, daily inspections can be carried out directly using the electronic level in mobile phone 2 at the monitoring points set up on site, and corresponding inspection records can be filled out. There is no need to use the vibration meter 1 for routine on-site inspections, greatly reducing the cost and operational difficulty of daily inspections.

[0053] Note: When excavating vibration isolation trenches for key buildings, residential buildings, or buildings within 15 meters of the vibration source, the electronic level in the mobile phone should not be used alone for measurement. However, the electronic level in the mobile phone can be used for measurement during routine inspections. During routine inspections, detection points should be set up on both sides of the vibration isolation trench and around the monitored building. The vibration measurement points can be foundation deformation monitoring points, so that the mobile phone can monitor both foundation deformation and vibration intensity.

[0054] The principle for setting up the vibration isolation trench 3 is to be the closest possible distance from the seismic source point 4. When excavating the vibration isolation trench 3, the measuring points of the mobile phone should be set at a position of 2 to 3 meters away from the opening of the vibration isolation trench 3. The distance between two adjacent measuring points should be 20 meters. During the measurement, measurements should be taken at the top and bottom of the vibration isolation trench 3. The construction method is to excavate and measure at the same time. Multiple mobile phones can be used to start work simultaneously on different plots during the measurement.

[0055] Within the construction site, the vibration intensity varies depending on the medium in the foundation. By using mobile phone grid measurement, different vibration intensity plots can be identified, which can guide the reasonable placement of vibration-sensitive and fragile objects in the project.

[0056] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A method for using an electronic level to guide the excavation of vibration isolation trenches, characterized in that, Includes the following steps: S1 Data Correction: 1.1: When excavating a vibration isolation trench (3) for a building ≤15 meters away from the vibration source, take a section first and install a vibration meter (1) and several electronic levels on the vibration source side (5) of the vibration isolation trench (3); 1.2: When the dynamic compaction generates vibration during the foundation compaction, the peak value data displayed by the vibration meter (1) and the data X1 value and Y1 value displayed by the electronic level are read simultaneously; 1.3: According to Article 8.0.1 of the "Standard for Permissible Vibration of Building Engineering" GB 50868-2013, the vibration velocity evaluation index of the building foundation is the maximum value of the vibration velocity peak obtained by the vibration meter (1) and its corresponding vibration frequency; then, by referring to Table 8.0.2-2 of the "Standard for Permissible Vibration of Building Engineering" GB 50868-2013, it is determined whether the peak vibration velocity of the building foundation caused by the impact of dynamic compaction is less than the permissible peak vibration velocity, so as to guide the initial excavation of the vibration isolation trench (3); 1.4: After the initial excavation of the vibration isolation trench is completed, the vibration meter (1) and the electronic level are placed on the vibration-isolated side (6) of the vibration isolation trench (3), and the data displayed on the vibration meter (1) and the electronic level are read at the same time. 1.5: When the measured data of the vibration meter (1) reaches the allowable vibration value, the excavation of the vibration isolation trench (3) of this section is completed. At this time, the data X2 value and Y2 value on the corresponding electronic level are read; the vibration meter (1) and electronic level arranged in this section are removed. S2 guides the excavation of other parts of the vibration isolation trench (3). 2.1: Install an electronic level on the isolated side (6) of the other parts of the vibration isolation trench (3); 2.2: Excavate the other parts of the vibration isolation trench (3) and monitor the data on the electronic level. When the data on the electronic level shows the X2 value and Y2 value, the other parts of the vibration isolation trench (3) are completed.

2. The method for using an electronic level to guide the excavation of a vibration isolation trench according to claim 1, characterized in that, Before using an electronic level, fix the electronic level on a rigid object in the foundation and level it.

3. The method for using an electronic level to guide the excavation of a vibration isolation trench according to claim 1, characterized in that, In step 1.2, when the vibration meter (1) and the electronic level are measured simultaneously, the number of measurements in the same plot is ≥3 times, and the average data of the three groups is taken when exchanging data.

4. The method for using an electronic level to guide the excavation of a vibration isolation trench according to claim 1, characterized in that, After all the vibration isolation trenches (3) are completed, the vibration isolation effect is detected by closing them one by one using a vibration meter (1).

5. A method for guiding the excavation of vibration isolation trenches using an electronic level as described in claim 1, characterized in that, When excavating vibration isolation trenches for buildings ≤15 meters from the vibration source, the data after correction by an electronic level is used as the measurement in daily inspections. During daily inspections, inspection points are set up on both sides of the vibration isolation trench and around the monitored building.

6. The method for using an electronic level to guide the excavation of a vibration isolation trench according to claim 1, characterized in that, The principle for setting up the vibration isolation trench (3) is to be the closest range allowed to the source point (4). When excavating the vibration isolation trench (3), the measuring point of the electronic level is set at a position 2 to 3 meters away from the opening of the vibration isolation trench (3). The distance between the electronic level of two adjacent measuring points is 20 meters. When conducting the measurement, measurements are taken at the top and bottom of the vibration isolation trench (3).

7. A method for using an electronic level to guide the excavation of a vibration isolation trench according to any one of claims 1-6, characterized in that, The electronic level is a mobile communication device carrying electronic level software.

8. A method for using an electronic level to guide the excavation of a vibration isolation trench according to claim 7, characterized in that, The mobile communication device is a mobile phone (2) carrying electronic level software. When reading the electronic level value, the mobile phone screen recording method is adopted.

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