A survey method for site foundation pit dewatering staggered to sewage system

Abstract

The application discloses a kind of investigation methods of construction site foundation pit dewatering staggered to sewage system, using sensor and real-time data monitoring system, realize accurate capture and analysis drainage system water quality, flow, liquid level long sequence variation, improve the accuracy of investigation result;Through sensing technology and data analysis, the source of foundation pit dewatering staggered is quickly positioned, is favorable for timely taking measures to correct, improve investigation efficiency;At the same time, manual intervention and related equipment use are reduced.

Description

Technical Field

[0001] This invention belongs to the field of water environment management technology, and specifically relates to a method for investigating the misdirection of construction site foundation pit dewatering into the sewage system. Background Technology

[0002] In modern construction engineering, foundation pit dewatering is a crucial and common operation, primarily aimed at lowering the groundwater level to ensure the safety of the construction process. However, if not given sufficient attention, the dewatering treatment methods and discharge routes can lead to numerous environmental problems. In particular, when foundation pit dewatering, which is essentially clean water, is mistakenly discharged into the sewage treatment system, its large volume, low concentration, and long discharge duration can cause a series of issues, including overflow pollution, overloading of drainage systems, and reduced efficiency of sewage treatment plants. Therefore, how to safely and effectively investigate whether foundation pit dewatering is being discharged correctly has become a key focus and challenge in water environment management.

[0003] Currently, there are generally two methods for investigating the problem of dewatering in construction site foundation pits:

[0004] (1) The investigators went directly to all construction sites within the area to investigate, find the specific drainage points of the construction sites, and determine whether the drainage of the foundation pit of the construction site was correct.

[0005] (2) The investigation method is the same as that for other clean water mixed into the sewage system: for areas with problems, the source is traced from the end to the upstream. The investigation is carried out by manual inspection and simple water quality testing until the source of the problem is found.

[0006] However, the above methods have obvious limitations: ① Construction sites are closed management areas, and without authorization, external personnel cannot enter the construction site to conduct investigations, which will increase the workload and time required for coordination; ② The drainage points of the foundation pit at the construction site may change according to the construction progress, making it difficult for manual investigations to achieve 24-hour uninterrupted monitoring or monitoring of the entire construction process; ③ The investigation scope from the end to the upstream is large, lacks specificity, and is easily affected by other influencing factors; ④ Manual inspections require a lot of manpower and time, and are prone to blind spots and omissions; ⑤ Since manual water quality testing methods detect instantaneous water quality, the test results are easily affected by other factors such as groundwater infiltration, leading to incorrect judgments; ⑦ Once mis-drainage of foundation pit dewatering occurs, the reaction and handling time is long, making it difficult to take effective measures in the first instance.

[0007] Considering the problems with traditional investigation methods, solving the environmental pollution risks caused by mis-discharge of foundation pit dewatering requires the adoption of more advanced and effective technical means to improve the monitoring and investigation level of foundation pit dewatering discharge. Summary of the Invention

[0008] This invention aims to provide a method for investigating the misdischarge of dewatering from construction site foundation pits into the sewage system. By comprehensively applying multiple technical means, it can identify the problem of misdischarge of dewatering from foundation pits in a comprehensive, accurate, and rapid manner, improve investigation efficiency, and ensure the normal operation of the drainage system and environmental protection.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is: a method for investigating the misdirection of construction site foundation pit dewatering into a sewage system, the method comprising the following steps:

[0010] Step 1: Based on the drainage network data and drainage permit data, obtain the basic data of the drainage network and draw a sewage network system diagram; combined with the drainage permit data, determine the specific location, sewage discharge direction and discharge volume of each construction site on the sewage network system diagram; the basic data includes the pipe diameter, elevation, pipe material, flow direction and upstream and downstream connection relationship of the drainage network.

[0011] Step 2: Based on the drainage network data, divide the sewage network system diagram into sewage zones and record the key nodes at the boundary of the sewage zones where the construction site is located as monitoring stations; the key nodes are the starting and ending manholes of the sewage pipeline in each sewage zone, wherein the ending manhole of the upstream sewage zone is also the starting manhole of its downstream sewage zone.

[0012] Step 3: Install online monitoring equipment at the monitoring station; the online monitoring equipment monitors changes in water quality data, flow data, and liquid level data in real time through sensors, and reports the monitoring data to the application system of the online monitoring equipment for querying historical monitoring data; when the reported monitoring data exceeds the warning threshold of the online monitoring equipment, the monitoring station automatically issues a warning, and the monitoring station that automatically issues a warning is recorded as a warning station; the water quality data includes conductivity, COD (Chemical Oxygen Demand), and ammonia nitrogen;

[0013] Step 4: If the monitoring data curve of the warning station matches the characteristics of construction site foundation pit dewatering being misdischarged into the sewage system, then query the historical monitoring data of each monitoring station and continue to Step 5); if it does not match, then it is determined that the construction site foundation pit dewatering is not misdischarged into the sewage system.

[0014] Step 5: Compare the historical monitoring data of each monitoring station to determine the sewage zone between the warning station and the nearest non-warning station upstream of the warning station as the problem area; search for construction sites in the problem area, and use water quality rapid test strips or portable conductivity meters to conduct on-site water quality testing on the sewage pipe network around the construction site until a construction site is found where foundation pit dewatering is misdischarging into the sewage system;

[0015] Step 6: Inspect the drainage network to determine the discharge destination of dewatering from the foundation pit at construction sites where dewatering is misdirected to the sewage system.

[0016] According to embodiments of the present invention, the present invention can be further optimized, and the optimized technical solution is as follows:

[0017] In one preferred embodiment, step 2, wastewater zoning, specifically includes: dividing the wastewater into at least two levels—main wastewater zoning and branch wastewater zoning—based on the connection relationships between the main wastewater pipe, branch wastewater pipes, and secondary wastewater pipes, thus clearly defining the upstream and downstream relationships between each wastewater zoning. For example... Figure 4 As shown, the upstream and downstream areas can be distinguished according to the direction of sewage flow (red dotted arrows). The end of the arrow is downstream, and the beginning of the arrow is upstream.

[0018] In one preferred embodiment, the feature of step 4, where the dewatering from the construction site foundation pit is staggered and discharged into the sewage system, includes:

[0019] When dewatering from the construction site's foundation pit is misdirected into the sewage system, compared with the normal monitoring curve, the monitoring data curve of the warning station shows the characteristics of declining water quality data, increasing flow rate data, and increasing liquid level data. Moreover, the daily monitoring data curve of the warning station shows a similar trend, with a smaller decrease in water quality indicators during peak water usage periods during the day and a larger decrease in water quality indicators during off-peak water usage periods at night.

[0020] In one preferred embodiment, after determining in step 4 that the dewatering from the non-construction site foundation pit is misdischarged into the sewage system, the following steps are also included: taking the warning station as the starting station, and carrying out source tracing and investigation work on other reasons for the mixing of clean water into the sewage system at the nearest unwarranted station upstream.

[0021] In one preferred embodiment, in step 6, rapid visual inspection and closed-circuit television inspection are used to inspect the drainage network and identify the discharge destination of the foundation pit dewatering at construction sites where foundation pit dewatering is misdischarged into the sewage system.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The investigation method of this invention uses sensors and a real-time data monitoring system to accurately capture and analyze long-term changes in water quality, flow rate, and liquid level in the drainage system, thereby improving the accuracy of the investigation results. Through sensing technology and data analysis, the source of mis-drainage of foundation pit dewatering can be quickly located, which is conducive to taking timely corrective measures and improving investigation efficiency. At the same time, it helps to take timely measures to prevent pollution from spreading, which is of great significance to the protection of the ecological environment.

[0024] 2. Traditional methods for investigating foundation pit dewatering typically involve complex and extensive manual operations. The investigation method provided by this invention reduces manual intervention and the use of related equipment through automation and intelligent technologies.

[0025] 3. By collecting monitoring data, the survey method of the present invention can also be used to meet other data needs for the operation and management of drainage pipelines, such as assisting in the analysis of the degree of siltation in drainage pipelines and the analysis of the degree of pipeline damage rate. Attached Figure Description

[0026] Figure 1 This is a flowchart of an embodiment of the present invention for investigating the misdirection of construction site foundation pit dewatering to the sewage system;

[0027] Figure 2 This is a typical monitoring data curve of a construction site foundation pit dewatering and wastewater discharge system according to an embodiment of the present invention;

[0028] Figure 3 This is a monitoring data curve of a normally operating wastewater system according to an embodiment of the present invention;

[0029] Figure 4 This is a diagram showing the wastewater system zoning, monitoring station layout, and construction site location according to another embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of water quality monitoring data curves according to another embodiment of the present invention; wherein, the white dashed box in Figure 5(a) is the abnormal water quality monitoring data curve; the white dashed box in Figure 5(b) is the normal water quality monitoring data curve after investigation and resolution;

[0031] Figure 6 This is a before-and-after comparison diagram of another embodiment of the present invention. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Example 1

[0034] like Figure 1As shown, Embodiment 1 of the present invention provides a method for investigating the misdirection of construction site foundation pit dewatering into a sewage system. The steps of the investigation method are as follows:

[0035] S1: Review drainage network and drainage permit information

[0036] By systematically reviewing drainage pipe network and drainage permit data, we can grasp the main characteristics and attributes of the drainage pipe network, such as pipe diameter, elevation, pipe material, flow direction, and connection relationship. We can analyze and draw a sewage pipe network system diagram, and combine it with drainage permit data to clarify the specific location of each construction site, sewage discharge direction, and discharge volume on the system diagram, providing basic data support for subsequent investigation and management.

[0037] S2: Divide wastewater into zones

[0038] Based on drainage network data, the connection relationships of main sewage pipes, branch sewage pipes, and secondary sewage pipes are obtained. The survey area is divided into at least two levels of sewage zones: main sewage zone and branch sewage zone, so that the upstream and downstream relationships between each sewage zone are clear. For example... Figure 4 As shown, the upstream and downstream areas can be distinguished according to the direction of sewage flow (red dotted arrows). The end of the arrow is downstream, and the beginning of the arrow is upstream.

[0039] The key nodes at the boundary of the sewage zones where the construction site is located are recorded as monitoring stations; the key nodes are the starting and ending manholes of the sewage pipelines in each sewage zone, wherein the ending manhole of the upstream sewage zone is also the starting manhole of its downstream sewage zone.

[0040] S3: Install online monitoring equipment

[0041] Online monitoring equipment is installed at the monitoring stations. This equipment uses sensors to monitor changes in water quality, flow rate, and liquid level data in real time, and uploads the data to a software application system for historical data retrieval. When the reported monitoring data exceeds the warning threshold of the online monitoring equipment, the monitoring station automatically issues a warning, and the station that issues the automatic warning is recorded as a warning station. The water quality data includes conductivity, COD (Chemical Oxygen Demand), and ammonia nitrogen.

[0042] S4: Analysis of Early Warning Data Curves from Online Monitoring Equipment

[0043] like Figure 2 and Figure 3 As shown, when dewatering from a construction site's foundation pit is misdirected into the sewage system, the monitoring data curves, compared to those of a normally operating sewage system, exhibit characteristics such as decreased water quality, increased flow rate, and increased liquid level. Furthermore, as... Figure 2As shown, the daily monitoring data curves of the construction site's foundation pit dewatering and the sewage system show similar trends, with a smaller decrease in water quality indicators during peak daytime water use and a larger decrease during off-peak nighttime water use.

[0044] When the monitoring data curves of the early warning monitoring stations meet the above characteristics, it is necessary to immediately query the historical monitoring data of each monitoring station and proceed to the next step.

[0045] If the above characteristics are not met, the investigation will proceed from the early warning monitoring station to the nearest upstream non-early warning monitoring station to investigate other causes of clean water mixing into the sewage system.

[0046] S5: Water quality monitoring of pipelines surrounding construction sites within the warning area

[0047] By comparing the monitoring data from various monitoring stations, it can be determined that the problem area is located in the wastewater zone between the early warning monitoring station and the nearest non-early warning station upstream. Construction sites within this area are searched, and on-site water quality testing of the surrounding wastewater pipe network is conducted using rapid water quality test strips or portable conductivity meters until a construction site is identified as having a problem with mis-drainage of foundation pit dewatering.

[0048] S6: QV and CCTV inspection of drainage pipe network

[0049] By using QV (Quick Visual Inspection) and CCTV (Closed-Circuit Television Inspection) technologies, visual inspections can be conducted at the drainage points registered in the drainage permit at the construction site and the drainage pipes around the construction site. This will help determine the destination of the dewatering from the foundation pit at the construction site and provide a basis for subsequent remediation work.

[0050] The investigation method provided in this embodiment relates to the field of wastewater quality improvement and efficiency enhancement, aiming to improve the investigation efficiency of dewatering discharge in construction site foundation pits, ensure the normal operation of drainage systems, and significantly reduce the environmental risks caused by misdischarge of foundation pit dewatering.

[0051] Example 2

[0052] A municipal wastewater treatment plant has a designed capacity of 30,000 m³ / d, but its actual influent capacity reaches 36,000 m³ / d. The influent water concentration is only 30-40 mg / L. Because the influent volume and quality data of this wastewater treatment plant have been abnormal for a long time, it is suspected that there may be problems such as mis-discharge of dewatering water from construction site pits or other clean water intrusion into the wastewater system. An investigation was conducted according to the method provided in Example 1 of this invention, and the specific process is as follows:

[0053] S1: Review drainage network and drainage permit information

[0054] Based on existing drainage network data, a regional sewage system map was compiled, and combined with drainage permit data, it was confirmed that there are a total of 9 construction sites under construction in the area. Figure 4 As shown.

[0055] S2: Divide wastewater into zones

[0056] Based on drainage network data, the sewage system is divided into sewage zones. In this embodiment, according to the location of the construction site, the sewage system is divided into three levels: main sewage pipes, branch sewage pipes, and secondary sewage pipes. Figure 4 As shown.

[0057] S3: Install online monitoring equipment

[0058] like Figure 4 As shown, based on drainage network data, a total of 7 online monitoring devices are installed at the intersections of main and branch pipes in the sewage pipeline within the sewage treatment plant's catchment area. These devices monitor the water quality, liquid level, and flow rate of the sewage pipeline 24 hours a day and report the monitoring data to the application system of the online monitoring devices for historical monitoring data retrieval. When the reported monitoring data exceeds the warning threshold of the online monitoring devices, the monitoring stations automatically issue warnings, and the monitoring stations that issue automatic warnings are recorded as warning stations.

[0059] S4: Analysis of Early Warning Data Curves from Online Monitoring Equipment

[0060] When dewatering from the construction site's foundation pit is misdirected into the sewage system, compared with the normal monitoring curve, the monitoring data curve of the warning station shows the characteristics of declining water quality data, increasing flow rate data, and increasing liquid level data. Moreover, the daily monitoring data curve of the warning station shows a similar trend, with a smaller decrease in water quality indicators during peak water usage periods during the day and a larger decrease in water quality indicators during off-peak water usage periods at night.

[0061] If the monitoring data curve of the warning station matches the characteristics of construction site foundation pit dewatering being misdischarged into the sewage system, then the historical monitoring data of each monitoring station is queried, and the process proceeds to S5. If it does not match, then it is determined that the construction site foundation pit dewatering is not misdischarged into the sewage system, and starting from the warning station, the investigation is carried out upstream to the nearest non-warning station to trace and investigate other causes of clean water mixing into the sewage system.

[0062] S5: Water quality monitoring of pipelines surrounding construction sites within the warning area

[0063] On December 1, 2023, the water quality monitoring station on the west side of Bailong South Road issued an alert for abnormal fluctuations in water quality, with a significant decrease in ammonia nitrogen levels in the sewage network. After comparing water quality data from upstream and downstream monitoring stations, the water quality data from the Haifu First Heng Road monitoring station was found to be normal, and the problem area was determined to be the construction site located between Zhenxing South Road and Bailong South First Heng Road.

[0064] S6: QV and CCTV inspection of drainage pipe network

[0065] On December 3, the construction site completed rectification, the abnormal fluctuations in water quality monitoring data were eliminated, and the rectification process and results were recorded and reflected through online monitoring data, as shown in Figures 5(a) and 5(b).

[0066] This second embodiment demonstrates the efficiency and accuracy of the investigation method provided in embodiment 1. Through technical means such as scheme design, online monitoring, data analysis, on-site investigation, and effect verification, it achieves rapid and accurate handling of the problem of accidental discharge of dewatering from construction site foundation pits, effectively ensuring the normal operation of the sewage system and preventing environmental pollution.

[0067] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present embodiments by those skilled in the art will fall within the scope defined by the appended claims.

Claims

1. A method for investigating the misdirection of construction site foundation pit dewatering into a sewage system, characterized in that, The survey method includes the following steps: Step 1: Draw a sewage pipe network system diagram based on the drainage pipe network data and drainage permit data; and determine the location, sewage discharge direction, and discharge volume of each construction site on the sewage pipe network system diagram based on the drainage permit data. Step 2: Based on the drainage network data, divide the sewage network system diagram into sewage zones and record the key nodes at the boundary of the sewage zones where the construction site is located as monitoring stations. Step 3: Install online monitoring equipment at the monitoring station; the online monitoring equipment monitors changes in water quality data, flow data, and liquid level data in real time through sensors, and reports the monitoring data to the application system of the online monitoring equipment for querying historical monitoring data; when the reported monitoring data exceeds the warning threshold of the online monitoring equipment, the monitoring station automatically issues a warning, and the monitoring station that automatically issues a warning is recorded as a warning station; Step 4: If the monitoring data curve of the warning station matches the characteristics of construction site foundation pit dewatering being misdischarged into the sewage system, then query the historical monitoring data of each monitoring station and continue to step 5); if it does not match, then determine that it is not construction site foundation pit dewatering being misdischarged into the sewage system. Step 5: Compare the historical monitoring data of each monitoring station to determine the sewage zone between the warning station and the nearest non-warning station upstream of the warning station as the problem area; search for construction sites in the problem area and conduct water quality testing on the sewage pipe network around the construction sites until a construction site is found where foundation pit dewatering is mis-discharged into the sewage system; Step 6: Inspect the drainage network to determine the discharge destination of dewatering from the foundation pit at construction sites where dewatering is misdirected to the sewage system.

2. The investigation method for misdirected drainage of construction site foundation pit dewatering into the sewage system according to claim 1, characterized in that, The wastewater zoning in step 2 specifically includes: Based on the connection relationship between the main sewage pipe, the branch sewage pipe, and the branch sewage pipe, sewage zones are divided into at least two levels: the main sewage pipe zone and the branch sewage pipe zone.

3. The investigation method for misdirected drainage of construction site foundation pit dewatering into the sewage system according to claim 1, characterized in that, The characteristics of staggered discharge of dewatering from the construction site foundation pit into the sewage system in step 4 include: When dewatering from the construction site's foundation pit is misdirected into the sewage system, compared with the normal monitoring curve, the monitoring data curve of the warning station shows the characteristics of declining water quality data, increasing flow rate data, and increasing liquid level data. Moreover, the daily monitoring data curve of the warning station shows a similar trend, with a smaller decrease in water quality indicators during peak water usage periods during the day and a larger decrease in water quality indicators during off-peak water usage periods at night.

4. The investigation method for misdirected drainage of construction site foundation pit dewatering into the sewage system according to claim 1, characterized in that, After determining in step 4 that the dewatering from the foundation pit of a non-construction site was misdischarged into the sewage system, the following steps are also included: taking the warning station as the starting station, conduct source tracing and investigation work on other reasons for the mixing of clean water into the sewage system at the nearest unwarranted station upstream.

5. The investigation method for misdirected drainage of construction site foundation pit dewatering into the sewage system according to claim 1, characterized in that, In step 6, rapid visual inspection and closed-circuit television are used to inspect the drainage network and identify the discharge destination of the foundation pit dewatering at construction sites where foundation pit dewatering is misdischarged into the sewage system.

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