Underground engineering foundation pit drainage system

Abstract

The invention relates to the technical field of construction engineering, in particular to an underground engineering foundation pit drainage system which comprises a water level monitoring subsystem, a water blocking subsystem and a drainage subsystem. The water level monitoring subsystem comprises a surface water level correlation monitoring module, a bearing point water level monitoring module and a phreatic water level monitoring module; a basis is provided for construction adjustment by monitoring the surface water level, the phreatic water level and the underground water level; the water blocking subsystem comprises a waterproof curtain, and water can be prevented from leaking into the foundation pit by performing isolation and water prevention on parts such as a side slope and a pit bottom through the waterproof curtain; the drainage subsystem comprises a dewatering well arranged in the foundation pit and a drainage ditch arranged outside the foundation pit, the dewatering well is connected with the drainage ditch through a pump, a water level sensor is arranged in the dewatering well, and through the dewatering well, the pump and the drainage ditch, the water level of the bottom of the foundation pit can be controlled through the dewatering well, the water pressure is guaranteed, and water burst and slurry overflow are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a foundation pit drainage system for an underground engineering project. Background Art

[0002] Underground engineering is an important part of infrastructure such as rail transit and construction. Underground engineering needs to be surveyed before construction, including engineering geology and hydrogeology. After the survey is completed, the underground engineering construction plan is designed. Among them, hydrology is a matter that is greatly affected by related factors. It is necessary to survey groundwater and surface water. In order to standardize construction, this field has formulated strict testing and construction specifications to ensure the quality of the project and safety during the construction process.

[0003] Since hydrology is greatly affected by the environment and construction, multi-point treatment and monitoring are required. This application provides an underground engineering foundation pit drainage system that meets construction specifications, ensures construction safety and engineering quality, and can adapt to complex hydrological environments. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an underground engineering foundation pit drainage system that meets construction specifications, ensures construction safety and engineering quality, and can adapt to complex hydrological environments.

[0005] The present invention is realized by the following technical scheme: an underground engineering foundation pit drainage system, including a water level monitoring subsystem, a water blocking subsystem, and a drainage subsystem. The water level monitoring subsystem includes a surface water level associated monitoring module, a bearing point water level monitoring module, and a diving water level monitoring module; The water-blocking subsystem includes a water-blocking curtain; The drainage subsystem includes a precipitation well arranged in the foundation pit and a drainage ditch arranged outside the foundation pit. The precipitation well and the drainage ditch are connected through a pump. A water level sensor is arranged in the precipitation well. The surface water level associated monitoring module includes a surface water level monitor and a groundwater level monitor near the surface water; The anchor point water level monitoring module includes a water level monitor 2 arranged at the anchor point; The submersible water level monitoring module includes a water level monitor 3 arranged below the foundation pit; A leakage monitoring device is arranged inside the water-stop curtain.

[0006] Furthermore, the water level monitor 1, the water level monitor 2 and the water level monitor 3 all include a borehole, a measuring tube is arranged in the borehole, the measuring tube includes a base tube, a water hole is arranged on the side wall of the base tube, a filter layer is arranged outside the base tube, the filter layer includes a filter screen, a water seepage filling layer is arranged between the filter screen and the borehole, a sedimentation section is arranged at the lower end of the base tube, and a sealing filling layer is arranged between the upper end of the base tube and the borehole.

[0007] Furthermore, the surface water level associated monitoring module also includes a surface water status monitoring device, and the surface water status monitoring device includes an image acquisition device for monitoring the surface status of surface water.

[0008] Furthermore, a sand content detection device is connected to the water outlet or water inlet of the pump.

[0009] Furthermore, it also includes an inspection module, which records basic information of monitoring points and inspection information.

[0010] The beneficial effects of the present invention are as follows: the underground engineering foundation pit drainage system includes a water level monitoring subsystem, a water blocking subsystem, and a drainage subsystem. The water level monitoring subsystem includes a surface water level correlation monitoring module, a bearing point water level monitoring module, and a submerged water level monitoring module. By monitoring the surface water level, submerged water level, and groundwater level, a basis is provided for adjusting the construction; the water blocking subsystem includes a water-stop curtain, through which isolation and waterproofing are performed at the slope, the bottom of the pit, and other parts, which can prevent water from leaking into the foundation pit; the drainage subsystem includes a precipitation well arranged in the foundation pit and a drainage ditch arranged outside the foundation pit. The precipitation well and the drainage ditch are connected by a pump. A water level sensor is arranged in the precipitation well. Through the precipitation well, the pump, and the drainage ditch, the water level at the bottom of the foundation pit can be controlled through the precipitation well to ensure water pressure and avoid water gushing and slurry bubbling. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the control principle of Example 1; Figure 2 Schematic diagram of the measuring tube structure.

[0012] Among them: 1. base pipe; 2. filter screen; 3. bottom cover; 4. sedimentation section; 5. water seepage filling layer; 6. sealing filling layer; 7. upper cover. DETAILED DESCRIPTION

[0013] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0015] Example 1 like Figure 1-2 As shown, an underground engineering foundation pit drainage system includes a water level monitoring subsystem, a water blocking subsystem, and a drainage subsystem.

[0016] The water level monitoring subsystem includes a surface water level associated monitoring module, which includes a surface water level monitor and a groundwater level monitor near the surface water. During the construction of the underground engineering foundation pit, the surface water near the construction area will affect the groundwater and groundwater in the construction area. During the survey, the surface water level, groundwater level, groundwater level and soil quality information are recorded. After multiple measurements, the surface water level, groundwater level and groundwater level curves are obtained. The surface water level monitor includes a water level sensor 1 for monitoring the surface water level, thereby monitoring the surface water level. The groundwater level monitor includes a water level sensor 2. The surface water level associated monitoring module also includes a surface water status monitoring device. The surface water status monitoring device includes an image acquisition device for monitoring the surface water status. The image acquisition device uses camera one to monitor the surface water surface changes. Camera one is connected to the host computer and transmits image information to the host computer in real time. When vortices and bubbles appear on the water surface, the technicians judge the risk situation based on the image information and on-site investigation to ensure construction safety and project quality. Camera two is also installed on the embankment slope near the construction area to collect image information of the embankment slope and monitor the width, depth, number and development trend of cracks on the embankment slope.

[0017] The water level monitoring subsystem also includes a bearing point water level monitoring module. The bearing point water level monitoring module includes a water level monitor 2 installed at the bearing point. The water level monitor 2 includes a water level sensor 3. The bearing point refers to the overlap of the retaining pile construction, the corner, the adjacent building (structure), the relatively dense underground pipeline, the pile and other places where the ground stress is concentrated. Since the bearing point concentrates the stress on the soil layer and supports the structure, a water level sensor is installed at the bearing point to monitor the seepage status of the area to ensure construction safety and project quality. When the water level sensor 3 detects that the water level at the bearing point exceeds the preset value, the technician will conduct an inspection. During the construction process, the technician will regularly collect water samples at the bearing point. , detect the sand content, and then judge the foundation settlement state at the bearing point. For ease of use, a water pump is installed in the precipitation well near the bearing point, and then the precipitation well is dewatered. Water can also be pumped to detect the sand content. In the process of detecting the sand content, it is detected by an external detection device. The detection device includes a bent pipe, which is bent downward. A sewage pipe is installed at the bottom of the bent pipe. A valve is installed on the sewage pipe. The outlet end of the sewage pipe is detachably connected to a collection tank. The collection tank can be a glass jar or a balloon. In the process of pumping water, when the discharged water passes through the bent pipe, some sand gathers at the bent pipe and further enters the collection tank. Regularly checking the collection tank can determine the leakage of the precipitation well near the bearing point.

[0018] The water level monitoring subsystem also includes a submersible water level monitoring module, which includes a water level monitor 3 installed below the foundation pit. The water level monitor 3 includes a water level sensor 4. There are multiple water level sensors 4, and the distance between two adjacent water level sensors 4 is 20-50m, thereby monitoring the submersible water level.

[0019] In this embodiment, the water level monitor 1, the water level monitor 2, and the water level monitor 3 all include a borehole. After investigation, the borehole position and size are designed, and the borehole is constructed by geological drilling. A measuring pipe is placed in the borehole, and the measuring pipe includes a base pipe 1. The base pipe is a PVC pipe. The side wall of the base pipe is evenly processed with water holes. A filter layer is installed outside the base pipe. The filter layer includes a filter screen 2 wrapped outside the base pipe. The filter screen is made of a multi-layer dustproof net, which is convenient to manufacture. A water seepage filling layer 5 is backfilled between the filter screen and the borehole. The water seepage filling layer is composed of medium-coarse sand, which is backfilled after drying, has high fluidity, and is compacted after filling. There is a sealed filling layer between the upper end of the base pipe and the borehole. Layer 6, the dense filling layer is obtained by backfilling and compacting the original soil, which is the same as the surface soil layer. In order to prevent mud from entering the base pipe, no water holes are processed at the base pipe corresponding to the dense filling layer. A bottom cover 3 is installed at the lower end of the base pipe to prevent water from pouring into the base pipe from the lower end. An upper cover 7 is installed at the upper end of the base pipe to prevent debris from falling into the base pipe. Water in the soil layer enters the base pipe from the filter layer. The water level is monitored by a water level sensor installed in the base pipe, and then the water seepage state at this position is monitored. A small amount of sediment in the seepage water settles downward to form a sedimentation section 4 at the lower end of the base pipe. The groundwater and diving water levels are monitored by measuring pipes. The installation is convenient and the accuracy is high.

[0020] The water-blocking subsystem includes a water-stop curtain, which is fixed by mixing piles or piles and installed at the edge of the foundation pit, thereby preventing water and sand outside the water-stop curtain from entering the foundation pit. The water-stop curtain can be installed on the outside or inside of the slope support, which is convenient for installation. There is a leakage monitoring device on the inside of the water-stop curtain. The leakage monitoring device includes camera three to collect image information at the water-stop curtain. When the water-stop curtain cracks, leaks, etc., the technical staff will conduct on-site inspection.

[0021] The drainage subsystem includes a precipitation well constructed in the foundation pit and a drainage ditch constructed outside the foundation pit. The precipitation well and the drainage ditch are connected by a pump. A water level sensor five is installed in the precipitation well. The water outlet or water inlet of the pump is connected with a sand content detection device. The sand content detection device uses a CYS-Ⅲ sand content measuring instrument. The water level in the precipitation well is monitored by the water level sensor five. When the water level exceeds the preset value, the pump starts to drain. Precipitation is carried out before construction, and precipitation is carried out while construction is in progress.

[0022] The drainage subsystem also includes a water collection tank constructed in the foundation pit, which collects the accumulated water in the foundation pit and then discharges it. During the construction process, the drainage subsystem should be checked regularly to avoid blockage.

[0023] It also includes an inspection module, which records basic information of monitoring points and inspection information. The inspection module includes a handheld inspection instrument. The basic information of the monitoring points includes monitoring locations, monitoring items, and monitoring standard information. The inspection information includes inspection personnel, inspection time, and inspection result information. The technicians upload the inspection information to the host computer through the handheld inspection instrument. Due to the large amount of construction of underground engineering foundation pits, there are many locations that need to be inspected. In this application, the water level monitoring subsystem, the water blocking subsystem, and the drainage subsystem all need to be inspected to ensure construction safety and engineering quality. In this embodiment, some inspection contents are shown in Table 1. Table 1

[0024] Record the inspection contents in Appendix 1 into the handheld inspection instrument, and then conduct the inspection. The inspection contents include the drainage system and the support system, which should be selected according to the construction requirements.

[0025] The data of each water level sensor is uploaded to the controller, which is an industrial controller. The threshold of each water level sensor is set in the industrial controller. When the threshold is exceeded, an alarm is triggered. The technicians process the alarm information. Each camera and controller are connected to the host computer, which is a PC and is arranged in the control room. The host computer is connected to the server, which is a cloud server, for data storage and processing.

[0026] In summary, the underground engineering foundation pit drainage system provided in this embodiment includes a water level monitoring subsystem, a water blocking subsystem, and a drainage subsystem. The water level monitoring subsystem includes a surface water level correlation monitoring module, a bearing point water level monitoring module, and a submersible water level monitoring module. By monitoring the surface water level, submersible water level, and groundwater level, a basis is provided for adjusting the construction; the water blocking subsystem includes a water-stop curtain, through which isolation and waterproofing are performed at the slope, the bottom of the pit, and other parts, which can prevent water from leaking into the foundation pit; the drainage subsystem includes a precipitation well arranged in the foundation pit and a drainage ditch arranged outside the foundation pit. The precipitation well and the drainage ditch are connected by a pump. A water level sensor is arranged in the precipitation well. Through the precipitation well, the pump, and the drainage ditch, the water level at the bottom of the foundation pit can be controlled through the precipitation well to ensure water pressure and avoid water gushing and slurry. The inspection module can be used to inspect each node to ensure construction safety and project quality. It can be applicable to a large number of underground engineering constructions and has great social value.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground engineering foundation pit drainage system, characterized in that: Including water level monitoring subsystem, water blocking subsystem, drainage subsystem, The water level monitoring subsystem includes a surface water level associated monitoring module, a bearing point water level monitoring module, and a diving water level monitoring module; The water-blocking subsystem includes a water-blocking curtain; The drainage subsystem includes a precipitation well arranged in the foundation pit and a drainage ditch arranged outside the foundation pit. The precipitation well and the drainage ditch are connected through a pump. A water level sensor is arranged in the precipitation well. The surface water level associated monitoring module includes a surface water level monitor and a groundwater level monitor near the surface water; The anchor point water level monitoring module includes a water level monitor 2 arranged at the anchor point; The submersible water level monitoring module includes a water level monitor 3 arranged below the foundation pit; A leakage monitoring device is arranged inside the water-stop curtain.

2. The underground engineering foundation pit drainage system according to claim 1, characterized in that: The water level monitor 1, water level monitor 2 and water level monitor 3 all include a borehole, a measuring tube is arranged in the borehole, the measuring tube includes a base tube, a water hole is arranged on the side wall of the base tube, a filter layer is arranged outside the base tube, the filter layer includes a filter screen, a water seepage filling layer is arranged between the filter screen and the borehole, a sedimentation section is arranged at the lower end of the base tube, and a sealing filling layer is arranged between the upper end of the base tube and the borehole.

3. The underground engineering foundation pit drainage system according to claim 1, characterized in that: The surface water level associated monitoring module also includes a surface water status monitoring device, and the surface water status monitoring device includes an image acquisition device for monitoring the surface status of surface water.

4. The underground engineering foundation pit drainage system according to claim 1, characterized in that: The water outlet or water inlet of the pump is connected with a sand content detection device.

5. The underground engineering foundation pit drainage system according to claim 1, characterized in that: It also includes an inspection module, which records basic information of monitoring points and inspection information.

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