CN112627213A - Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain - Google Patents

Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain Download PDF

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Publication number
CN112627213A
CN112627213A CN202011490424.2A CN202011490424A CN112627213A CN 112627213 A CN112627213 A CN 112627213A CN 202011490424 A CN202011490424 A CN 202011490424A CN 112627213 A CN112627213 A CN 112627213A
Authority
CN
China
Prior art keywords
seepage
pipe
foundation pit
water
diversion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011490424.2A
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Chinese (zh)
Inventor
岳建伟
刑旋旋
王永锋
赵丽敏
孔庆梅
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Henan University
Original Assignee
Henan University
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Filing date
Publication date
Application filed by Henan University filed Critical Henan University
Priority to CN202011490424.2A priority Critical patent/CN112627213A/en
Publication of CN112627213A publication Critical patent/CN112627213A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • E02D1/02Investigation of foundation soil in situ before construction work
    • E02D1/027Investigation of foundation soil in situ before construction work by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0006Plastics
    • E02D2300/0015HDPE
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2450/00Gaskets
    • E02D2450/10Membranes
    • E02D2450/105Membranes impermeable
    • E02D2450/106Membranes impermeable for liquids
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/10Miscellaneous comprising sensor means

Abstract

The invention belongs to the technical field of foundation pit construction, and particularly relates to a water seepage source diagnosis and flow guide device for a foundation pit without a waterproof curtain. The device comprises a flow guide mechanism and a detection mechanism, wherein the flow guide mechanism comprises a flow guide pipe, the pipe body of the flow guide pipe is divided into a negative pressure section and a seepage section from top to bottom, the pipe wall of the seepage section is provided with a plurality of seepage holes, and the pipe body of the seepage section of the flow guide pipe is filled with filter materials; the detection mechanism comprises a plurality of sensors embedded in the filter material, the sensors are arranged in the filter material from top to bottom, the output ends of the sensors are in signal connection with the input end of an external signal acquisition instrument through a lead, and the output end of the signal acquisition instrument is in wireless signal connection with the input end of a cloud platform server. The method can effectively detect the position of the water seepage source of the foundation pit without the waterproof curtain, and improves the safety performance of the foundation pit.

Description

Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain
Technical Field
The invention belongs to the technical field of foundation pit construction, and particularly relates to a water seepage source diagnosis and flow guide device for a foundation pit without a waterproof curtain.
Background
For foundation pits which are supported by slope release, soil nails, anchor cables and the like and do not have waterproof curtains, water seepage phenomena are often encountered, water sources can be sewage, water supply, river water and the like, the cohesive force and the friction angle of soil bodies are reduced rapidly, the foundation pits are laterally moved and subsided on the ground surface, and even the foundation pits collapse. In recent years, foundation pit collapse accidents are in certain connection with pit wall water seepage. When the deformation of the foundation pit exceeds a critical value, emergency treatment is usually carried out by adopting modes of foundation pit backfilling, grouting and the like, so that on one hand, the construction period is delayed, the engineering cost is increased, on the other hand, the periphery of the foundation pit is cracked, and potential safety hazards exist. However, in an objective way, as long as a water seepage source is not found, the mechanical property of a soil body is reduced, the additional load is increased, and the potential danger of a foundation pit caused by water seepage cannot be radically eliminated. Therefore, how to provide a method for diagnosing and guiding the water source of the water seepage point of the foundation pit without the waterproof curtain, which has the advantages of simple construction operation and low cost, and can meet the water stopping effect, is a technical problem which is urgently needed to be solved at present.
Disclosure of Invention
The invention aims to provide a water seepage source diagnosis and flow guide device for a foundation pit without a waterproof curtain, which can effectively detect the position of a water seepage source of the foundation pit without the waterproof curtain and improve the safety performance of the foundation pit.
The technical scheme adopted by the invention is as follows:
the device comprises a flow guide mechanism and a detection mechanism, wherein the flow guide mechanism comprises a flow guide pipe, the pipe body of the flow guide pipe is divided into a negative pressure section and a seepage section from top to bottom, the pipe wall of the seepage section is provided with a plurality of seepage holes, and the pipe body of the seepage section of the flow guide pipe is filled with filter materials; the detection mechanism comprises a plurality of sensors embedded in the filter material, the sensors are arranged in the filter material from top to bottom, the output ends of the sensors are in signal connection with the input end of an external signal acquisition instrument through a lead, and the output end of the signal acquisition instrument is in wireless signal connection with the input end of a cloud platform server.
Preferably, the filter material is ceramsite, the seepage holes comprise a plurality of rows of through holes distributed along the circumferential direction of the flow guide pipe, and each row of through holes are arranged in an axially extending manner along the flow guide pipe.
Preferably, the sensors are arranged in rows and extend axially along the draft tube, and the rows of sensors are circumferentially distributed in the draft tube.
Preferably, the top of the negative pressure section pipe body of the flow guide pipe is connected with a suction port of the vacuum pump.
Preferably, the device also comprises a circular anti-seepage film, and the anti-seepage film is laid on the ground within the range of taking the top end of the flow guide pipe as the center of a circle and taking the half length of the shaft of the flow guide pipe as the radius.
Preferably, the cloud platform server is in wireless signal connection with the mobile terminal.
Preferably, the vacuum pump, the sensor and the signal acquisition instrument are powered by a mobile power supply, and the mobile power supply is a storage battery or a solar battery.
Preferably, the vacuum pump is a water ring vacuum pump.
Preferably, the impermeable membrane is a HDPE geomembrane.
The working process of the invention is as follows:
when the water seepage phenomenon occurs in the foundation pit, a plurality of devices are buried on the ground at the periphery of the foundation pit, and then detection is carried out. The device close to the water seepage point can quickly introduce a water source from the water seepage hole, the water source penetrates through the ceramsite and contacts the sensor, and the sensor in the guide pipe is distributed in multiple directions, so that the sensor contacting with water firstly can judge the water seepage direction by utilizing the direction of the sensor, and the approximate direction of the water source of the water seepage point is judged.
Meanwhile, because the water contents of different areas around the water seepage point are different, the water seepage point has direct influence on the salinity in water and simultaneously influences the parameters such as the conductivity of water, and the like, and the water quality parameters of the water seepage points of different types are different definitely, such as the difference between sewage and a common water source is large. After determining initial water source parameters and subsequent water source parameters and transmitting the initial water source parameters and the subsequent water source parameters to a cloud platform server side for operation and comparison, the sensor can determine the water source type of the water seepage point, judge the position of the water source of the water seepage point and the forming reason by combining data records such as local hydrology, soil property and the like, and then transmit corresponding data to a mobile terminal such as a mobile phone and the like. The field constructor can purposefully carry out operations such as water source excavation of the water seepage points, foundation pit protection and the like.
Moisture that gets into in the honeycomb duct can be through opening the vacuum pump suction discharge, is the clearance needs of device itself on the one hand, and on the other hand accelerates the drainage operation to the infiltration point, especially small-size infiltration point, if can be through the quick drainage of honeycomb duct, then need not to carry out subsequent large-scale excavation drainage operation. Meanwhile, the anti-seepage film can prevent air from entering the soil body, and when the guide pipe sucks water for drainage, negative pressure can be formed nearby the guide pipe, so that the drainage efficiency of water stored in the soil body is further improved, and the energy consumption of the vacuum pump is reduced. The ceramsite is arranged, on one hand, because the ceramsite has a strong water absorption effect, water at a water seepage point can be accelerated to permeate into the flow guide pipe and be sensed by the sensor so as to improve the diagnosis efficiency, and on the other hand, the ceramsite has the characteristics of large volume and small density, is not easy to block a seepage hole, and is light in weight, so that the transportation operation of the whole device is facilitated. The device is convenient to operate and use, and the position and the type of the water seepage point are tested and judged through the influence of water on the soil, so that the device can meet the use premise as long as the water seepage point is not frozen in principle.
Compared with the prior art, the invention has the following advantages:
1) according to the invention, the water seepage direction and the water parameters are sensed by the sensors, and the directions and types of the water seepage points are timely compared and found, so that the effectiveness of subsequent construction treatment is improved, the blind excavation of an excavator in the prior art is avoided for searching the water seepage points and paths, the disturbance of construction machinery to the side wall of the foundation pit is reduced, and the possibility of foundation pit collapse is reduced;
2) the invention can control the water content in the side wall of the foundation pit in time, reduce the influence of water seepage on the soil body of the side wall of the foundation pit, even improve the mechanical property of the soil body of the side wall so as to ensure the safety performance of the foundation pit, and can quickly guide accumulated water out of the periphery of the foundation pit in summer and other heavy rains so as to prevent the water seepage phenomenon of the foundation pit.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the water seepage source diagnosis and diversion device for the foundation pit without the waterproof curtain comprises a diversion mechanism and a detection mechanism, wherein the diversion mechanism comprises a diversion pipe and a circular anti-seepage film 5, and the anti-seepage film 5 is laid on the ground within the range that the top end of the diversion pipe is the circle center and the half length of the diversion pipe shaft is the radius.
The tube body of the draft tube is divided into a negative pressure section 11 and a seepage section 12 from top to bottom, and a suction tube of the vacuum pump 2 penetrates through the anti-seepage film 5 and then is communicated with the top of the tube body of the negative pressure section 11; a plurality of seepage holes 13 are formed in the wall of the seepage section 12, ceramsite 14 is filled in the seepage section of the flow guide pipe, the seepage holes 13 comprise a plurality of rows of through holes distributed along the circumferential direction of the flow guide pipe, and each row of through holes are arranged along the axial extension of the flow guide pipe.
The detection mechanism comprises a plurality of sensors 3 embedded in the ceramsite 14, the sensors 3 are arranged in a row and extend axially along the flow guide pipe, and the plurality of rows of sensors 3 are circumferentially distributed in the flow guide pipe. The output end of the sensor 3 is in signal connection with the input end of an external signal acquisition instrument 31 through a wire, the output end of the signal acquisition instrument 31 is in wireless signal connection with the input end of a cloud platform server, and the cloud platform server is in wireless signal connection with the mobile terminal.
The vacuum pump 2 is a water ring vacuum pump, the impermeable membrane 5 is a high-density polyethylene (HDPE) geomembrane, the vacuum pump, the sensor and the signal acquisition instrument are powered by a mobile power supply, and the mobile power supply is a storage battery or a solar battery.
The working process of the invention is as follows:
when the water seepage phenomenon occurs in the foundation pit, a plurality of devices are buried in the ground 4 at the periphery of the foundation pit, and then detection is carried out. The device close to the water seepage point can quickly introduce a water source from the water seepage hole, the water source penetrates through the ceramsite and contacts the sensor, and the sensor in the guide pipe is distributed in multiple directions, so that the sensor contacting with water firstly can judge the water seepage direction by utilizing the direction of the sensor, and the approximate direction of the water source of the water seepage point is judged.
Meanwhile, because the water contents of different areas around the water seepage point 6 are different, the water seepage point has direct influence on the salinity in water and simultaneously influences the parameters such as the conductivity of water, and the like, and the water quality parameters of the water seepage points of different types are different definitely, such as the difference between sewage and a common water source is large. After determining initial water source parameters and subsequent water source parameters and transmitting the initial water source parameters and the subsequent water source parameters to a cloud platform server side for operation and comparison, the sensor can determine the water source type of the water seepage point, judge the position of the water source of the water seepage point and the forming reason by combining data records such as local hydrology, soil property and the like, and then transmit corresponding data to a mobile terminal such as a mobile phone and the like. The field constructor can purposefully carry out operations such as water source excavation of the water seepage points, foundation pit protection and the like.
Moisture that gets into in the honeycomb duct can be through opening the vacuum pump suction discharge, is the clearance needs of device itself on the one hand, and on the other hand accelerates the drainage operation to the infiltration point, especially small-size infiltration point, if can be through the quick drainage of honeycomb duct, then need not to carry out subsequent large-scale excavation drainage operation. Meanwhile, the anti-seepage film can prevent air from entering the soil body, and when the guide pipe sucks water for drainage, negative pressure can be formed nearby the guide pipe, so that the drainage efficiency of water stored in the soil body is further improved, and the energy consumption of the vacuum pump is reduced. The ceramsite is arranged, on one hand, because the ceramsite has a strong water absorption effect, water at a water seepage point can be accelerated to permeate into the flow guide pipe and be sensed by the sensor so as to improve the diagnosis efficiency, and on the other hand, the ceramsite has the characteristics of large volume and small density, is not easy to block a seepage hole, and is light in weight, so that the transportation operation of the whole device is facilitated. The device is convenient to operate and use, and the position and the type of the water seepage point can be tested and judged by the influence of water on the soil, so that the device can be used as long as the water seepage point is not frozen in principle.
Performance parameters of the sensor: the direct current power supply voltage is 10-30v, the salinity accuracy is +/-2% F.S, the conductivity accuracy is +/-3%, the moisture range is 0-100%, the conductivity range is 0-20000us/cm, and the response time is less than 1 s. Parameters of the signal acquisition instrument: DC10-30V direct current wide voltage supplies power, a data uploading interface RS485/RJ45 network port stores 52 ten thousand data, and the data uploading interval is 1-10000 s.

Claims (9)

1. The device for diagnosing and guiding the seepage source of the foundation pit without the waterproof curtain is characterized by comprising a guiding mechanism and a detecting mechanism, wherein the guiding mechanism comprises a guiding pipe, the pipe body of the guiding pipe is divided into a negative pressure section and a seepage section from top to bottom, a plurality of seepage holes are formed in the pipe wall of the seepage section, and a filter material is filled in the pipe body of the seepage section of the guiding pipe;
the detection mechanism comprises a plurality of sensors embedded in the filter material, the sensors are arranged in the filter material from top to bottom, the output ends of the sensors are in signal connection with the input end of an external signal acquisition instrument through a lead, and the output end of the signal acquisition instrument is in wireless signal connection with the input end of a cloud platform server.
2. The water seepage source diagnosis and diversion device for the foundation pit without the waterproof curtain as claimed in claim 1, wherein the filter material is ceramsite, the water seepage holes comprise a plurality of rows of through holes distributed along the circumferential direction of the diversion pipe, and each row of through holes is arranged to extend along the axial direction of the diversion pipe.
3. The apparatus for diagnosing a seepage source and guiding water in a foundation pit without a waterproof curtain as claimed in claim 1, wherein the sensors are arranged in a row and extend axially along the guide pipe, and a plurality of rows of sensors are circumferentially distributed in the guide pipe.
4. The water seepage source diagnosis and diversion device for the foundation pit without the waterproof curtain as claimed in claim 1, wherein the top of the negative pressure section pipe body of the diversion pipe is connected with a suction port of a vacuum pump.
5. The apparatus for diagnosing a seepage source and guiding water in a foundation pit without a waterproof curtain of claim 1, further comprising a circular impermeable membrane laid on the ground within a range of a radius of a half length of an axis of the draft tube from a top end of the draft tube.
6. The water seepage source diagnosis and diversion device for the foundation pit without the waterproof curtain as claimed in claim 1, wherein the cloud platform server is in wireless signal connection with a mobile terminal.
7. The water seepage source diagnosis and diversion device for the foundation pit without the waterproof curtain as claimed in claim 4, wherein the vacuum pump, the sensor and the signal acquisition instrument are powered by a mobile power supply, and the mobile power supply is a storage battery or a solar battery.
8. The seepage source diagnosis and diversion device for a foundation pit without a waterproof curtain as claimed in claim 4, wherein the vacuum pump is a water ring vacuum pump.
9. The seepage source diagnosis and diversion device for foundation pits without waterproof curtains of claim 5, wherein the seepage-proof membrane is a geomembrane made of HDPE material.
CN202011490424.2A 2020-12-17 2020-12-17 Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain Pending CN112627213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011490424.2A CN112627213A (en) 2020-12-17 2020-12-17 Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011490424.2A CN112627213A (en) 2020-12-17 2020-12-17 Water seepage source diagnosis and flow guide device for foundation pit without waterproof curtain

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Publication Number Publication Date
CN112627213A true CN112627213A (en) 2021-04-09

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08311852A (en) * 1995-05-17 1996-11-26 Shimizu Corp Pumping test method
CN203350002U (en) * 2013-07-11 2013-12-18 瓮福(集团)有限责任公司 Phosphogypsum slag stockyard dam body seepage-proof detection system
CN105201000A (en) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 Wide foundation pit precipitation method capable of remotely monitoring
CN106120701A (en) * 2016-08-23 2016-11-16 河海大学 Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic
CN109541183A (en) * 2018-12-29 2019-03-29 昆明理工大学 A kind of protector for sensor detecting open-pit mine blast deep ground moisture content
CN209523210U (en) * 2018-12-24 2019-10-22 上海长凯岩土工程有限公司 A section Novel flush system is secretly buried in lid digging in subway station
CN111879485A (en) * 2020-07-31 2020-11-03 无锡市政设计研究院有限公司 Assembled sleeve, monitoring system applying same and sewage leakage monitoring method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08311852A (en) * 1995-05-17 1996-11-26 Shimizu Corp Pumping test method
CN203350002U (en) * 2013-07-11 2013-12-18 瓮福(集团)有限责任公司 Phosphogypsum slag stockyard dam body seepage-proof detection system
CN105201000A (en) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 Wide foundation pit precipitation method capable of remotely monitoring
CN106120701A (en) * 2016-08-23 2016-11-16 河海大学 Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic
CN209523210U (en) * 2018-12-24 2019-10-22 上海长凯岩土工程有限公司 A section Novel flush system is secretly buried in lid digging in subway station
CN109541183A (en) * 2018-12-29 2019-03-29 昆明理工大学 A kind of protector for sensor detecting open-pit mine blast deep ground moisture content
CN111879485A (en) * 2020-07-31 2020-11-03 无锡市政设计研究院有限公司 Assembled sleeve, monitoring system applying same and sewage leakage monitoring method

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