CN109577392B - Underground continuous wall joint leakage monitoring and repairing device and method based on optical fiber temperature measurement - Google Patents
Underground continuous wall joint leakage monitoring and repairing device and method based on optical fiber temperature measurement Download PDFInfo
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- CN109577392B CN109577392B CN201910054095.8A CN201910054095A CN109577392B CN 109577392 B CN109577392 B CN 109577392B CN 201910054095 A CN201910054095 A CN 201910054095A CN 109577392 B CN109577392 B CN 109577392B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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Abstract
The invention discloses a leakage monitoring and repairing device for a joint of a diaphragm wall based on optical fiber temperature measurement, which comprises a hollow flower pipe, wherein the hollow flower pipe extends along a joint of the diaphragm wall, the hollow flower pipe is fixed in a groove of an H-shaped steel joint facing a subsequent groove section of the diaphragm wall through a positioning steel ring, a heating belt is arranged in the hollow flower pipe along the longitudinal direction of the hollow flower pipe, an optical fiber installation straight line groove is formed in the heating belt along the longitudinal direction of the heating belt, an optical fiber temperature sensor is arranged in the optical fiber installation straight line groove, the optical fiber temperature sensor is connected with a multichannel optical fiber demodulator through a connecting optical fiber, and the heating belt is connected with a temperature controller. The invention also discloses a method for monitoring and repairing the leakage of the underground diaphragm wall joint based on the optical fiber temperature measurement, which realizes the advanced detection, monitoring and repairing of the leakage water at the joint of the slot section of the underground diaphragm wall and can prevent the safety risk caused by the leakage after excavation.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering detection, monitoring and dangerous situation restoration, and particularly relates to a device for monitoring and restoring leakage of a joint of a diaphragm wall based on optical fiber temperature measurement, and a method for monitoring and restoring leakage of a joint of a diaphragm wall based on optical fiber temperature measurement.
Background
Because of the high rigidity, good integrity and good impermeability of the wall body, the underground diaphragm wall is recognized as the best supporting structure in deep foundation pit engineering. However, the underground diaphragm wall is constructed by dividing the groove sections, and the leakage problem is frequent because the joint of the groove sections is not compact due to concrete pouring, so that the underground diaphragm wall becomes one of key induction factors of safety accidents of the underground diaphragm wall. Advanced detection, real-time monitoring and in-situ restoration of water leakage at the joint of the trough section are key technical problems to be solved in the construction process of the underground continuous wall at present. The conventional foundation pit leakage detection methods comprise an open cut method, a high-density resistivity method, a temperature tracing method, an ultrasonic detection method and the like, but the methods have the limitations of high cost, poor anti-interference capability, strong environment dependence and the like, and cannot be well applied to leakage detection and monitoring at the joints of the slot sections of the underground continuous walls. Compared with the traditional method, the leakage detection method of the optical fiber temperature sensing technology has the following advantages: (1) The problem of detection missing and report missing dangerous cases caused by the characteristic of space discontinuity is solved; (2) The characteristics of exquisite and soft optical fiber can not influence the performance and mechanical parameters of the embedded part; (3) The optical fiber also has the characteristic of easy formation of a telemetry automation system. Although the underground diaphragm wall leakage detection device described in patent number CN107727271a relates to the optical fiber temperature measurement technology, the device is provided with optical fibers uniformly in the whole underground diaphragm wall instead of being arranged at the joints of the groove sections where leakage easily occurs, the number of the required optical fibers is extremely large, the pertinence is not strong, and leakage detection and leakage reporting danger can occur; in addition, the device achieves the aim of improving the temperature difference between seepage water and the optical fiber by heating the soil body behind the wall, the range of the soil body needing to be heated is large, and the construction cost is high; in addition, the device does not relate to the repair technology of the leakage points. Therefore, it is necessary to invent a new underground diaphragm wall leakage detection, monitoring and plugging repair device based on optical fiber temperature measurement.
Disclosure of Invention
The invention aims to provide a device for monitoring and repairing the leakage of a joint of a diaphragm wall based on optical fiber temperature measurement and a method for monitoring and repairing the leakage of the joint of the diaphragm wall based on optical fiber temperature measurement, aiming at overcoming the defects and shortcomings of the prior art, and the device is simple in construction process and low in cost, and can perform repair construction in situ.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a ground continuous wall seam seepage monitoring prosthetic devices based on optic fibre temperature measurement, including I-shaped steel joint, the slot part of I-shaped steel joint both sides is connected with the steel reinforcement cage of the preceding slot section of underground continuous wall and the steel reinforcement cage of the following slot section of underground continuous wall respectively, be the underground continuous wall joint line between preceding slot section of underground continuous wall and the following slot section of underground continuous wall, I-shaped steel joint extends along the underground continuous wall joint line, still include hollow colored pipe, hollow colored pipe extends along the underground continuous wall joint line, hollow colored pipe passes through the location steel ring to be fixed in the groove of I-shaped steel joint towards the following slot section of underground continuous wall, be provided with the heating band along hollow colored pipe longitudinal direction in the hollow colored pipe, the fiber optic setting straight line groove has been seted up along the longitudinal direction of heating band on the heating band, be provided with fiber temperature sensor in the fiber optic setting straight line groove, fiber temperature sensor is connected with multichannel fiber optic demodulator through connecting fiber, the heating band is connected with temperature controller.
A plurality of water stop rubber plugs are arranged in the hollow flower pipe along the longitudinal direction of the hollow flower pipe, and the bottom end of the hollow flower pipe is provided with a sealing head.
The hollow flower pipe as described above is composed of a plurality of hollow flower pipe sections, and the respective hollow flower pipe sections are connected by a pipe clamp.
The underground diaphragm wall joint leakage monitoring and repairing device based on the optical fiber temperature measurement further comprises a first sleeve valve pipe extending along the underground diaphragm wall joint, wherein the first sleeve valve pipe is fixed in a groove of the H-shaped steel joint facing the subsequent groove section of the underground diaphragm wall through a positioning steel ring.
The underground diaphragm wall joint leakage monitoring and repairing device based on the optical fiber temperature measurement further comprises a second sleeve valve pipe arranged on the earth facing side of the underground diaphragm wall joint.
The heating range of the heating belt is 40-80 ℃.
The method for monitoring and repairing the leakage of the joint of the underground continuous wall based on the optical fiber temperature measurement comprises the following steps:
step 1, controlling a heating belt to heat to a set temperature through a temperature controller;
step 2, reading the temperature of each measuring point of the optical fiber temperature sensor through a multichannel optical fiber demodulator, and calculating the average value of the temperature of each measuring point of the heating belt as a measuring temperature average value;
step 3, if the difference value between the temperature of each measuring point of the optical fiber temperature sensor and the temperature average value of the heating belt is smaller than a set difference value threshold value, no leakage occurs in the part of the connecting seam of the underground continuous wall corresponding to each measuring point of the optical fiber temperature sensor, and the monitoring is finished;
if the difference value between the temperature of one or more measuring points of the optical fiber temperature sensor and the temperature average value of the heating belt is greater than or equal to a set difference value threshold value, the corresponding part of the connecting joint of the underground continuous wall is leaked, and the step 4 is entered;
step 4, if the grouting leakage repairing is not carried out through the first sleeve valve pipe, the grouting leakage repairing is carried out through the first sleeve valve pipe, and the first sleeve valve pipe returns to the step 1 after the grouting leakage repairing is carried out;
if the first sleeve valve pipe is used for grouting and repairing leakage, drilling is carried out on the earth facing side of the connecting joint of the underground diaphragm wall, a second sleeve valve pipe is arranged, and grouting and repairing leakage is carried out through the second sleeve valve pipe.
Compared with the prior art, the invention has the following beneficial effects: the method realizes advanced detection, monitoring and repair of the leakage water at the joint of the underground continuous wall groove section, can prevent the safety risk caused by leakage after excavation, and has the advantages of strong pertinence, simple construction process and low cost.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a schematic longitudinal section of a hollow tube.
FIG. 3 is a schematic cross-sectional view of a heating belt.
In the figure: 1-hollow flowtube, 2-water stop rubber plug, 3-heating belt, 4-connection optical fiber, 5-pipe hoop, 6-220V alternating current power supply, 7-temperature controller, 8-multichannel optical fiber demodulator, 9-optical fiber temperature sensor, 10-positioning steel ring, 11-I-shaped steel joint, 12-underground continuous wall advance groove section, 13-underground continuous wall follow-up groove section, 14-temperature information management system, 15-high pressure grouting pump, 16-first sleeve valve pipe, 17-second sleeve valve pipe, 18-earth facing side, 19-earth facing side, 20-end socket, 21-optical fiber installation straight line groove.
Detailed Description
The present invention will be further described in detail below in conjunction with the following examples, for the purpose of facilitating understanding and practicing the present invention by those of ordinary skill in the art, it being understood that the examples described herein are for the purpose of illustration and explanation only and are not intended to limit the invention.
Example 1:
the underground diaphragm wall joint leakage monitoring and repairing device based on optical fiber temperature measurement comprises an I-shaped steel joint 11, groove parts at two sides of the I-shaped steel joint 11 are respectively connected with a reinforcement cage of an advance groove section 12 of an underground diaphragm wall and a reinforcement cage of a subsequent groove section 13 of the underground diaphragm wall, an underground diaphragm wall connecting joint is arranged between the advance groove section 12 of the underground diaphragm wall and the subsequent groove section 13 of the underground diaphragm wall, the I-shaped steel joint 11 extends along the underground diaphragm wall connecting joint, and the device is characterized by also comprising a hollow flower pipe 1, the hollow flower pipe 1 extends along the underground diaphragm wall connecting joint, the hollow flower pipe 1 is fixed in a groove of the I-shaped steel joint 11 facing the subsequent groove section 13 of the underground diaphragm wall through a positioning steel ring 10, a heating belt 3 is arranged in the hollow flower pipe 1 along the longitudinal direction, an optical fiber installation straight line groove 21 is arranged in the heating belt 3 along the longitudinal direction, an optical fiber temperature sensor 9 is arranged in the heating belt 3, the optical fiber installation straight line groove 21, the optical fiber temperature sensor 9 is connected with a multichannel demodulator 8 through a connecting optical fiber 4, and the heating belt 3 is connected with a temperature controller 7.
A plurality of water stop rubber plugs 2 are arranged in the hollow flower pipe 1 along the longitudinal direction of the hollow flower pipe 1, and a sealing head 20 is arranged at the bottom end of the hollow flower pipe 1.
The hollow tube 1 is composed of a plurality of hollow tube sections, and the hollow tube sections are connected through a pipe hoop 5.
The underground diaphragm wall joint leakage monitoring and repairing device based on the optical fiber temperature measurement further comprises a first sleeve valve pipe 16 extending along the underground diaphragm wall joint, wherein the first sleeve valve pipe 16 is fixed in a groove of the I-shaped steel joint 11 facing the subsequent groove section 13 of the underground diaphragm wall through a positioning steel ring 10.
The underground diaphragm wall joint leakage monitoring and repairing device based on the optical fiber temperature measurement further comprises a second sleeve valve pipe 17 which is arranged on the earth facing side 18 of the underground diaphragm wall joint.
The heating range of the heating belt 3 is 40-80 ℃.
The diameter of the hollow flower pipe section is 20-40 mm,
the water stop rubber plug 2 is arranged at intervals of 1.0-2.0 m.
The heating belt 3 can generate heat and raise temperature after being electrified, and a temperature distribution belt from top to bottom is formed at the connecting joint of the underground continuous wall.
The temperature controller 7 is used to control the temperature of the heating belt 3. The heating belt 3 passes through the water stop rubber plug 2 and is arranged at the center of the hollow flower pipe 1, and the heating belt 3 and the water stop rubber plug 2 are sealed by water swelling water stop glue.
The optical fiber temperature sensor 9 is used for measuring the temperature of each measuring point of the connecting joint of the underground diaphragm wall from top to bottom, and the temperature resolution is not lower than 0.5 ℃. The optical fiber temperature sensor 9 can be a temperature measuring optical fiber along the longitudinal direction of the connecting seam of the underground diaphragm wall, or a plurality of temperature measuring optical fiber sections distributed at each measuring point of the connecting seam of the underground diaphragm wall from top to bottom, wherein each temperature measuring optical fiber section is arranged at intervals of a certain distance (1.0-2.0 m), and the interval of the temperature measuring optical fiber sections is consistent with the interval of the water stop rubber plug 2.
The connecting optical fiber is used for transmitting the temperature of each measuring point of the underground diaphragm wall connecting joint measured by the optical fiber temperature sensor 9 to the multichannel optical fiber demodulator (8),
the multichannel optical fiber demodulator 8 is a device capable of demodulating optical wavelength information through mutual conversion of wavelength and voltage so as to achieve the aim of temperature parameter demodulation, and the sampling frequency is not lower than 1HZ.
Obtaining leakage rate corresponding to the position according to the temperature and the position corresponding to the temperature, wherein the leakage rate is obtained based on the following formula:
ΔT＝136.83ν-0.2843
wherein: delta T is the temperature drop rate, unit ℃/s; v is leakage rate in cm/s.
The temperature information management system 14 is further configured to issue the position of the detection point, the temperature corresponding to the detection point, and the leakage rate corresponding to the detection point to a construction manager, so that the construction manager can quickly and effectively make a dangerous case repair scheme.
The method for monitoring and repairing the leakage of the joint of the underground continuous wall based on the optical fiber temperature measurement comprises the following steps:
step 1, controlling the heating belt 3 to heat to a set temperature through a temperature controller 7;
step 2, reading the temperature of each measuring point of the optical fiber temperature sensor 9 through the multichannel optical fiber demodulator 8, and calculating the average value of the temperature of each measuring point of the heating belt 3 as a measuring temperature average value;
step 3, if the difference value between the temperature of each measuring point of the optical fiber temperature sensor 9 and the average value of the temperature of the heating belt is smaller than a set difference value threshold value, no leakage occurs at the part of the connecting seam of the underground continuous wall corresponding to each measuring point of the optical fiber temperature sensor 9, and the monitoring is finished;
if the difference value between the temperature of one or more measuring points of the optical fiber temperature sensor 9 and the temperature average value of the heating belt is greater than or equal to a set difference value threshold value, the corresponding part of the connecting joint of the underground continuous wall is leaked, and the step 4 is entered;
step 4, if the grouting and leak repairing are not performed through the first sleeve valve pipe 16, performing grouting and leak repairing through the first sleeve valve pipe 16, and returning to the step 1 after performing grouting and leak repairing through the first sleeve valve pipe 16;
when the first sleeve valve pipe 16 is subjected to grouting and leak repairing, a hole is drilled on the earth facing side 18 of the connecting joint of the underground diaphragm wall, the second sleeve valve pipe 17 is arranged, and grouting and leak repairing is performed through the second sleeve valve pipe 17.
The second sleeve valve pipe 17 performs supplementary grouting when the first sleeve valve pipe 16 cannot achieve the purpose of plugging after grouting repair. The first sleeve valve pipe 16 performs grouting and leak repairing, and the grouting pressure is controlled to be 0.3-1.2 MPa, preferably 0.5-1.0 MPa.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The underground diaphragm wall joint leakage monitoring and repairing method based on optical fiber temperature measurement is characterized by further comprising a hollow flower pipe (1), wherein the hollow flower pipe (1) extends along the underground diaphragm wall joint, the hollow flower pipe (1) is fixed in a groove of the H-shaped steel joint (11) facing the underground diaphragm wall subsequent groove section (13) through a positioning steel ring (10), a heating belt (3) is arranged in the hollow flower pipe (1) along the longitudinal direction of the hollow flower pipe (1), a connecting joint of the underground diaphragm wall is arranged between the underground diaphragm wall previous groove section (12) and the underground diaphragm wall subsequent groove section (13), the hollow flower pipe (11) extends along the connecting joint of the underground diaphragm wall, a straight line groove (21) is arranged in the heating belt (3) along the longitudinal direction of the heating belt (3), a temperature sensor (7) is arranged in the straight line groove (21) and connected with an optical fiber sensor (9) through an optical fiber demodulation channel (9),
the utility model also comprises a first sleeve valve pipe (16) extending along the connecting seam of the underground diaphragm wall, the first sleeve valve pipe (16) is fixed in the groove of the H-shaped steel joint (11) facing the subsequent groove section (13) of the underground diaphragm wall through a positioning steel ring (10),
also comprises a second sleeve valve pipe (17) arranged on the earth facing side (18) of the connecting joint of the underground diaphragm wall,
the method is characterized by comprising the following steps:
step 1, controlling a heating belt (3) to heat to a set temperature through a temperature controller (7);
step 2, reading the temperature of each measuring point of an optical fiber temperature sensor (9) through a multichannel optical fiber demodulator (8), and calculating the average value of the temperature of each measuring point of a heating belt (3) as a measuring temperature average value;
step 3, if the difference value between the temperature of each measuring point of the optical fiber temperature sensor (9) and the average value of the temperature of the heating belt is smaller than a set difference value threshold value, no leakage occurs in the part of the connecting joint of the underground continuous wall corresponding to each measuring point of the optical fiber temperature sensor (9), and the monitoring is finished;
if the difference value between the temperature of one or more measuring points of the optical fiber temperature sensor (9) and the temperature average value of the heating belt is larger than or equal to a set difference value threshold value, the corresponding part of the connecting joint of the underground continuous wall is leaked, and the step 4 is entered;
step 4, if the grouting leakage repairing is not carried out through the first sleeve valve pipe (16), the grouting leakage repairing is carried out through the first sleeve valve pipe (16), and the first sleeve valve pipe (16) returns to the step 1 after the grouting leakage repairing is carried out;
if the first sleeve valve pipe (16) is used for grouting and repairing leakage, a hole is drilled on the earth facing side (18) of the connecting joint of the underground continuous wall, a second sleeve valve pipe (17) is arranged, and grouting and repairing leakage is performed through the second sleeve valve pipe (17).
2. The method for monitoring and repairing the leakage of the joint of the underground continuous wall based on the optical fiber temperature measurement according to claim 1 is characterized in that a plurality of water stop rubber plugs (2) are arranged in the hollow flower pipe (1) along the longitudinal direction of the hollow flower pipe (1), and a sealing head (20) is arranged at the bottom end of the hollow flower pipe (1).
3. The method for monitoring and repairing the leakage of the joint of the underground continuous wall based on the optical fiber temperature measurement according to claim 2, wherein the hollow flower pipe (1) consists of a plurality of hollow flower pipe sections, and the hollow flower pipe sections are connected through pipe hoops (5).
4. The method for monitoring and repairing the leakage of the joint of the diaphragm wall based on the temperature measurement of the optical fiber according to claim 3, which is characterized in that: the heating range of the heating belt (3) is 40-80 ℃.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110847155A (en) * | 2019-11-22 | 2020-02-28 | 中铁开发投资集团有限公司 | Waterproof seam pretreatment method in underground continuous wall construction process |
| CN112922049A (en) * | 2021-02-01 | 2021-06-08 | 上海建工二建集团有限公司 | Wall integrity detection device and method for underground continuous wall |
| CN113252246B (en) * | 2021-06-18 | 2021-11-05 | 中国科学院武汉岩土力学研究所 | Recoverable underground continuous wall seam crossing leakage detection device |
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