CN113898412A - Freeze-induced expansion force monitoring method based on subway horizontal freezing - Google Patents
Freeze-induced expansion force monitoring method based on subway horizontal freezing Download PDFInfo
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- CN113898412A CN113898412A CN202111193367.6A CN202111193367A CN113898412A CN 113898412 A CN113898412 A CN 113898412A CN 202111193367 A CN202111193367 A CN 202111193367A CN 113898412 A CN113898412 A CN 113898412A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 229
- 238000007710 freezing Methods 0.000 title claims abstract description 99
- 230000008014 freezing Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims description 19
- 239000004816 latex Substances 0.000 claims description 7
- 229920000126 latex Polymers 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
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- 239000004576 sand Substances 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
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- 238000007654 immersion Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a frost heaving force monitoring method based on subway horizontal freezing, which comprises the following steps of: firstly, selecting a type of a frost heaving force monitoring sensor; secondly, mounting a frost heaving force monitoring sensor; thirdly, detecting the water tightness of the frost heaving force monitoring pipe; fourthly, marking the hole position of the temperature measuring pipe; fifthly, drilling the frost heaving force monitoring pipe along with the temperature measuring pipe; and sixthly, data acquisition. The invention monitors the frost heaving force by connecting the frost heaving force monitoring pipe provided with the frost heaving force monitoring sensor to the temperature measuring pipe, not only can monitor the frost heaving force outside a freezing range or the stress condition of an engineering structure, but also can monitor the development condition of the frost heaving force inside a freezing ring layer, can effectively improve the construction efficiency, reduce the operation difficulty, effectively avoid the phenomenon of water burst and sand burst caused by monitoring work, and solve the problems of no test element working surface, transmission cable protection, monitoring and construction coordination, monitoring operation risk and the like in the freezing range.
Description
Technical Field
The invention belongs to the technical field of subway tunnel monitoring, and particularly relates to a frost heaving force monitoring method based on subway horizontal freezing.
Background
The freezing method is used as an important measure for stratum reinforcement, is widely applied to urban rail transit engineering, and has a remarkable reinforcement effect particularly in the construction of connection passages of stratums with large water content, silt and sand and the receiving operation of shield starting. However, the formation temperature is sharply reduced by artificial freezing, huge frost heaving force is generated, bad deformation of surrounding building foundations, tunnel linings and station bottom plates can be undoubtedly caused, and the frost heaving force range and the frost heaving ring space form are clear and important for design of the frost wall form and the arrangement mode and protection of the existing building.
In addition, due to the limitation of urban ground sites, a multi-circle horizontal cup type freezing form is adopted in recent years, compared with vertical freezing, the freezing form has few theoretical calculation results of frost heaving influence range and frost heaving force, most of the freezing form is a semi-theoretical semi-empirical formula, and the limitation is large; the original structure and state of the damaged rock-soil mass in the indoor soil sample test are difficult to accurately simulate complicated field stress and underground water conditions, and the test precision is limited; in the field frost heaving force test work, element pre-embedding is generally carried out by means of large working faces such as ground connection walls and pipe pieces, or the frost heaving force is replaced by gushing muddy water pressure by arranging pressure relief holes.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides a frost heaving force monitoring method based on subway horizontal freezing, which is characterized in that a frost heaving force monitoring pipe provided with a frost heaving force monitoring sensor is connected to a temperature measuring pipe to monitor the frost heaving force, so that the frost heaving force outside a freezing range or the stress condition of an engineering structure can be monitored, the development condition of the frost heaving force inside a freezing ring layer can be monitored, the construction efficiency can be effectively improved, the operation difficulty is reduced, the phenomenon of water burst and sand burst caused by monitoring work can be effectively avoided, and the problems of no test element working surface in the freezing range, transmission cable protection, monitoring and construction coordination, monitoring operation risk and the like are solved.
In order to solve the technical problems, the invention adopts the technical scheme that: a frost heaving force monitoring method based on subway horizontal freezing is characterized in that a frost heaving force monitoring device adopted by the method comprises a frost heaving force monitoring pipe connected to a temperature measuring pipe and a plurality of frost heaving force monitoring sensors mounted on the frost heaving force monitoring pipe, the temperature measuring pipe is arranged between two adjacent circles of horizontal freezing pipes and on the outer ring of the outermost circle of horizontal freezing pipe, a plurality of sinking grooves for mounting the frost heaving force monitoring sensors are formed in the frost heaving force monitoring pipe, each sinking groove is a circular pipe welded in the frost heaving force monitoring pipe and one end of each sinking groove is closed, and a through hole for a measuring lead of the frost heaving force monitoring sensor to pass through is formed in the wall of each sinking groove;
the method comprises the following steps:
the method comprises the following steps of firstly, selecting a frost heaving force monitoring sensor: according to the on-site construction requirements of the constructed subway, selecting a miniature resistance type soil pressure cell capable of working in a low-temperature environment of-30-50 ℃ as a frost heaving force monitoring sensor for the horizontal freezing of the constructed subway;
step two, mounting a frost heaving force monitoring sensor: a frost heaving force monitoring sensor is arranged in each sinking groove, a measuring lead of the frost heaving force monitoring sensor is led into the frost heaving force monitoring pipe through a through hole in the sinking groove, the measuring lead is arranged in the frost heaving force monitoring pipe, waterproof latex is filled between the frost heaving force monitoring sensor and the wall of the sinking groove for sealing, a waterproof adhesive tape is pasted on the outer side of the frost heaving force monitoring sensor, and the measuring lead and the wall of the through hole of the sinking groove are sealed through the waterproof latex;
thirdly, detecting the water tightness of the frost heaving force monitoring pipe;
step four, marking the hole positions of the temperature measuring tubes: marking the hole position of each temperature measuring tube at the designed position of each temperature measuring tube;
fifthly, drilling the frost heaving force monitoring pipe along with the temperature measuring pipe: the temperature measuring pipe comprises two assembled temperature measuring pipe sections, the frost heaving force monitoring pipe is connected between the two assembled temperature measuring pipe sections, each assembled temperature measuring pipe section comprises one or more temperature measuring pipe sections, a drilling machine is adopted to horizontally flush the frost heaving force monitoring pipe and the temperature measuring pipe sections in a following drilling manner according to a set sequence at each temperature measuring pipe hole position marked in the fourth step, and the frost heaving force monitoring pipe is positioned in a cup bottom freezing area of the long-wall cup-shaped frost wall;
the two adjacent temperature measuring pipe sections are welded, and the frost heaving force monitoring pipe and the two temperature measuring pipe sections connected with the frost heaving force monitoring pipe are fixed in a screw thread welding mode;
step six, data acquisition: after the temperature measuring pipe is integrally drilled and constructed, the measuring lead in the frost heaving force monitoring pipe is pulled out of the temperature measuring pipe and is connected with a strain data acquisition instrument, and frost heaving force monitoring data are acquired at least once every day through the strain data acquisition instrument.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps of: the frost heaving force monitoring pipe and the temperature measuring pipe are both round pipes, and the outer diameters of the frost heaving force monitoring pipe and the temperature measuring pipe are the same.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps of: four frost heaving force monitoring sensors are mounted on the frost heaving force monitoring pipe, and the distances from the four frost heaving force monitoring sensors to the diaphragm wall are 0.2m, 0.6m, 1m and 1.4m respectively.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps of: in the first step, the selected miniature resistance-type soil pressure cell is subjected to sensitivity detection in a low-temperature test box at the temperature of-30-50 ℃ to ensure that the miniature resistance-type soil pressure cell can meet the temperature requirement of a frost heaving force test.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps of: and in the second step, the size of the frost heaving force monitoring sensor is matched with the internal size of the sinking groove.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps of: and in the third step, when the water tightness of the frost heaving force monitoring pipe is detected, sealing two ends of the frost heaving force monitoring pipe by adopting flanges, gaskets and bolts, reserving a water inlet at one end of the frost heaving force monitoring pipe, flushing water into the frost heaving force monitoring pipe by adopting a manual pressure test pump, slowly pressurizing, when the pressure in the frost heaving force monitoring pipe reaches 50% of the test pressure, if the frost heaving force monitoring pipe has no water leakage, continuously pressurizing step by step according to 10% of the test pressure, stabilizing the pressure at each step for 2 minutes, checking the leakage of the frost heaving force monitoring pipe until the pressure test pressure in the frost heaving force monitoring pipe stabilizes the pressure for 5 minutes, and if the frost heaving force monitoring pipe has no water leakage, indicating that the water tightness of the frost heaving force monitoring pipe is good.
The frost heaving force monitoring method based on subway horizontal freezing is characterized by comprising the following steps: in the fourth step, two temperature measuring pipe hole positions marked between the horizontal freezing pipe of the secondary outer ring and the horizontal freezing pipe of the outermost ring are symmetrically arranged at two sides of the horizontal freezing pipe of the innermost ring, and two temperature measuring pipe hole positions marked on the outer ring of the horizontal freezing pipe of the outermost ring are symmetrically arranged at two sides of the horizontal freezing pipe of the innermost ring.
Compared with the prior art, the invention has the following advantages:
1. before the frost heaving force monitoring sensor is installed, the temperature of the frost heaving force monitoring sensor is tested, the frost heaving force monitoring sensor can be used in an environment of-30-50 ℃, and the temperature requirement of the frost heaving force test can be met.
2. According to the invention, the plurality of sinking grooves for mounting the frost heaving force monitoring sensors are arranged on the outer side of the frost heaving force monitoring pipe, so that the monitoring operation and the normal construction operation can be coordinated, the loss rate of the frost heaving force monitoring sensors is greatly reduced, and the construction progress is not influenced.
3. According to the invention, the frost heaving force monitoring pipe is connected to the temperature measuring pipe, so that the mounting of the frost heaving force monitoring pipe can be completed simultaneously when the temperature measuring pipe is mounted, the construction efficiency can be effectively improved, the element pre-embedding is not required by means of large operation surfaces such as a ground connecting wall and a duct piece, the operation difficulty is greatly reduced, and the method is suitable for the frost heaving force monitoring of a multi-turn horizontal freezing mode.
4. According to the invention, the plurality of frost heaving force monitoring pipes are arranged in the freezing area of the subway, so that not only can the frost heaving force or engineering structure stress condition outside the freezing range be monitored, but also the development condition of the frost heaving force inside the freezing ring layer can be monitored.
5. According to the invention, the frost heaving force monitoring sensor is arranged on the frost heaving force monitoring pipe through the sinking groove 3-1, and the measuring lead of the frost heaving force monitoring sensor is arranged in the temperature measuring pipe, so that the problems of no testing element working surface in a freezing range, transmission cable protection, monitoring and construction coordination, monitoring operation risk and the like are solved.
In conclusion, the invention monitors the frost heaving force by connecting the frost heaving force monitoring pipe provided with the frost heaving force monitoring sensor on the temperature measuring pipe, not only can monitor the frost heaving force outside the freezing range or the stress condition of the engineering structure, but also can monitor the development condition of the frost heaving force inside the freezing ring layer, can effectively improve the construction efficiency, reduce the operation difficulty, effectively avoid the phenomenon of water burst and sand gushing caused by monitoring work, and solve the problems of no test element working surface, transmission cable protection, monitoring and construction coordination, monitoring operation risk and the like in the freezing range.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a frost heaving force monitoring device of the present invention.
FIG. 2 is a schematic diagram of the arrangement position of the temperature measuring tube according to the present invention.
FIG. 3 is a schematic view of the mounting structure of the frost heaving force monitoring sensor of the present invention.
FIG. 4 is a block flow diagram of the present invention.
Description of reference numerals:
1-horizontal freezing tube; 2, a temperature measuring tube; 3-monitoring the frost heaving force of the pipe;
3-1-sink tank; 4-a frost heaving force monitoring sensor; 4-1 — measuring wire;
5-diaphragm wall; and 6, acquiring strain data.
Detailed Description
As shown in fig. 1 and 2, a frost heaving force monitoring method based on subway horizontal freezing includes a frost heaving force monitoring pipe 3 connected to a temperature measuring pipe 2 and a plurality of frost heaving force monitoring sensors 4 mounted on the frost heaving force monitoring pipe 3, wherein the frost heaving force monitoring pipe 3 is provided with a plurality of sinking grooves 3-1 for mounting the frost heaving force monitoring sensors 4, the sinking grooves 3-1 are circular pipes welded in the frost heaving force monitoring pipe 3 and having one closed end, the frost heaving force monitoring pipe 3 is provided with measuring ports matched with the open ends of the circular pipes, and the walls of the sinking grooves 3-1 are provided with through holes for allowing measuring wires 4-1 of the frost heaving force monitoring sensors 4 to pass through;
the method comprises the following steps:
the method comprises the following steps of firstly, selecting a frost heaving force monitoring sensor: according to the on-site construction requirement of the constructed subway, selecting a miniature resistance type soil pressure cell capable of working in a low-temperature environment of-30-50 ℃ as a frost heaving force monitoring sensor 4 for the horizontal freezing of the constructed subway;
in actual use, the frost heaving force monitoring sensor 4 is a miniature resistance-type soil pressure cell with the model number of XB-150 and the measurement range of 0-3.5 Mpa, the soil pressure cell is in a full-bridge mode, the size of the soil pressure cell is 27mm multiplied by 10mm, the volume of the soil pressure cell is small, and the requirement of field construction can be met; meanwhile, a 24-bit high-resolution AD conversion chip is adopted, so that the data is stable and reliable, and the construction interference is small.
Before the frost heaving force monitoring sensor 4 is installed, the temperature of the frost heaving force monitoring sensor 4 is tested, and the frost heaving force monitoring sensor 4 can be used in an environment of-30 ℃ to 50 ℃ and can meet the temperature requirement of the frost heaving force test.
Step two, mounting a frost heaving force monitoring sensor: a frost heaving force monitoring sensor 4 is arranged in each sinking groove 3-1, a measuring lead 4-1 of the frost heaving force monitoring sensor 4 is led into the frost heaving force monitoring pipe 3 through a through hole on the sinking groove 3-1, the measuring lead 4-1 is coiled together and placed on the inner side of the frost heaving force monitoring pipe 3, waterproof latex is filled between the frost heaving force monitoring sensor 4 and the sinking groove 3-1 for sealing, a waterproof adhesive tape is pasted on the outer side of the frost heaving force monitoring sensor 4, and the measuring lead 4-1 and the hole wall of the through hole of the sinking groove 3-1 are sealed through the waterproof latex;
during actual use, the multiple sinking grooves 3-1 for mounting the frost heaving force monitoring sensors 4 are formed in the outer side of the frost heaving force monitoring pipe 3, so that the monitoring operation and the normal construction operation can be coordinated, the loss rate of the frost heaving force monitoring sensors 4 is greatly reduced, and the construction progress is not affected.
It should be noted that waterproof latex is filled between the frost heaving force monitoring sensor 4 and the sink groove 3-1 for sealing, so that water leakage can be effectively avoided, and a waterproof adhesive tape is pasted on the outer side of the frost heaving force monitoring sensor 4, so that the frost heaving force monitoring sensor 4 can be prevented from being damaged by water immersion.
Thirdly, detecting the water tightness of the frost heaving force monitoring pipe;
in practical use, the length of the frost heaving force monitoring pipe 3 is preferably 2m, and the frost heaving force monitoring pipe 3 needs to be detected in advance for ensuring that the sink 3-1 position on the frost heaving force monitoring pipe 3 does not leak water after the pipe 3 is drilled with flushing water and is driven into the stratum.
Step four, marking the hole positions of the temperature measuring tubes: marking the hole position of each temperature measuring tube 2 at the designed position; the subway horizontal freezing area comprises four circles of horizontal freezing pipes including a central freezing pipe, the central freezing pipe is regarded as the horizontal freezing pipe of the innermost circle, one temperature measuring pipe 2 is uniformly distributed between the horizontal freezing pipe 1 of the innermost circle and the horizontal freezing pipe 1 of the next inner circle and between the horizontal freezing pipe 1 of the next inner circle and the horizontal freezing pipe 1 of the next outer circle, and two temperature measuring pipes 2 are respectively arranged between the horizontal freezing pipe 1 of the next outer circle and the horizontal freezing pipe 1 of the outermost circle and between the horizontal freezing pipe 1 of the outermost circle and the outer circle of the horizontal freezing pipe 1 of the outermost circle;
in actual use, only one horizontal freezing pipe 1 is arranged at the innermost circle, temperature measuring pipes 2 are arranged between the horizontal freezing pipe 1 at the innermost circle and the horizontal freezing pipe 1 at the next inner circle, between the horizontal freezing pipe 1 at the next inner circle and the horizontal freezing pipe 1 at the next outer circle, between the horizontal freezing pipe 1 at the next outer circle and the horizontal freezing pipe 1 at the outermost circle, and the outer circle of the horizontal freezing pipe 1 at the outermost circle, and meanwhile, the frost heaving force monitoring pipe 3 is connected to the temperature measuring pipes 2, so that the conditions of frost heaving stress inside the frost wall and external soil pressure can be known according to different positions of the temperature measuring pipes 2.
In specific implementation, the subway horizontal freezing adopts a long-wall cup-shaped horizontal freezing mode, and the frost heaving force monitoring pipe 3 is positioned in a freezing area of the cup bottom of the long-wall cup-shaped cup; the reinforced length of the horizontal freezing cup body is 9 meters, the cup bottom is 3 meters, the total number of the horizontal freezing tubes 1 is 53, and the horizontal freezing tubes are arranged in a horizontal soil-entering mode; wherein, the number of the horizontal freezing pipes 1 at the outermost ring is 34, and the length is 9.0 m; the lengths of the secondary outer ring, the secondary inner ring and the central freezing pipe are all 3 m.
Fifthly, drilling the frost heaving force monitoring pipe along with the temperature measuring pipe: the temperature measuring pipe 2 comprises two assembly type temperature measuring pipe sections, the frost heaving force monitoring pipe 3 is connected between the two assembly type temperature measuring pipe sections, each assembly type temperature measuring pipe section comprises one or more temperature measuring pipe sections, a drilling machine is adopted to horizontally flush the frost heaving force monitoring pipe 3 and the temperature measuring pipe sections in a following pipe drilling mode according to a set sequence at each temperature measuring pipe hole position marked in the fourth step, and the frost heaving force monitoring pipe 3 is located in a cup bottom junction area of the long-wall cup-shaped frost soil wall;
the two adjacent temperature measuring pipe sections are welded, and the frost heaving force monitoring pipe 3 and the two temperature measuring pipe sections connected with the frost heaving force monitoring pipe are fixed in a screw thread welding mode;
during the in-service use, through connecting the frozen expansion force monitoring pipe 3 on temperature tube 2, when carrying out the installation of temperature tube 2, can accomplish the installation of frozen expansion force monitoring pipe 3 simultaneously, can effectively improve the efficiency of construction, need not carry out the component with the help of great working face such as ground even wall, section of jurisdiction and pre-buried, the operation degree of difficulty reduces greatly, applicable frozen expansion force monitoring in the form of many circles level.
It should be noted that the frost heaving force monitoring pipe 3 and the field temperature measuring pipe 2 are connected into a whole in an external hoop and welding mode, and the frost heaving force monitoring element can be effectively controlled by flushing and drilling with the pipe after cooling.
Step six, data acquisition: after the temperature measuring pipe 2 is integrally drilled and constructed, the measuring lead 4-1 in the frost heaving force monitoring pipe 3 is pulled out of the temperature measuring pipe 2, the measuring lead 4-1 is connected with the strain data acquisition instrument 6, and frost heaving force monitoring data are acquired at least once every day through the strain data acquisition instrument 6.
During actual use, the frost heaving force monitoring sensor 4 is installed by arranging the sinking groove 3-1 on the frost heaving force monitoring pipe 3, and meanwhile, the measuring lead 4-1 of the frost heaving force monitoring sensor 4 is arranged inside the temperature measuring pipe 2, so that the problems that a working surface without a testing element in a freezing range, transmission cable protection, monitoring and construction coordination, operation risk monitoring and the like are solved.
During specific implementation, the strain data acquisition instrument 6 is preferably a static resistance strain gauge and can acquire and store the frost heaving force signal measured by the frost heaving force monitoring sensor 4.
In this embodiment, the frost heaving force monitoring pipe 3 and the temperature measuring pipe 2 are both circular pipes, the outer diameters of the frost heaving force monitoring pipe 3 and the temperature measuring pipe 2 are the same, and the notch end of the sink groove 3-1 is welded and fixed to a measuring port formed in the frost heaving force monitoring pipe 3.
In actual use, the frost heaving force monitoring pipe 3 and the temperature measuring pipe 2 are both made of 20# low carbon steel seamless steel pipes with the diameter of phi 89mm multiplied by 8 mm.
In specific implementation, the sinking groove 3-1 does not protrude to the outer surface of the frost heaving force monitoring pipe 3, the frost heaving force monitoring pipe 3 and the temperature measuring pipe 2 are coaxially arranged, and the frost heaving force monitoring pipe 3 is parallel to the horizontal freezing pipe 1.
In this embodiment, four frost heaving force monitoring sensors 4 are installed on the frost heaving force monitoring pipe 3, and the distances from the four frost heaving force monitoring sensors 4 to the diaphragm wall 5 are respectively 0.2m, 0.6m, 1m and 1.4 m.
During the in-service use, four frozen expansion force monitoring pipes 3 are all inequality apart from the distance of diaphragm wall 5, can improve frozen expansion force monitoring's accuracy and reliability.
In the first step, the selected miniature resistance-type soil pressure cell is subjected to sensitivity detection in a low-temperature test box at-30 ℃ to 50 ℃ to ensure that the miniature resistance-type soil pressure cell can meet the temperature requirement of the frost heaving force test.
During the in-service use, will select good miniature resistance-type soil pressure cell to carry out sensitivity in advance and detect, can effectively guarantee the reliability of frozen expansion force monitoring, avoid frozen expansion force monitoring sensor 4 measurement accuracy inaccurate and cause the unreliable of measured data.
In the second step, the size of the frost heaving force monitoring sensor 4 is matched with the inner size of the sinking groove 3-1.
During the in-service use, the pressure measuring face of frozen force monitoring sensor 4 does not stand out to the outside of frozen force monitoring pipe 3, can guarantee that frozen force monitoring is reliable when, can also guarantee frozen force monitoring pipe 3's quick drilling, can also guarantee frozen force monitoring sensor 4's life simultaneously.
In this embodiment, in the third step, when performing water tightness detection of the frost heaving force monitoring pipe, the two ends of the frost heaving force monitoring pipe 3 are sealed by using flanges, gaskets and bolts, a water inlet is reserved at one end of the frost heaving force monitoring pipe 3, a manual pressure test pump is used to flush water into the frost heaving force monitoring pipe 3 and slowly pressurize the frost heaving force monitoring pipe, when the pressure in the frost heaving force monitoring pipe 3 reaches 50% of the test pressure, if the frost heaving force monitoring pipe 3 has no water leakage, the pressure continues to be increased step by 10% of the test pressure, each step of pressure stabilization is performed for 2 minutes, and leakage detection is performed on the frost heaving force monitoring pipe 3 until the test pressure in the frost heaving force monitoring pipe 3 is the test pressure, and the pressure is stabilized for 5 minutes, and if the frost heaving force monitoring pipe 3 has no water leakage, it is indicated that the water tightness of the frost heaving force monitoring pipe 3 is good.
When the device is actually used, the frost heaving force monitoring pipe 3 is subjected to water tightness test, so that the quality of a welding seam at the position of the sink groove 3-1 on the frost heaving force monitoring pipe 3 and the sealing effect of the through hole arranged on the sink groove 3-1 and used for a measuring lead to pass through can be effectively guaranteed, and further, the damage or the abnormality of a frost heaving force monitoring element caused by the water leakage phenomenon of the frost heaving force monitoring pipe 3 in the using process can be effectively avoided.
In the fourth step, in this embodiment, the two temperature measuring tube holes marked between the horizontal freezing tube 1 of the next outer ring and the horizontal freezing tube 1 of the outermost ring are symmetrically arranged on both sides of the horizontal freezing tube 1 of the innermost ring, and the two temperature measuring tube holes marked on the outer ring of the horizontal freezing tube 1 of the outermost ring are symmetrically arranged on both sides of the horizontal freezing tube 1 of the innermost ring.
In actual use, the number of the horizontal freezing pipes 1 at the innermost circle is only one, and the horizontal freezing pipes are called as central freezing pipes.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A frost heaving force monitoring method based on subway horizontal freezing is characterized in that a frost heaving force monitoring device adopted by the method comprises a frost heaving force monitoring pipe (3) connected with a temperature measuring pipe (2) and a plurality of frost heaving force monitoring sensors (4) arranged on the frost heaving force monitoring pipe (3), the temperature measuring pipes (2) are arranged between two adjacent circles of horizontal freezing pipes (1) and on the outer ring of the outermost circle of horizontal freezing pipe (1), the frost heaving force monitoring pipe (3) is provided with a plurality of sinking grooves (3-1) for mounting the frost heaving force monitoring sensor (4), the sinking groove (3-1) is a round pipe which is welded in the frost heaving force monitoring pipe (3) and one end of which is closed, a through hole for a measuring lead (4-1) of the frost heaving force monitoring sensor (4) to pass through is formed in the wall of the sinking groove (3-1);
the method comprises the following steps:
the method comprises the following steps of firstly, selecting a frost heaving force monitoring sensor: according to the on-site construction requirement of the constructed subway, selecting a miniature resistance type soil pressure cell capable of working in a low-temperature environment of-30-50 ℃ as a frost heaving force monitoring sensor (4) for the horizontal freezing of the constructed subway;
step two, mounting a frost heaving force monitoring sensor: a frost heaving force monitoring sensor (4) is arranged in each sinking groove (3-1), a measuring lead (4-1) of the frost heaving force monitoring sensor (4) is led into the frost heaving force monitoring pipe (3) through a through hole in the sinking groove (3-1), the measuring lead (4-1) is arranged in the frost heaving force monitoring pipe (3), waterproof latex is filled between the frost heaving force monitoring sensor (4) and the wall of the sinking groove (3-1) for sealing, a waterproof adhesive tape is pasted on the outer side of the frost heaving force monitoring sensor (4), and the measuring lead (4-1) and the wall of the through hole in the sinking groove (3-1) are sealed through the waterproof latex;
thirdly, detecting the water tightness of the frost heaving force monitoring pipe;
step four, marking the hole positions of the temperature measuring tubes: marking the hole position of each temperature measuring tube (2);
fifthly, drilling the frost heaving force monitoring pipe along with the temperature measuring pipe: the temperature measuring pipe (2) comprises two assembled temperature measuring pipe sections, the frost heaving force monitoring pipe (3) is connected between the two assembled temperature measuring pipe sections, each assembled temperature measuring pipe section comprises one or more temperature measuring pipe sections, a drilling machine is adopted to horizontally flush the frost heaving force monitoring pipe (3) and the temperature measuring pipe sections in a following pipe drilling mode according to a set sequence at each temperature measuring pipe hole position marked in the fourth step, and the frost heaving force monitoring pipe (3) is located in a cup bottom freezing area of the long-wall cup-shaped frozen soil wall;
the two adjacent temperature measuring pipe sections are welded, and the frost heaving force monitoring pipe (3) and the two temperature measuring pipe sections connected with the frost heaving force monitoring pipe are fixed in a threaded and welded mode;
step six, data acquisition: after the temperature measuring pipe (2) is integrally drilled, the measuring lead (4-1) in the frost heaving force monitoring pipe (3) is pulled out of the temperature measuring pipe (2), the measuring lead (4-1) is connected with a strain data acquisition instrument (6), and frost heaving force monitoring data is acquired at least once every day through the strain data acquisition instrument (6).
2. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: the frost heaving force monitoring pipe (3) and the temperature measuring pipe (2) are round pipes, and the outer diameters of the frost heaving force monitoring pipe (3) and the temperature measuring pipe (2) are the same.
3. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: four frost heaving force monitoring sensors (4) are mounted on the frost heaving force monitoring pipe (3), and the distances from the frost heaving force monitoring sensors (4) to the diaphragm wall (5) are respectively 0.2m, 0.6m, 1m and 1.4 m.
4. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: in the first step, the selected miniature resistance-type soil pressure cell is subjected to sensitivity detection in a low-temperature test box at the temperature of-30-50 ℃ to ensure that the miniature resistance-type soil pressure cell can meet the temperature requirement of a frost heaving force test.
5. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: in the second step, the size of the frost heaving force monitoring sensor (4) is matched with the inner size of the sinking groove (3-1).
6. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: and in the third step, when the water tightness of the frost heaving force monitoring pipe is detected, sealing two ends of the frost heaving force monitoring pipe (3) by adopting flanges, gaskets and bolts, reserving a water inlet at one end of the frost heaving force monitoring pipe (3), flushing water into the frost heaving force monitoring pipe (3) by adopting a manual pressure test pump, slowly pressurizing, when the pressure in the frost heaving force monitoring pipe (3) reaches 50% of the test pressure, if the frost heaving force monitoring pipe (3) does not leak water, continuously increasing the pressure step by step according to 10% of the test pressure, stabilizing the pressure for 2 minutes at each step, and checking the leakage of the frost heaving force monitoring pipe (3) until the test pressure in the frost heaving force monitoring pipe (3) stabilizes the pressure for 5 minutes, and if the frost heaving force monitoring pipe (3) does not leak water, the frost heaving force monitoring pipe (3) is good in water tightness.
7. The frost heaving force monitoring method based on subway horizontal freezing according to claim 1, characterized in that: in the fourth step, two temperature measuring pipe hole positions marked between the horizontal freezing pipe (1) of the secondary outer ring and the horizontal freezing pipe (1) of the outermost ring are symmetrically arranged at two sides of the horizontal freezing pipe (1) of the innermost ring, and two temperature measuring pipe hole positions marked on the outer ring of the horizontal freezing pipe (1) of the outermost ring are symmetrically arranged at two sides of the horizontal freezing pipe (1) of the innermost ring.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116558576A (en) * | 2023-07-10 | 2023-08-08 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
| CN116608009A (en) * | 2023-05-31 | 2023-08-18 | 安徽建筑大学 | Method for monitoring layering freezing and grouting reinforcement effects in real time |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748005A (en) * | 2012-07-13 | 2012-10-24 | 中煤矿山建设集团有限责任公司 | System for monitoring temperature, stress and deformation of frozen wall of shaft in real time and laying method thereof |
| CN202731906U (en) * | 2012-07-13 | 2013-02-13 | 中煤矿山建设集团有限责任公司 | System for monitoring temperature, stress and deformation of shaft freezing wall in real time |
| CN203587587U (en) * | 2013-10-08 | 2014-05-07 | 大连海事大学 | Real-time online testing device of saturated rock frost heaving force |
| CN103868638A (en) * | 2014-03-27 | 2014-06-18 | 水利部交通运输部国家能源局南京水利科学研究院 | Frost heaving force measuring device and method |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN113049628A (en) * | 2021-04-09 | 2021-06-29 | 中铁上海设计院集团有限公司 | Swelling soil wet swelling-frost heaving force combined tester |
-
2021
- 2021-10-13 CN CN202111193367.6A patent/CN113898412B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748005A (en) * | 2012-07-13 | 2012-10-24 | 中煤矿山建设集团有限责任公司 | System for monitoring temperature, stress and deformation of frozen wall of shaft in real time and laying method thereof |
| CN202731906U (en) * | 2012-07-13 | 2013-02-13 | 中煤矿山建设集团有限责任公司 | System for monitoring temperature, stress and deformation of shaft freezing wall in real time |
| CN203587587U (en) * | 2013-10-08 | 2014-05-07 | 大连海事大学 | Real-time online testing device of saturated rock frost heaving force |
| CN103868638A (en) * | 2014-03-27 | 2014-06-18 | 水利部交通运输部国家能源局南京水利科学研究院 | Frost heaving force measuring device and method |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN113049628A (en) * | 2021-04-09 | 2021-06-29 | 中铁上海设计院集团有限公司 | Swelling soil wet swelling-frost heaving force combined tester |
Non-Patent Citations (1)
| Title |
|---|
| 吴玮;: "地铁建设中浅覆土冻结法加固冻胀控制技术", 中国高新科技, no. 05 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116608009A (en) * | 2023-05-31 | 2023-08-18 | 安徽建筑大学 | Method for monitoring layering freezing and grouting reinforcement effects in real time |
| CN116608009B (en) * | 2023-05-31 | 2024-04-09 | 安徽建筑大学 | Method for monitoring layering freezing and grouting reinforcement effects in real time |
| CN116558576A (en) * | 2023-07-10 | 2023-08-08 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
| CN116558576B (en) * | 2023-07-10 | 2023-10-13 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
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