CN116558576A - Method for monitoring stress and temperature of freezing wall in soft soil stratum - Google Patents
Method for monitoring stress and temperature of freezing wall in soft soil stratum Download PDFInfo
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- CN116558576A CN116558576A CN202310833065.3A CN202310833065A CN116558576A CN 116558576 A CN116558576 A CN 116558576A CN 202310833065 A CN202310833065 A CN 202310833065A CN 116558576 A CN116558576 A CN 116558576A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 133
- 230000008014 freezing Effects 0.000 title claims abstract description 42
- 238000007710 freezing Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002689 soil Substances 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 40
- 239000003822 epoxy resin Substances 0.000 claims abstract description 36
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000005253 cladding Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000011161 development Methods 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 3
- 238000004181 pedogenesis Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention relates to a method for monitoring the stress and the temperature of a freezing wall in a soft soil stratum, which comprises the following steps: manufacturing a stress monitoring tube, wherein the stress monitoring tube comprises an epoxy resin cylinder, an internal thread metal ring, an epoxy resin outer cladding layer and an inner lining ring; manufacturing a temperature monitoring tube, wherein the temperature monitoring tube comprises a temperature sensor and a metal tube; measuring and lofting and perforating the temperature measuring hole; jacking a first-stage temperature measuring tube; jacking the monitoring pipe section, namely jacking the connected stress monitoring pipe and temperature monitoring pipe into a soil layer; jacking a subsequent temperature measuring tube; after the freezing wall is formed, the lining ring sealing top block is pulled out by a steel wire rope, and stress monitoring and temperature monitoring are started; the frozen wall stress monitoring is temperature calibrated. The invention can realize the monitoring of the three-dimensional stress and the temperature of the same point of the freezing wall in the construction process, is favorable for grasping the stress state of the freezing wall, and provides a basis for researching the temperature field and the stress field of the freezing wall.
Description
Technical Field
The invention relates to the technical field of tunnel freezing method construction monitoring, in particular to a method for monitoring the stress and the temperature of a freezing wall in a soft soil stratum.
Background
The freezing method technology makes water in stratum ice, changes natural rock and soil into frozen soil, increases the strength and stability, and isolates the connection between underground water and underground engineering so as to carry out underground engineering construction under the protection of freezing walls. The freezing method has the characteristics of water stopping property, higher frozen soil strength, adaptability to complex stratum and the like, and becomes a main construction method of the subway communication channel.
The temperature development rule of the frozen soil curtain and the formation condition of the frozen curtain relate to the safety of construction by a freezing method, and the freezing method monitoring technology not only provides guarantee for the construction safety, but also provides reliable data for further researching the physical and mechanical properties and stress analysis of the frozen wall. The monitoring of the current freezing method construction mainly comprises temperature monitoring and frost heaving force monitoring, wherein the temperature monitoring generally adopts a temperature measuring cable as a sensor, and the frost heaving force monitoring adopts a mode of embedding a soil pressure box. However, the conventional monitoring technology only meets the requirement of temperature monitoring, and less technology for simultaneously monitoring the stress of the freezing wall exists.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for monitoring the stress and the temperature of a freezing wall in a soft soil stratum.
The invention adopts the following technical scheme to realize the aim:
a method for monitoring the stress and temperature of a freezing wall in a soft soil stratum comprises the following specific steps:
s1, manufacturing stress monitoring tube
The stress monitoring tube comprises an epoxy resin cylinder, wherein two ends of the epoxy resin cylinder are provided with internal thread metal rings, an epoxy resin outer cladding is poured outside the internal thread metal rings and the epoxy resin cylinder, an inner lining ring is arranged inside the epoxy resin cylinder, one end face of the inner lining ring is provided with a ring welded with a steel wire rope, and the steel wire rope is bound on the ring;
three groups of strain gauges are poured on the inner circumference of the side wall of the epoxy resin cylinder, the included angle between the three groups of strain gauges is 120 degrees, each group of strain gauges consists of four strain gauges, the four strain gauges are mutually spaced by 45 degrees, and strain monitoring wires of the strain gauges are led out from the side wall of the epoxy resin cylinder;
s2, manufacturing temperature monitoring tube
The temperature monitoring tube comprises a metal tube, an inner thread is arranged on the inner wall of one end part of the metal tube, an outer thread is arranged on the outer wall of the other end part of the metal tube, the outer thread end of the metal tube is connected with an inner thread metal ring of the stress monitoring tube, three steel plates are welded on the inner wall of the metal tube at one end close to the stress monitoring tube to form a mounting groove, a temperature sensor is packaged in a metal round rod and is placed in the mounting groove, and a lead of the temperature sensor is led out from a tube orifice of the metal tube;
s3, measuring, lofting and perforating the temperature measuring hole
Measuring and determining a hole site center point of the hole site by using a steel tape according to the design distance between the hole site of the freezing hole and the reference cross line, marking the hole site center cross line by using red paint, then perforating the tunnel segment by using a perforating drill, and connecting a control valve after installing the hole site pipe;
s4, jacking the first-section temperature measuring tube
The ejector rod is connected with a guide head of the head part of the freezing pipe, one end of the guide head is a conical head, the other end of the guide head is connected with a first-section temperature measuring pipe, a piston of the push bench is connected with the tail end of the ejector rod, a hydraulic pump is started, when the piston of the hydraulic cylinder stretches, an ejector force is applied to the ejector rod, and the ejector force is transmitted to the guide head of the head part of the freezing pipe through the ejector rod and drives the first-section temperature measuring pipe to enter a stratum;
s5, monitoring jacking of pipe section
One end of a temperature monitoring pipe is connected with a first-section temperature measuring pipe, the other end of the temperature monitoring pipe is connected with a stress monitoring pipe, a ruler adding rod is added between a push rod and a top cap of the push bench, and the stress monitoring pipe and the temperature monitoring pipe are pushed into a soil layer;
s6, continuously jacking
Connecting the other end of the stress monitoring tube with a subsequent temperature measuring tube, continuing to extend the push rod of the push bench, pushing the subsequent temperature measuring tube, removing the push bench after the push rod reaches the design depth, pulling out the push rod, leading out the steel wire rope of the inner lining ring, leading out the wire of the temperature monitoring tube, connecting the wire with the temperature measuring module and the converter, transmitting the wire to a computer, and leading out the strain monitoring wire to be connected with the strain gauge;
s7, monitoring
After the frozen wall is formed, the local structure of the lining ring is pulled out by a steel wire rope, the constraint of the lining ring on the epoxy resin cylinder is released, the stress monitoring and the temperature monitoring are started, and the further development of the frozen wall and the temperature and stress development in the excavation process are monitored;
s8, performing temperature calibration on the frozen wall stress monitoring
The strain gauge and the strain monitoring wire in the stress monitoring tube are affected by temperature, the strain monitoring tube with the same specification is connected with the strain monitoring wire with the same length according to the monitored freezing wall temperature, and the strain monitoring tube is placed in a freezer with the same temperature to monitor stress and serve as temperature compensation for monitoring the stress of the freezing wall.
In the step S1, the outer diameter of the epoxy resin cylinder is 106mm, and the wall thickness is 7mm; the external diameter of the internal thread metal ring is 106mm, the wall thickness is 7mm, and the internal thread is arranged on the inner wall; the outer diameter of the epoxy overclad was 108mm and the wall thickness was 1mm.
In the step S1, the outer diameter of the lining ring is 92mm, the wall thickness is 8mm, the length of the lining ring is the same as that of the epoxy resin cylinder, the lining ring is cut into three lining ring pieces by a seamless steel pipe, one lining ring piece is a jacking block, the other two lining ring pieces are adjacent blocks, the ring of the binding steel wire rope is welded at the end part of the jacking block, and the one lining ring piece is the jacking block and the two lining ring pieces are assembled inside the epoxy resin cylinder.
In the step S2, the metal pipe is manufactured by adopting a seamless steel pipe with the diameter of 108mm and the thickness of 8 mm.
In step S2, the temperature sensor is a digital temperature sensor DS18B20.
In step S4, the diameter of the end face of the guide head is 4mm larger than the outer diameter of the first-stage temperature measuring tube so as to reduce the resistance on the tube side.
In step S6, the wires of the temperature monitoring tube are connected with an LTM-8303 temperature measuring module and an LTM-8520 converter.
The beneficial effects of the invention are as follows: the invention adopts the stress monitoring pipe and the temperature monitoring pipe to monitor the three-dimensional stress and the temperature of one point in the frozen wall, can track the changes of the stress and the temperature of the frozen wall after the frozen wall is formed and in the process of excavating in the frozen wall, and achieves the aim of monitoring the safety state of the excavating process; when in construction, the deformation of the stress monitoring pipe is restrained by the lining ring, after the freezing wall is formed, the stress is released by removing the top sealing block of the lining ring, and the stress in the freezing wall is measured; the temperature sensor is closely adjacent to the stress monitoring pipe and measures the temperature of the stress monitoring point.
Drawings
FIG. 1 is a schematic diagram of a first-stage temperature measuring tube according to the present invention;
FIG. 2 is a schematic diagram of a stress monitor tube according to the present invention;
FIG. 3 is a schematic view of a liner ring in a stress monitoring tube according to the present invention;
FIG. 4 is a schematic view of the arrangement of strain gauges in a stress monitoring tube according to the present invention;
FIG. 5 is a schematic view of a temperature monitoring tube according to the present invention;
FIG. 6 is a schematic diagram of a subsequent temperature measurement tube according to the present invention;
in the figure: 1-a guide head; 2-a first-stage temperature measuring tube; 3-stress monitoring tube; 4-a temperature monitoring tube; 5-a subsequent temperature measuring tube;
31-an inner liner ring; 32-an internally threaded metal ring; 33-epoxy overclad; 34-adjacent blocks; 35-a steel wire rope; 36-capping block; a 37-epoxy cylinder; 38-strain relief;
41-a temperature sensor; 42-metal tube; 43-mounting groove; 44-conducting wires;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
a method for monitoring the stress and temperature of a freezing wall in a soft soil stratum is shown in fig. 1 to 6, and comprises the following specific steps:
s1, manufacturing stress monitoring tube 3
The stress monitoring tube 3 comprises an epoxy resin cylinder 37, wherein the two ends of the epoxy resin cylinder 37 are provided with internal thread metal rings 32, an epoxy resin outer cladding 33 is poured outside the internal thread metal rings 32 and the epoxy resin cylinder 37, an inner lining ring 31 is arranged inside the epoxy resin cylinder 37, a circular ring welded on one end face of the inner lining ring 31 is arranged, and a steel wire rope 35 is bound on the circular ring;
the outer diameter of the epoxy cylinder 37 is 106mm and the wall thickness is 7mm; the outer diameter of the internal thread metal ring 32 is 106mm, the wall thickness is 7mm, and the internal thread is arranged on the inner wall; the outer diameter of the epoxy resin outer cladding 33 is 108mm and the wall thickness is 1mm;
the outer diameter of the inner lining ring 31 is 92mm, the wall thickness is 8mm, the length of the inner lining ring 31 is the same as that of the epoxy resin cylinder 37, the inner lining ring 31 is cut into three inner lining ring pieces by a seamless steel pipe, one piece is a capping piece 36, the other two pieces are adjacent pieces 34, the circular ring of the binding steel wire rope 35 is welded at the end part of the capping piece 36, and the two pieces are the capping piece 36 and the two adjacent pieces 34 assembled in the epoxy resin cylinder 37;
three groups of strain gauges 38 are poured on the inner circumference of the side wall of the epoxy resin cylinder 37, the included angles among the three groups of strain gauges 38 are 120 degrees, each group of strain gauges 38 consists of four strain gauges, the four strain gauges are spaced by 45 degrees, and strain monitoring wires of the strain gauges are led out from the side wall of the epoxy resin cylinder 37;
s2, manufacturing a temperature monitoring tube 4
The temperature monitoring tube 4 comprises a metal tube 42, the metal tube 42 is made of a seamless steel tube with the diameter of 108mm and the thickness of 8mm, an inner thread is arranged on the inner wall of one end part of the metal tube 42, an outer thread is arranged on the outer wall of the other end part of the metal tube 42, the outer thread end of the metal tube 42 is connected with an inner thread metal ring 32 of the stress monitoring tube 3, three steel plates are welded on the inner wall of the metal tube 42 at one end close to the stress monitoring tube 3 to form a mounting groove 43, a temperature sensor 41 is packaged in a metal round rod and placed in the mounting groove 43, a digital temperature sensor DS18B20 is adopted for the temperature sensor 41, and a lead 44 of the temperature sensor 41 is led out from a tube orifice of the metal tube 42;
s3, measuring, lofting and perforating the temperature measuring hole
Measuring and determining a hole site center point of the hole site by using a steel tape according to the design distance between the hole site of the freezing hole and the reference cross line, marking the hole site center cross line by using red paint, then perforating the tunnel segment by using a perforating drill, and connecting a control valve after installing the hole site pipe;
s4, jacking the first-section temperature measuring tube 2
The ejector rod is connected with a guide head 1 at the head part of the freezing pipe, one end of the guide head 1 is a conical head, the other end of the guide head 1 is connected with a first-section temperature measuring pipe 2, the diameter of the end face of the guide head 1 is 4mm larger than the outer diameter of the first-section temperature measuring pipe 2 so as to reduce the resistance of the pipe side, a piston of the push bench is connected with the tail end of the ejector rod, a hydraulic pump is started, when the piston of the hydraulic cylinder stretches, the ejector rod is applied with a jacking force, and the jacking force is transmitted to the guide head 1 at the head part of the freezing pipe through the ejector rod and drives the first-section temperature measuring pipe 2 to enter a stratum;
s5, monitoring jacking of pipe section
One end of a temperature monitoring tube 4 is connected with a first-section temperature measuring tube 2, the other end of the temperature monitoring tube is connected with a stress monitoring tube 3, a ruler adding rod is added between a push rod and a top cap of the push bench, and the stress monitoring tube 3 and the temperature monitoring tube 4 are pushed into a soil layer;
s6, continuously jacking
Connecting the other end of the stress monitoring tube 3 with the subsequent temperature measuring tube 5, continuing to extend the push rod of the push bench, pushing the subsequent temperature measuring tube 5, removing the push bench after the push rod reaches the designed depth, pulling out the push rod, leading out the inner lining ring steel wire rope 35, leading out the lead 44 of the temperature monitoring tube 4 to be connected with the LTM-8303 temperature measuring module and the LTM-8520 converter, and then transmitting the lead to a computer, and leading out the strain monitoring lead to be connected with the strain gauge;
s7, monitoring
After the frozen wall is formed, the capping block 36 of the lining ring 31 is pulled out by the steel wire rope 35, the constraint of the lining ring 31 on the epoxy resin cylinder 37 is released, and the stress monitoring and the temperature monitoring are started, so that the further development of the frozen wall and the temperature and the stress development in the excavation process are monitored;
s8, performing temperature calibration on the frozen wall stress monitoring
The strain gauge and the strain monitoring wire in the stress monitoring tube 3 are affected by temperature, the strain monitoring wire with the same length is connected with the stress monitoring tube 3 with the same specification according to the monitored freezing wall temperature, and the strain monitoring wire is placed in a freezer with the same temperature to monitor stress and serve as temperature compensation for monitoring the freezing wall stress.
The invention has the design key points and advantages that:
the invention adopts the stress monitoring tube 3 and the temperature monitoring tube 4 to monitor the three-dimensional stress and the temperature of the freezing wall, solves the problem that only temperature monitoring data can be obtained in the conventional technology at present, and provides possibility for grasping the stress condition of the freezing wall;
when the invention is constructed, the inner lining ring 31 is adopted to restrict the deformation of the stress monitoring pipe 3, after the freezing wall is formed, the stress release is achieved by removing the inner lining ring 31, and the stress in the freezing wall is measured;
in the invention, a temperature sensor 41 is closely adjacent to a stress monitoring pipe 3, and the temperature of a stress monitoring point is measured;
the invention can track the changes of the stress and the temperature of the frozen wall after the frozen wall is formed and during the excavation process in the frozen wall, thereby achieving the purpose of monitoring the safety state during the excavation process.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is intended to cover various modifications, either made by the method concepts and technical solutions of the invention, or applied directly to other applications without modification, within the scope of the invention.
Claims (7)
1. A method for monitoring the stress and the temperature of a freezing wall in a soft soil stratum is characterized by comprising the following specific steps:
s1, manufacturing stress monitoring tube (3)
The stress monitoring tube (3) comprises an epoxy resin cylinder (37), wherein two ends of the epoxy resin cylinder (37) are provided with internal thread metal rings (32), an epoxy resin outer cladding layer (33) is poured outside the internal thread metal rings (32) and the epoxy resin cylinder (37), an inner lining ring (31) is arranged inside the epoxy resin cylinder (37), a circular ring is welded on one end face of the inner lining ring (31), and a steel wire rope (35) is bound on the circular ring;
three groups of strain gauges (38) are cast on the inner circumference of the side wall of the epoxy resin cylinder (37), the included angle between the three groups of strain gauges (38) is 120 degrees, each group of strain gauges (38) consists of four strain gauges, the four strain gauges are mutually spaced by 45 degrees, and strain monitoring wires of the strain gauges are led out from the side wall of the epoxy resin cylinder (37);
s2, manufacturing temperature monitoring tube (4)
The temperature monitoring tube (4) comprises a metal tube (42), wherein an inner thread is arranged on the inner wall of one end part of the metal tube (42), an outer thread is arranged on the outer wall of the other end part of the metal tube (42), the outer thread end of the metal tube (42) is connected with an inner thread metal ring (32) of the stress monitoring tube (3), three steel plates are welded on the inner wall of the metal tube (42) at one end close to the stress monitoring tube (3) to form a mounting groove (43), a temperature sensor (41) is packaged in a metal round rod and is placed in the mounting groove (43), and a lead (44) of the temperature sensor (41) is led out from the mouth of the metal tube (42);
s3, measuring, lofting and perforating the temperature measuring hole
Measuring and determining a hole site center point of the hole site by using a steel tape according to the design distance between the hole site of the freezing hole and the reference cross line, marking the hole site center cross line by using red paint, then perforating the tunnel segment by using a perforating drill, and connecting a control valve after installing the hole site pipe;
s4, jacking the first-section temperature measuring tube (2)
The ejector rod is connected with a guide head (1) at the head of the freezing pipe, one end of the guide head (1) is a conical head, the other end of the guide head is connected with a first-section temperature measuring pipe (2), a piston of the push bench is connected with the tail end of the ejector rod, a hydraulic pump is started, when the piston of the hydraulic cylinder stretches, a pushing force is applied to the ejector rod, and the pushing force is transmitted to the guide head (1) at the head of the freezing pipe through the ejector rod and drives the first-section temperature measuring pipe (2) to enter a stratum;
s5, monitoring jacking of pipe section
One end of a temperature monitoring tube (4) is connected with a first-section temperature measuring tube (2), the other end of the temperature monitoring tube is connected with a stress monitoring tube (3), a ruler adding rod is added between a push rod and a top cap of the push bench, and the stress monitoring tube (3) and the temperature monitoring tube (4) are pushed into a soil layer;
s6, continuously jacking
Connecting the other end of the stress monitoring tube (3) with a subsequent temperature measuring tube (5), continuing to extend a push rod of the push bench, pushing the subsequent temperature measuring tube (5), removing the push bench after the push rod reaches a designed depth, pulling out the push rod, leading out a liner ring steel wire rope (35), leading out a wire (44) of the temperature monitoring tube (4) to be connected with a temperature measuring module and a converter, transmitting the wire to a computer, and leading out the strain monitoring wire to be connected with a strain gauge;
s7, monitoring
After the frozen wall is formed, the local structure of the inner lining ring (31) is pulled out by a steel wire rope (35), the constraint of the inner lining ring (31) on the epoxy resin cylinder (37) is released, and the stress monitoring and the temperature monitoring are started, so that the further development of the frozen wall and the temperature and the stress development in the excavation process are monitored;
s8, performing temperature calibration on the frozen wall stress monitoring
The strain gauge and the strain monitoring wire in the stress monitoring tube (3) are affected by temperature, the strain monitoring tube (3) with the same specification is connected with the strain monitoring wire with the same length according to the monitored freezing wall temperature, and the strain monitoring tube is placed in a refrigerator with the same temperature to monitor the stress and serve as temperature compensation for monitoring the freezing wall stress.
2. A method of monitoring freeze wall stress and temperature in a soft soil formation according to claim 1, wherein in step S1, the outer diameter of the epoxy resin cylinder (37) is 106mm and the wall thickness is 7mm; the outer diameter of the internal thread metal ring (32) is 106mm, the wall thickness is 7mm, and the inner wall is provided with internal threads; the outer diameter of the epoxy resin outer cladding (33) was 108mm and the wall thickness was 1mm.
3. The method for monitoring the stress and the temperature of the freezing wall in the soft soil stratum according to claim 2, wherein in the step S1, the outer diameter of the inner lining ring (31) is 92mm, the wall thickness is 8mm, the length of the inner lining ring (31) is the same as the length of the epoxy resin cylinder (37), the inner lining ring (31) is cut into three inner lining ring pieces by a seamless steel pipe, one inner lining ring piece is a top sealing block (36) and the other two inner lining ring pieces are adjacent blocks (34), the ring of the steel wire rope (35) is welded at the end part of the top sealing block (36), and one inner lining ring piece (36) and the two inner lining ring pieces are adjacent blocks (34) and are assembled inside the epoxy resin cylinder (37).
4. A method for monitoring the stress and temperature of a freeze wall in a soft soil layer according to claim 3, wherein in step S2, the metal tube (42) is made of a seamless steel tube having a diameter of 108mm and a thickness of 8 mm.
5. A method for monitoring the stress and temperature of a freeze wall in a soft soil layer according to claim 4, wherein in step S2, the temperature sensor (41) is a digital temperature sensor DS18B20.
6. A method for monitoring the stress and temperature of a freeze wall in a soft soil layer according to claim 5, wherein in step S4, the end face diameter of the guide head (1) is 4mm larger than the outer diameter of the first-stage temperature measuring tube (2) so as to reduce the tube side resistance.
7. A method for monitoring the stress and temperature of a freeze wall in a soft soil layer according to claim 6, wherein in step S6, the wires (44) of the temperature monitoring tube (4) are connected to an LTM-8303 temperature measuring module and an LTM-8520 converter.
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| CN101387500A (en) * | 2008-10-24 | 2009-03-18 | 石家庄铁道学院 | Optical fiber grating temperature self-compensating strain transducer based on thermal stress mechanism |
| CN101694432A (en) * | 2009-10-21 | 2010-04-14 | 中国科学院力学研究所 | Method for evaluating reliability of thermal barrier coating system and device thereof |
| CN101929220A (en) * | 2010-06-29 | 2010-12-29 | 金文成 | Intelligent composite spiral reinforcement stirrup and manufacturing method and building composite anchoring head thereof |
| CN103115935A (en) * | 2013-01-25 | 2013-05-22 | 安徽理工大学 | Method for monitoring thawing process of frozen wall through optical fiber temperature sensing |
| CN103698222A (en) * | 2014-01-20 | 2014-04-02 | 哈尔滨工程大学 | Boiler wall temperature and stress measurement device and boiler fatigue life measurement method |
| CN109974792A (en) * | 2019-03-22 | 2019-07-05 | 西安石油大学 | Pipeline nondestructive stress measurement detection pilot system and method based on magnetic coupling effect |
| CN113898412A (en) * | 2021-10-13 | 2022-01-07 | 中铁十九局集团有限公司 | Freeze-induced expansion force monitoring method based on subway horizontal freezing |
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