CN114486028A - Multi-data-based real-time monitoring and regulating method for jacking force of jacking pipe - Google Patents
Multi-data-based real-time monitoring and regulating method for jacking force of jacking pipe Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 35
- 239000002689 soil Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 3
- 239000013307 optical fiber Substances 0.000 claims description 40
- 238000004891 communication Methods 0.000 claims description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 12
- 238000002347 injection Methods 0.000 abstract 1
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- 230000002787 reinforcement Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/12—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving photoelectric means
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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
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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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
- E21D9/005—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by forcing prefabricated elements through the ground, e.g. by pushing lining from an access pit
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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
- E21D9/10—Making by using boring or cutting machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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Abstract
The invention relates to a multi-data-based real-time monitoring and regulating method for jacking force, which is particularly suitable for jacking force monitoring in jacking pipe engineering and belongs to the field of trenchless underground building engineering. The invention predicts the total jacking force of the pipe joint by acquiring the data of the water and soil pressure reinforced concrete pipe joint axial stress, the steel pipe joint axial strain and the circumferential strain, the jacking distance and the actual jacking force in front of the machine head, compares the predicted total jacking force with the actual jacking force provided by the current jacking oil cylinder, and sends out a corresponding instruction according to the comparison result to regulate and control the oil pressure of the jacking oil cylinder and the slurry injection amount of the jacking pipe so as to achieve the aim of matching the actual jacking force with the total jacking force. The method and the device can predict the jacking force according to the collected data, change the actual jacking force according to the predicted jacking force, reduce the construction risk and prolong the service life of construction facilities.
Description
Technical Field
The invention relates to a multi-data-based real-time monitoring and regulating method for jacking force, which is particularly suitable for jacking force monitoring in jacking pipe engineering and belongs to the field of trenchless underground building engineering.
Background
The pipe jacking technology is one of trenchless technologies, and has little influence on the surrounding environment and buildings during construction. The jacking force is an important parameter of pipe jacking engineering design and construction, the value of the jacking force is closely related to soil layer parameters, pipe diameter, pipeline burial depth, jacking length, lubrication resistance reduction and the like, the jacking force is an important reference index in the aspect of engineering construction preparation design such as the thickness of a back wall, the number of jacking oil cylinders, relay interval arrangement and the like, and the overlarge and undersize jacking force values are directly related to engineering construction cost and construction progress.
The jacking force mainly comprises head-on resistance and pipe circumference friction resistance, forward pressure is provided by a jacking oil cylinder at present, the jacking friction resistance is reduced by grouting to meet the jacking force requirement of a jacking pipe, and in actual engineering, as an operator tends to apply larger oil cylinder pressure, the jacking force of the jacking pipe is larger and far exceeds the minimum jacking force required by jacking of the jacking pipe; the phenomenon of large pressure of the oil cylinder is most obvious in the pipe jacking-stop cycle construction process, different from the jacking smooth stage with relatively small jacking force, the re-jacking starts to generally apply large pressure of the oil cylinder, but in the actual engineering, the jacking of the smooth stage is still generally carried out by the pressure of the oil cylinder during the re-jacking; in each jacking stage, stratum conditions are different, but grouting in engineering cannot be adjusted according to the actual jacking stage, so that a large amount of mud is wasted; although the jacking pipe can be jacked forwards by the aid of excessive oil cylinder pressure, the jacking oil cylinder is also excessively worn by the excessive oil cylinder pressure, higher requirements are also placed on the strength of a working wall and a pipe joint of the opening, and construction cost and construction risk can be reduced by the aid of proper oil cylinder pressure or jacking force.
Disclosure of Invention
The invention aims to solve the problems and provides a multi-data-based real-time monitoring and regulating method for jacking force, which can predict jacking force according to collected data, change actual jacking force according to predicted jacking force, reduce construction risk and prolong the service life of construction facilities.
In order to achieve the aim, the invention provides a real-time monitoring and regulating method for jacking force based on multivariate data, which comprises the following specific steps:
(1) the method comprises the steps of collecting water and soil pressure in front of a machine head, namely the head-on water and soil pressure P in real time, and transmitting the numerical value of the head-on water and soil pressure P to a computer for collecting and processing data through a data collection module;
(2) starting from a first pipe joint of a jacking pipe, j stress monitoring points are arranged along the axial direction of the jacking pipe, j is more than or equal to 2 and less than or equal to n, when the pipe joint of the jacking pipe is a reinforced concrete pipe joint, reinforcing steel bar stressometers are respectively arranged at the upper, lower, left and right positions of the ring section of the reinforced concrete pipe joint corresponding to each stress monitoring point, and the axial stress of the pipe joint is measured by each reinforcing steel bar stressometer to obtain the axial stress sigma of the corresponding reinforced concrete pipe jointjsS is more than or equal to 1 and less than or equal to 4; when the pipe joint of the jacking pipe is a steel pipe joint, axial stress-strain optical fibers A are respectively arranged at each stress monitoring point along the axial upper, lower, left and right positions of the steel pipe joint, a circumferential stress-strain optical fiber B perpendicular to the axial stress-strain optical fibers A is arranged on the ring section of the corresponding steel pipe joint, and the axial strain of the steel pipe joint is measured through the stress-strain optical fibers A to obtain the corresponding axial strain epsilonjxkK is more than or equal to 1 and less than or equal to 4; the stress-strain optical fiber B is used for measuring the circumferential strain of the steel pipe joint to obtain the corresponding circumferential strain epsilonjy(ii) a Axial stress sigma of reinforced concrete pipe joint through data acquisition modulejsAxial strain epsilon of steel pipe jointjxkAnd hoop strain epsilonjyTransmitting the data to a computer;
(3) the jacking distance L of the jacking pipe is monitored in real time, and the real-time oil pressure of the jacking oil cylinder is monitored to obtain the actual jacking force F of the jacking oil cylinderdThe jacking distance L and the actual jacking force F obtained by monitoring are acquired through the data acquisition moduledThe numerical value of (2) is transmitted to a computer;
(4) the computer calculates according to the data value collected by the data acquisition module, and when the pipe joint where the stress monitoring point is located is the reinforced concrete pipe joint, the average value of the axial stress of the pipe joint measured by the reinforced strain gauge on the annular section of the reinforced concrete pipe joint is calculated according to the formula 1
And (3) calculating:
in the formula:
axial strain average, sigma, of pipe joints measured by strain gauges corresponding to the reinforced concrete pipe jointsjsThe axial stress of the corresponding reinforced concrete pipe joint is measured by the steel bar strain gauge;
the axial pressure N of the pipe joint of the reinforced concrete pipe joint corresponding to the stress monitoring point is calculated by the formula 2jAnd (3) calculating:
in the formula:
the average axial strain value of the pipe joint measured by a steel strain gauge on the section of the reinforced concrete pipe joint ring, AcIs the cross-sectional area of the concrete, AsIs the total cross-sectional area of the reinforcing bar, EcIs the modulus of elasticity of concrete, EsIs the modulus of elasticity of the steel bar;
when the pipe joint where the stress monitoring point is located is a steel pipe joint, the axial strain epsilon of the steel pipe joint is determined according to the formula 3jxkAnd hoop strain epsilonjyConversion into axial stress sigma of steel pipe jointjxk：
In the formula: e is the elastic modulus of the steel pipe joint, v is the Poisson's ratio of the steel pipe material, epsilonjxkFor axial strain of the steel pipe joint, epsilonjyThe circumferential strain of the steel pipe section is obtained;
by the formula4 average value of axial stress of the steel top pipe joint
And (3) calculating:
the formula 5 is used for measuring the axial pressure N of the pipe joint of the steel jacking pipe corresponding to the stress monitoring pointjAnd (3) calculating:
in the formula: a is the section area of the steel pipe section;
(5) average value of frictional resistance per unit length by computer through formula 6
And (3) calculating:
in the formula: delta NjFor axial pressure difference of pipe joints between two adjacent stress monitoring points,/jThe distance length between two adjacent stress monitoring points is obtained;
by the average value of the water-soil pressure P and the frictional resistance per unit length
Predicting total jacking force F by a prediction model formed by the jacking distance L, wherein the prediction model of the total jacking force F is the sum of the internal force of the first section of pipe and the total frictional resistance of all subsequent pipe sections, and the internal force of the first section of pipe is formed by the head-on resistance, namely the head-on water and soil pressure P, and the actually measured frictional resistance N of the pipe1The total frictional resistance of the jacked pipe joint is measured according to the jacking distance L and the frictional resistance per unit length
And (3) obtaining k which is more than or equal to 1 and less than or equal to n through cumulative coupling, and calculating the total jacking force F through a formula 7:
in the formula: f is total jacking force, P is water-soil pressure on the head side, and N1Actually measuring frictional resistance for the first pipe joint;
(6) the computer compares the predicted total jacking force F with the actual jacking force F provided by the current jacking oil cylinderdComparing, and sending out corresponding instruction according to the comparison result to regulate and control the oil pressure of the jacking oil cylinder and the mud grouting amount of the jacking pipe so as to achieve the actual jacking force FdThe purpose of matching with the total jacking force F.
Further, in step (6), when the predicted total jacking force F is larger than the actual jacking force F provided by the current jacking oil cylinderdWhen the jacking pipe is pushed to the position, the computer sends out an instruction, the jacking force of the jacking oil cylinder is increased by improving the oil pressure of the jacking oil cylinder, and the grouting amount is increased at the section to reduce the pipe-periphery friction force of the jacking pipe; when the predicted total jacking force F is smaller than the actual jacking force F provided by the current jacking oil cylinderdWhen the oil pressure of the jacking oil cylinder is reduced or maintained, the computer sends out an instruction.
The device at least comprises a pipe jacking head, a pipe jacking positioned behind the pipe jacking head, a jacking oil cylinder jacked at the wall of an originating well, a grouting device for lubricating, reducing drag and supporting soil, a roller type meter for measuring jacking distance, a data acquisition module for transmitting data and a computer for storing, calculating and sending instructions, and is characterized in that: the pipe jacking machine head at least comprises a head-on cutter head and soil and water pressure sensors which are uniformly arranged on a rear panel of a mud pit behind the head-on cutter head, the pipe jacking at least comprises a first section pipe with a stress monitoring point and monitoring sections with the stress monitoring point, each monitoring section at least comprises a monitoring pipe joint and a common pipe joint clamped by the monitoring pipe joint at a certain distance, the monitoring pipe joint is internally provided with the stress monitoring point, a jacking oil cylinder is positioned at the tail part of the pipe jacking and provides forward jacking force for the pipe jacking, the grouting device performs grouting to the outer ring gap of the pipe joint through a grouting hole in the pipe jacking, the roller type meter gauge is positioned at the position of an initial well opening and is in contact with the pipe joint at the opening, and the soil pressure sensor, the stress monitoring point and the roller type meter gauge are all in communication connection with a computer through a data acquisition module in a wired or wireless mode, and the computer is in communication connection with the slurry circulation system and the jacking oil cylinder.
M monitoring sections consisting of front and rear monitoring pipe sections with p common pipe sections at intervals are arranged behind the first section of pipe, p is more than or equal to 0, and each monitoring section is continuously arranged until the position of an originating well opening so that the jacking oil cylinder is in contact with the monitoring section.
The reinforced concrete pipe jacking monitoring pipe joint is characterized in that a steel bar strain gauge for monitoring axial stress is connected in parallel on a main reinforcement in a binding and welding mode, two mounting rods are connected to two sides of the main reinforcement in a welding mode, a steel bar meter is mounted in the middle of the mounting rods and is in communication connection with a computer through a data transmission module.
The steel ejector pipe monitoring pipe joint comprises surface strain optical fibers A used for monitoring axial stress and surface strain optical fibers B used for monitoring hoop stress, the axial stress strain optical fibers A are distributed at the upper, lower, left and right positions of the monitoring pipe joint, the hoop stress strain optical fibers B are arranged along the ring section of the pipe joint and are perpendicular to the axial stress strain optical fibers A, and the optical fibers are in communication connection with a computer through a data transmission module.
The jacking pipe jacking force real-time monitoring and regulating method based on multivariate data obtains the predicted jacking force of the jacking pipe by comprehensively calculating the acquisition of pipe joint stress information and the acquisition of other auxiliary information in the jacking process of the jacking pipe, analyzes the collected information and calculates the predicted jacking force of the jacking pipe.
Drawings
FIG. 1 is a schematic diagram of a real-time monitoring and regulating method for jacking force of a jacking pipe
FIG. 2 is a schematic view of a pipe jacking machine head and a first pipe
FIG. 3 is a schematic diagram of a reinforced concrete pipe section steel bar stress gauge
FIG. 4 is a schematic diagram of a steel pipe section strain optical fiber arrangement
FIG. 5 is a schematic view of a real-time monitoring and controlling device for jacking force of a jacking pipe
In the figure: 1. a pipe jacking machine head; 2. a first section pipe; 3. a head-on cutter; 4. a muddy water compartment; 5. a soil pressure sensor; 6. grouting holes; 7. a steel bar stress meter; 8. a main rib; 9. mounting a rod; 10. a surface-strained optical fiber; 11. an axially strained optical fiber A; 12. a hoop strain optical fiber B; 13. the inner side surface of the jacking pipe; 14. a grouting device; 15. a roller type meter counter; 16. jacking the oil cylinder; 17. a monitoring section; 18. monitoring the pipe joints; 19. a common pipe section; 20. and (4) a computer.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and specific embodiments; the scope of the invention is not limited to the examples described below.
The invention provides a multi-data-based real-time monitoring and regulating method for jacking force of jacking pipe, which is implemented according to the following specific steps as shown in figure 1:
(1) the method comprises the following steps of acquiring water and soil pressure in front of a pipe jacking machine head 1, namely the head-on water and soil pressure P in real time, and transmitting the numerical value of the head-on water and soil pressure P to a computer 20 for acquiring and processing data through a data acquisition module;
(2) starting from a first section of pipe 2 of the jacking pipe, j stress monitoring points are arranged along the axial direction of the jacking pipe, j is more than or equal to 2 and less than or equal to n, when the jacking pipe joint is a reinforced concrete pipe joint, reinforcing steel bar stress meters 7 are respectively arranged at the upper, lower, left and right positions of the section of the reinforced concrete pipe joint ring corresponding to each stress monitoring point, and the axial stress sigma of the corresponding reinforced concrete pipe joint is obtained by measuring the axial stress of the pipe joint through each reinforcing steel bar stress meter 7jsS is more than or equal to 1 and less than or equal to 4; when the pipe joints of the jacking pipes are steel pipe joints, each pipe joint is a steel pipe jointAxial strain optical fibers A11 are respectively arranged at the stress monitoring points along the axial upper, lower, left and right positions of the steel pipe joint, an annular strain optical fiber B12 which is perpendicular to the axial strain optical fiber A11 is arranged on the annular section of the corresponding steel pipe joint, and the axial strain of the steel pipe joint is measured through the axial strain optical fiber A11 to obtain the corresponding axial strain epsilonjxkK is more than or equal to 1 and less than or equal to 4; the corresponding hoop strain epsilon is obtained by measuring the hoop strain of the steel pipe section through the hoop strain optical fiber B12jy(ii) a Axial stress sigma of reinforced concrete pipe joint through data acquisition modulejsAxial strain epsilon of steel pipe jointjxkAnd hoop strain epsilonjyData transmission to the computer 20;
(3) the jacking distance L of the jacking pipe is monitored in real time, and the real-time oil pressure of the jacking oil cylinder 16 is monitored to obtain the actual jacking force F of the jacking oil cylinder 16dThe jacking distance L and the actual jacking force F obtained by monitoring are acquired through the data acquisition moduledThe value of (2) is transmitted to the computer 20;
(4) the computer 20 calculates according to the data value collected by the data acquisition module, and when the pipe joint where the stress monitoring point is located is the reinforced concrete pipe joint, the average value of the axial stress of the pipe joint measured by the reinforced strain gauge on the annular section of the reinforced concrete pipe joint is calculated according to the formula 1
And (3) calculating:
in the formula:
axial strain average, sigma, of pipe joints measured by strain gauges corresponding to the reinforced concrete pipe jointsjsThe axial stress of the corresponding reinforced concrete pipe joint is measured by the steel bar strain gauge;
the axial pressure N of the pipe joint of the reinforced concrete pipe joint corresponding to the stress monitoring point is calculated by the formula 2jAnd (3) calculating:
in the formula:
the average axial strain value of the pipe joint measured by a steel strain gauge on the section of the reinforced concrete pipe joint ring, AcIs the cross-sectional area of the concrete, AsIs the total cross-sectional area of the reinforcing bar, EcIs the modulus of elasticity of concrete, EsIs the modulus of elasticity of the steel bar;
when the pipe joint where the stress monitoring point is located is a steel pipe joint, the axial strain epsilon of the steel pipe joint is determined according to the formula 3jxkAnd hoop strain epsilonjyConversion into axial stress sigma of steel pipe jointjxk：
In the formula: e is the elastic modulus of the steel pipe joint, v is the Poisson's ratio of the steel pipe material, epsilonjxkFor axial strain of the steel pipe joint, epsilonjyThe circumferential strain of the steel pipe section is obtained;
average value of axial stress of the steel top pipe joint through formula 4
And (3) calculating:
the formula 5 is used for measuring the axial pressure N of the pipe joint of the steel jacking pipe corresponding to the stress monitoring pointjAnd (3) calculating:
in the formula: a is the section area of the steel pipe section;
(5) the computer 20 averages the frictional resistance per unit length by the formula 6
And (3) calculating:
in the formula: delta NjFor axial pressure difference of pipe joints between two adjacent stress monitoring points,/jThe distance length between two adjacent stress monitoring points is obtained;
by the average value of the water-soil pressure P and the frictional resistance per unit length
Predicting total jacking force F by a prediction model formed by the jacking distance L, wherein the prediction model of the total jacking force F is the sum of the internal force of the first section of pipe and the total frictional resistance of all subsequent pipe sections, and the internal force of the first section of pipe is formed by the head-on resistance, namely the head-on water and soil pressure P, and the actually measured frictional resistance N of the pipe1The total frictional resistance of the jacked pipe joint is measured according to the jacking distance L and the frictional resistance per unit length
And (3) obtaining k which is more than or equal to 1 and less than or equal to n through cumulative coupling, and calculating the total jacking force F through a formula 7:
in the formula: f is total jacking force, P is water-soil pressure on the head side, and N1Actually measuring frictional resistance for the first pipe joint;
(6) the computer 20 compares the predicted total jacking force F with the actual jacking force F provided by the current jacking cylinder 16dComparing the values and giving out corresponding instructions according to the comparison result to regulate and control the oil pressure of the jacking oil cylinder 16 and the mud grouting amount of the jacking pipe so as to achieve the actual jacking force FdMatching the total jacking force FThe purpose of (1). When the predicted total jacking force F is larger than the actual jacking force F provided by the current jacking oil cylinder 16dWhen the hydraulic pressure of the jacking cylinder 16 is increased, the computer 20 sends out an instruction to increase the jacking force of the jacking cylinder 16 and increase the grouting amount at the section so as to reduce the pipe-periphery friction force of the jacking pipe; when the predicted total jacking force F is smaller than the actual jacking force F provided by the current jacking oil cylinderdAt this time, the computer 20 issues a command to reduce or maintain the oil pressure of the jack cylinder 16.
The invention also provides a device suitable for the multi-data-based real-time monitoring and regulating method of jacking pipe jacking force, which at least comprises a jacking pipe head 1, a jacking pipe positioned behind the jacking pipe head 1, a jacking oil cylinder 16 jacked at the wall of an originating well, a grouting device 14 for lubricating, reducing drag and supporting soil, a roller type meter counter 15 for measuring jacking distance, a data acquisition module for transmitting data and a computer 20 for storing, calculating and sending instructions, as shown in figure 5.
As shown in fig. 2, the pipe jacking machine head 1 at least comprises a head-on cutter head 3 and soil pressure sensors 5 uniformly arranged on a rear panel of a mud tank 4 behind the head-on cutter head 3, the pipe jacking at least comprises a first section of pipe 2 with a stress monitoring point and monitoring sections 17 with the stress monitoring points, each monitoring section 17 at least comprises monitoring pipe sections 18 at certain intervals and common pipe sections 19 wrapped and clamped by the monitored pipe sections 18, wherein the monitoring pipe sections 18 are internally provided with the stress monitoring points, a jacking oil cylinder 16 is positioned at the tail part of the pipe jacking to provide forward jacking force for the pipe jacking, a grouting device 14 conducts grouting to the outer ring gap of the pipe sections through grouting holes 6 on the pipe jacking pipe, the roller type meter-counting instrument 15 is positioned at the position of an originating hole and is in contact with the pipe sections at the hole, the soil pressure sensors 5, the stress monitoring points and the roller type meter-counting instrument 15 are all in communication connection with a computer 20 through a data acquisition module in a wired or wireless manner, computer 20 is in communication with grouting device 14 and ram cylinder 16.
As shown in fig. 3, be equipped with the main muscle 8 on the reinforced concrete push pipe monitoring pipe section, in order not to destroy the mechanical properties of original pipe section, the reinforcing bar stressometer 7 for monitoring axial stress adopts the tie-up welding mode to connect in parallel on main muscle 8, and two installation poles 9 pass through the welding mode and connect in the both sides of main muscle 8, and reinforcing bar stressometer 7 is installed in installation pole 9 middle part position, and reinforcing bar stressometer 7 passes through data transmission module and is connected with the communication of computer 20.
As shown in fig. 4, the steel ejector pipe monitoring pipe joint is provided with the surface strain optical fiber 10 for monitoring, which includes an axial strain optical fiber a11 for monitoring axial strain and a hoop strain optical fiber B12 for monitoring hoop strain, the axial strain optical fiber a11 is distributed at the upper, lower, left and right positions of the monitoring pipe joint, the hoop strain optical fiber B12 is arranged along the ring section of the pipe joint, and is perpendicular to the axial strain optical fiber a11, so as to achieve good coupling with the steel pipe, the axial strain optical fiber a11 and the hoop strain optical fiber B12 are both adhered to the inner side surface 13 of the ejector pipe through epoxy resin, and are in communication connection with the computer 20 through a data transmission module.
Claims (6)
1. A multi-data-based real-time monitoring and regulating method for jacking force is characterized by comprising the following specific steps:
(1) the method comprises the steps of collecting water and soil pressure in front of a machine head, namely the head-on water and soil pressure P in real time, and transmitting the numerical value of the head-on water and soil pressure P to a computer for collecting and processing data through a data collection module;
(2) starting from a first pipe joint of a jacking pipe, j stress monitoring points are arranged along the axial direction of the jacking pipe, j is more than or equal to 2 and less than or equal to n, when the pipe joint of the jacking pipe is a reinforced concrete pipe joint, reinforcing steel bar stressometers are respectively arranged at the upper, lower, left and right positions of the ring section of the reinforced concrete pipe joint corresponding to each stress monitoring point, and the axial stress of the pipe joint is measured by each reinforcing steel bar stressometer to obtain the axial stress sigma of the corresponding reinforced concrete pipe jointjsS is more than or equal to 1 and less than or equal to 4; when the pipe joint of the jacking pipe is a steel pipe joint, axial stress strain optical fibers A are respectively arranged at the upper, lower, left and right positions of each stress monitoring point along the axial direction of the steel pipe joint, and one axial stress strain optical fiber A is arranged at the ring section of the corresponding steel pipe jointThe stress-strain optical fibers A are mutually vertical to the circumferential stress-strain optical fibers B, and the stress-strain optical fibers A are used for measuring the axial strain of the steel pipe joint to obtain the corresponding axial strain epsilonjxkK is more than or equal to 1 and less than or equal to 4; the stress-strain optical fiber B is used for measuring the circumferential strain of the steel pipe joint to obtain the corresponding circumferential strain epsilonjy(ii) a Axial stress sigma of reinforced concrete pipe joint through data acquisition modulejsAxial strain epsilon of steel pipe jointjxkAnd hoop strain epsilonjyTransmitting the data to a computer;
(3) the jacking distance L of the jacking pipe is monitored in real time, and the real-time oil pressure of the jacking oil cylinder is monitored to obtain the actual jacking force F of the jacking oil cylinderdThe jacking distance L and the actual jacking force F obtained by monitoring are acquired through the data acquisition moduledThe numerical value of (2) is transmitted to a computer;
(4) the computer calculates according to the data value collected by the data acquisition module, and when the pipe joint where the stress monitoring point is located is the reinforced concrete pipe joint, the average value of the axial stress of the pipe joint measured by the reinforced strain gauge on the annular section of the reinforced concrete pipe joint is calculated according to the formula 1
And (3) calculating:
in the formula:
axial strain average, sigma, of pipe joints measured by strain gauges corresponding to the reinforced concrete pipe jointsjsThe axial stress of the corresponding reinforced concrete pipe joint is measured by the steel bar strain gauge;
the axial pressure N of the pipe joint of the reinforced concrete pipe joint corresponding to the stress monitoring point is calculated by the formula 2jAnd (3) calculating:
in the formula:
the average axial strain value of the pipe joint measured by a steel strain gauge on the section of the reinforced concrete pipe joint ring, AcIs the cross-sectional area of the concrete, AsIs the total cross-sectional area of the reinforcing bar, EcIs the modulus of elasticity of concrete, EsIs the modulus of elasticity of the steel bar;
when the pipe joint where the stress monitoring point is located is a steel pipe joint, the axial strain epsilon of the steel pipe joint is determined according to the formula 3jxkAnd hoop strain epsilonjyConversion into axial stress sigma of steel pipe jointjxk：
In the formula: e is the elastic modulus of the steel pipe joint, v is the Poisson's ratio of the steel pipe material, epsilonjxkFor axial strain of the steel pipe joint, epsilonjyThe circumferential strain of the steel pipe section is obtained;
average value of axial stress of the steel top pipe joint through formula 4
And (3) calculating:
the formula 5 is used for measuring the axial pressure N of the pipe joint of the steel jacking pipe corresponding to the stress monitoring pointjAnd (3) calculating:
in the formula: a is the section area of the steel pipe section;
(5) computer pass throughFormula 6 average value of frictional resistance per unit length
And (3) calculating:
in the formula: delta NjFor axial pressure difference of pipe joints between two adjacent stress monitoring points,/jThe distance length between two adjacent stress monitoring points is measured;
by the average value of the water-soil pressure P and the frictional resistance per unit length
Predicting total jacking force F by a prediction model formed by the jacking distance L, wherein the prediction model of the total jacking force F is the sum of the internal force of the first section of pipe and the total frictional resistance of all subsequent pipe sections, and the internal force of the first section of pipe is formed by the head-on resistance, namely the head-on water and soil pressure P, and the actually measured frictional resistance N of the pipe1The total frictional resistance of the jacked pipe joint is measured according to the jacking distance L and the frictional resistance per unit length
And (3) obtaining k which is more than or equal to 1 and less than or equal to n through cumulative coupling, and calculating the total jacking force F through a formula 7:
in the formula: f is total jacking force, P is water-soil pressure on the head side, and N1Actually measuring frictional resistance for the first pipe joint;
(6) the computer compares the predicted total jacking force F with the actual jacking force F provided by the current jacking oil cylinderdComparing, and sending out corresponding instruction according to the comparison result to regulate and control the oil pressure of the jacking oil cylinder and the mud grouting amount of the jacking pipe so as to achieve the actual jacking force FdAnd total jackingThe purpose of the force F matching.
2. The jacking pipe jacking force real-time monitoring and regulating method based on multivariate data as claimed in claim 1, which is characterized in that: in step (6), when the predicted total jacking force F is larger than the actual jacking force F provided by the current jacking oil cylinderdWhen the jacking pipe is pushed to the position, the computer sends out an instruction, the jacking force of the jacking oil cylinder is increased by improving the oil pressure of the jacking oil cylinder, and the grouting amount is increased at the section to reduce the pipe-periphery friction force of the jacking pipe; when the predicted total jacking force F is smaller than the actual jacking force F provided by the current jacking oil cylinderdWhen the oil pressure of the jacking oil cylinder is reduced or maintained, the computer sends out an instruction.
3. A device for the real-time monitoring and regulating method of jacking force based on multivariate data of claim 1, at least comprising a jacking head, a jacking pipe behind the jacking head, a jacking oil cylinder jacked at the wall of an originating well, a grouting device for lubricating, reducing drag and supporting soil, a roller type meter for measuring jacking distance, a data acquisition module for transmitting data and a computer for storing, calculating and sending instructions, and is characterized in that: the pipe jacking machine head at least comprises a head-on cutter head and soil and water pressure sensors uniformly arranged on a rear panel of a mud-water cabin behind the head-on cutter head, the pipe jacking at least comprises a first section pipe with a stress monitoring point and monitoring sections with the stress monitoring point, each monitoring section at least comprises a monitoring pipe section and a common pipe section, the monitoring pipe sections are spaced at a certain distance, the common pipe sections are clamped by the monitoring pipe sections, the stress monitoring point is arranged in each monitoring pipe section, a jacking oil cylinder is positioned at the tail part of the pipe jacking and provides forward jacking force for the pipe jacking, the grouting device performs grouting to the outer ring gap of each pipe section through a grouting hole in the pipe jacking pipe, the roller type meter is positioned at the position of an originating well opening and is in contact with the pipe section at the opening, and the soil pressure sensors, the stress monitoring points and the roller type meter are all in communication connection with a computer through a data acquisition module in a wired or wireless mode, and the computer is in communication connection with the slurry circulation system and the jacking oil cylinder.
4. The device for real-time monitoring and regulating and controlling jacking force of jacking pipes based on multivariate data as claimed in claim 3, wherein: m monitoring sections consisting of front and rear monitoring pipe sections with p common pipe sections at intervals are arranged behind the first section of pipe, p is more than or equal to 0, and each monitoring section is continuously arranged until the position of an originating well opening so that the jacking oil cylinder is in contact with the monitoring section.
5. The device for the real-time monitoring and regulating and controlling of jacking force based on multivariate data as claimed in claim 3, wherein: the reinforced concrete jacking pipe is provided with a main rib, the reinforcing steel strain gauges used for monitoring axial stress on the monitoring pipe joints are connected in parallel on the main rib in a binding and welding mode, the two mounting rods are connected to the two sides of the main rib in a welding mode, the reinforcing steel meter is mounted in the middle of the mounting rods and is in communication connection with a computer through the data transmission module.
6. The device for real-time monitoring and regulating and controlling jacking force of jacking pipes based on multivariate data as claimed in claim 3, wherein: the steel ejector pipe monitoring pipe joint comprises surface strain optical fibers A used for monitoring axial stress and surface strain optical fibers B used for monitoring hoop stress, the axial stress strain optical fibers A are distributed at the upper, lower, left and right positions of the monitoring pipe joint, the hoop stress strain optical fibers B are arranged along the ring section of the pipe joint and are perpendicular to the axial stress strain optical fibers A, and the optical fibers are in communication connection with a computer through a data transmission module.
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