CN116718522A - Test device for measuring circumferential stress of pipe jacking pipe and use method - Google Patents
Test device for measuring circumferential stress of pipe jacking pipe and use method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002689 soil Substances 0.000 claims abstract description 173
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000002002 slurry Substances 0.000 claims abstract description 43
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 239000003673 groundwater Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 238000009933 burial Methods 0.000 claims description 4
- 230000000704 physical effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000007569 slipcasting Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- BULVZWIRKLYCBC-UHFFFAOYSA-N phorate Chemical compound CCOP(=S)(OCC)SCSCC BULVZWIRKLYCBC-UHFFFAOYSA-N 0.000 description 1
- -1 silt Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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Abstract
The invention relates to the technical field of pipe jacking engineering, in particular to a test device for measuring the circumferential stress of a pipe jacking pipe and a use method thereof. A test device for measuring the circumferential stress of a push pipe, comprising: the test soil box is used for accommodating test soil; the test pipeline comprises an outer pipeline and an inner pipeline, the inner pipeline is buried in the test soil, and the outer pipeline is coaxially arranged outside the test soil box; the jacking piece is used for driving the outer pipeline to jack the inner pipeline out of the test soil box; the measuring assembly is used for monitoring the pipe soil contact pressure and the friction force; the measuring assembly comprises a first friction force measuring piece, a second friction force measuring piece and a pipe circumference contact pressure measuring piece; the grouting assembly is used for injecting slurry into an annular gap between the outer pipeline and the transparent soil; the control component is used for controlling the jacking speed of the test pipeline and grouting parameters of the grouting component; and the underground water simulation assembly is used for simulating the underground water level. The invention mainly solves the problem that the characteristics of the jacking pipe Zhou Shouli can not be accurately evaluated under the grouting effect.
Description
Technical Field
The invention relates to the technical field of pipe jacking engineering, in particular to a test device for measuring the circumferential stress of a pipe jacking pipe and a use method thereof.
Background
The jacking method is to provide jacking force by means of jacking equipment, overcome friction force between the pipeline and surrounding soil body and jack the pipeline into the soil according to a designed track. The construction process has no ground excavation, no ground building removal, short construction period, high safety index and low comprehensive cost, and has obvious economic and social benefits. In recent years, the pipe jacking method is widely used for municipal works such as urban underground water supply and drainage pipelines, communication cable laying and the like.
In pipe jacking construction engineering, the grouting pump can inject bentonite slurry into the periphery of the pipeline through the grouting holes so as to reduce friction force between the pipeline and soil around the pipeline, further reduce jacking equipment investment and avoid damage to the pipeline structure and soil around the pipeline due to overlarge jacking force. However, engineering practices have shown that mud injection has significant impact on the tube Zhou Shouli characteristics, such as tube circumference contact pressure, friction, and tube-to-soil friction coefficient, thereby making it difficult to accurately evaluate the magnitude of the jacking force actually required. When the jacking force is estimated to be too large, the power and the cost of jacking equipment are obviously improved, the risk of cracking of the pipe joint under the action of larger pressure is increased, and meanwhile, the residual jacking force is fully acted on the soil body of the excavation surface, so that the earth surface is raised and deformed; when the pushing force is estimated to be too small, the pipeline and the push bench cannot be pushed into soil, the excavated surface cannot be supported in time, and therefore the surface collapse deformation is caused.
Therefore, the key point of accurately evaluating the jacking force is to reasonably evaluate the characteristics of the pipe Zhou Shouli such as the contact pressure, friction force and friction coefficient of the pipe circumference under the grouting effect. At present, part of researches are carried out to obtain different pipe-soil friction coefficients and friction force change rules through a concrete-soil interface direct shear test, but the method cannot simulate the random distribution of pipes Zhou Nijiang and cannot be used for researching the characteristics of the pipes Zhou Shouli under the grouting effect; part of researches clarify the change rule of the pipe-soil contact pressure and reversely calculate the friction force through on-site monitoring, but the method has more related variable factors and is difficult to accurately describe the friction action behavior between the pipe and the soil.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the prior art cannot be used for researching the characteristics of the pipe jacking pipe Zhou Shouli under the grouting effect, so as to provide a test device for measuring the pipe jacking pipe circumference stress and a use method thereof.
In order to solve the above problems, the present invention provides a test device for measuring the circumferential stress of a push pipe, comprising:
the test soil box is used for containing test soil;
the test pipeline comprises an outer pipeline and an inner pipeline which are fixedly connected, the inner pipeline is buried in test soil, and the outer pipeline is arranged outside the test soil box;
the jacking piece is used for driving the outer pipeline to jack the inner pipeline out of the test soil box;
the measuring assembly comprises a first friction force measuring piece, a second friction force measuring piece and a pipe circumference contact pressure measuring piece, wherein the first friction force measuring piece is fixed on the contact surface of the outer pipe and the jacking piece, the second friction force measuring piece is fixed on the contact surface of the inner pipe and the outer pipe, and the pipe circumference contact pressure measuring piece is fixed on the outer surface of the outer pipe;
the grouting assembly comprises a grouting pump, a slurry pipe, a grouting main pipe and grouting branch pipes, wherein the grouting pump injects slurry into an annular gap between an outer pipeline and test soil through the slurry pipe, the grouting main pipe and the grouting branch pipes;
the control assembly comprises a controller, and the controller is used for controlling the jacking speed of the test pipeline and grouting parameters of the grouting assembly.
Optionally, the diameter of the inner conduit is greater than the diameter of the outer conduit.
Optionally, the axis of the inner pipe and the axis of the outer pipe coincide and one end of the inner pipe is adhesively fixed to one end of the outer pipe.
Optionally, the outer and inner pipes are equal in length and equal to the length of the test soil box.
Optionally, the grouting pump is connected with the slurry pond through a slurry pipe, and the grouting pump is respectively connected with grouting holes on the first grouting section, the second grouting section and the third grouting section through a grouting main pipe and a grouting branch pipe.
Optionally, the outer pipeline is equipped with first slip casting section, second slip casting section and third slip casting section in proper order in the axis direction, all be provided with four grouting holes along circumferencial direction equiangle on first slip casting section, second slip casting section and the third slip casting section.
Optionally, the second grouting section is provided with a pipe circumference contact pressure measuring piece along the circumferential direction with equal angle.
Optionally, a first opening and closing member is arranged on the grouting main pipe, and the first opening and closing member and the grouting pump are respectively connected and communicated with the controller.
Optionally, the control assembly further comprises a display screen and a memory, and the display screen and the memory are respectively connected with the controller for communication.
Optionally, the underground water simulation assembly comprises a water inlet pipe and a water outlet pipe, wherein two ends of the water inlet pipe are respectively connected with the water inlet tank and the test soil box, two ends of the water outlet pipe are respectively connected with the water outlet tank and the test soil box, one end of the water inlet pipe is arranged above the inner pipeline, and one end of the water outlet pipe is arranged below the inner pipeline.
Optionally, the water inlet pipe is provided with a second opening and closing part, and the water outlet pipe is provided with a third opening and closing part.
The use method of the test device for measuring the circumferential stress of the pipe jacking pipe comprises the steps that a controller controls the jacking speed of a jacking piece and grouting parameters of a grouting assembly; in the process that the jacking piece jacks the inner pipeline out of the test soil box through the outer pipeline, the grouting assembly performs annular gap grouting between the outer pipeline and the test soil; the first friction force measuring piece is used for measuring the total friction force between the test pipeline and the test soil, the second friction force measuring piece is used for measuring the friction force between the inner pipeline and the test soil, and the difference between the measured value of the first friction force measuring piece and the measured value of the second friction force measuring piece is the friction force between the outer pipeline and the test soil.
Optionally, when the first grouting section enters the test soil box, starting a grouting pump through the controller and opening a corresponding first opening and closing piece, and pumping slurry to a grouting hole of the first grouting section through the grouting main pipe and the grouting branch pipe by the grouting pump;
continuously pumping slurry into the grouting holes of the first grouting section, opening the corresponding first opening and closing piece through the controller when the second grouting section enters the test soil box, and pumping the slurry into the grouting holes of the second grouting section through the grouting main pipe and the grouting branch pipe by the grouting pump;
and continuously pumping slurry into grouting holes of the first grouting section and the second grouting section, and opening a corresponding first opening and closing piece through a controller when the third grouting section enters the test soil box, wherein a grouting pump pumps the slurry into the grouting holes of the third grouting section through a grouting main pipe and a grouting branch pipe.
A using method of the measuring pipe jacking Zhou Shouli comprises the steps that a controller controls the jacking speed of a test pipeline and grouting parameters of a grouting assembly, the grouting assembly injects slurry into an annular gap between an outer pipeline and transparent soil, and a measuring assembly monitors pipe soil friction force and contact pressure.
Optionally, the method comprises the following steps:
s1, selecting test soil and measuring physical properties of the test soil, including internal friction angle, cohesive force and density according to test requirements;
s2, preparing slurry according to test requirements, and measuring basic properties of the slurry, including viscosity and fluid loss;
s3, filling test soil in layers according to test requirements, and placing an inner pipeline into a test soil box until the filling height reaches a preset burial depth;
s4, adjusting the layout heights of the water inlet pipe and the water outlet pipe according to the test requirement, opening the second opening and closing element on the water inlet pipe and closing the third opening and closing element on the water outlet pipe;
s5, after the test soil in the test soil box is in a saturated state, opening a third opening and closing part on the drain pipe;
s6, adjusting the telescopic end of the jacking piece and enabling the telescopic end of the jacking piece to be in contact with the end face of the outer pipeline;
s7, setting the jacking speed of the jacking piece and grouting parameters of a grouting pump through a controller, and closing the first opening and closing piece;
s8, starting the jacking piece through the controller, and starting the grouting pump through the controller and opening the corresponding first opening and closing piece when the first grouting section enters the test soil box; when the second grouting section enters the test soil box, the corresponding first opening and closing piece is opened through the controller; when the third grouting section enters the test soil box, opening a corresponding first opening and closing piece through a controller;
s9, closing the jacking piece, the grouting pump and the first opening and closing piece through the controller when the outer pipeline completely enters the test soil box and the inner pipeline is completely ejected out of the test soil box;
s10, processing and analyzing test data according to the following steps:
s101, classifying measured values of a first friction force measuring piece, a second friction force measuring piece and a pipe circumference contact pressure measuring piece according to 4 states: (1) when the first grouting section does not enter the test soil box, the first grouting section is recorded asP a0 、P b0 AndP c0 the method comprises the steps of carrying out a first treatment on the surface of the (2) When the first grouting section enters the test soil box, the first grouting section is recorded asP a1 、P b1 AndP c1 the method comprises the steps of carrying out a first treatment on the surface of the (3) When the second grouting section enters the test soil box, the second grouting section is recorded asP a2 、P b2 AndP c2 the method comprises the steps of carrying out a first treatment on the surface of the (4) When the third grouting section enters the test soil box, the third grouting section is recorded asP a3 、P b3 AndP c3 ；
s102, acquiring grouting additional pressure under different grouting conditions through the formula (1) and the formula (2):
（1）
（2）
wherein ,ΔP c2 Adding pressure to grouting under the grouting condition of the front pipeline; deltaP c3 Adding pressure for grouting under the condition of simultaneous grouting of front and rear pipelines;P c the average value of the soil pressure born by the test pipeline can be calculated according to the formula (3);
（3）
wherein ,hthe method comprises the steps of setting the buried depth of a test pipeline in a test soil box;ρis the density of the test soil;φis the internal friction angle of the test soil;cthe adhesive force of the test soil;Dis the diameter of the outer pipeline;Kis the soil pressure coefficient;B 1 the width of the soil arch can be obtained by calculation in the formula (4);
（4）
s103, respectively obtaining the friction force around the pipe under different grouting conditions through the steps of (5) to (8):
（5）
（6）
（7）
（8）
wherein ,P f 0 is the friction force around the pipe under the condition of no grouting;P f 1 the friction force of the circumference of the pipe under the grouting condition of only one grouting section;P f 2 the friction force of the circumference of the pipe under the condition of simultaneous grouting of two grouting sections;P f 3 three are providedThe friction force of the circumference of the pipe under the condition of grouting the section at the same time;
s104, respectively obtaining friction coefficients of pipe soil under different grouting conditions through the steps of (9) to (12):
（9）
（10）
（11）
（12）
wherein ，f 0 Andl 0 the friction coefficient and the jacking distance of the pipe soil under the condition of no grouting are respectively set;f 1 andl 1 the friction coefficient and the jacking distance of pipe soil under the grouting condition of only one grouting section are respectively set;f 2 andl 2 the friction force of the circumference of the pipe under the condition that two grouting sections are simultaneously grouting is respectively shown;f 3 andl 3 the friction coefficient and the jacking distance of pipe soil under the condition of simultaneous grouting of three grouting sections are respectively shown.
The technical scheme of the invention has the following advantages:
the invention provides a test device for measuring the circumferential stress of a pipe-jacking pipe, which comprises: the test soil box is used for accommodating test soil; the test pipeline comprises an outer pipeline and an inner pipeline, the inner pipeline is buried in the test soil, and the outer pipeline is coaxially arranged outside the test soil box; the jacking piece is used for driving the outer pipeline to jack the inner pipeline out of the test soil box; the measuring assembly comprises a first friction force measuring piece, a second friction force measuring piece and a pipe circumference contact pressure measuring piece, wherein the first friction force measuring piece is fixed on the contact surface of the outer pipeline and the jacking piece, the second friction force measuring piece is fixed on the contact surface of the inner pipeline and the outer pipeline, and the pipe circumference contact pressure measuring piece is fixed on the outer surface of the outer pipeline; the grouting assembly is used for injecting slurry into an annular gap between the outer pipeline and the transparent soil; and the control component is used for controlling the jacking speed of the test pipeline and grouting parameters of the grouting component. In the concrete implementation process, when the jacking piece pushes the inner pipeline through the outer pipeline, the inner pipeline and the outer pipeline are both subjected to friction force from test soil in the test soil box. Since the first friction measuring member is fixed to the contact surface of the outer pipe and the jacking member, that is, the measured value of the first friction measuring member is the total friction force applied to the test pipe. Since the second friction measuring member is fixed to the contact surface of the inner pipe and the outer pipe, that is, the measured value of the second friction measuring member is the friction force applied to the inner pipe. The difference between the measured value of the first friction force measuring piece and the measured value of the second friction force measuring piece is the friction force between the outer pipeline and the test soil, so that scientific researchers can accurately acquire the pipe soil friction force under the grouting condition and the change rule of the pipe soil friction force along with the jacking distance in real time.
According to the test device for measuring the circumferential stress of the pipe, the diameter of the inner pipeline is larger than that of the outer pipeline, so that the permeation and diffusion process of slurry in an annular gap between a pipe joint of the pipe jacking pipe and a soil body around the pipe in the soil body around the pipe is truly simulated. 3. According to the test device for measuring the circumferential stress of the pipe-jacking pipe, the length of the inner pipeline is equal to that of the test soil box, so that the inner pipeline is completely buried in the test soil box.
4. The invention provides a test device for measuring the circumferential stress of a pipe jacking pipe, which also comprises a grouting assembly, wherein the grouting assembly comprises a grouting pump, a slurry pipe, a grouting main pipe and a grouting branch pipe, the grouting pump is connected with a slurry pool through the slurry pipe, and the grouting pump is respectively connected with grouting holes on a first grouting section, a second grouting section and a third grouting section through the grouting main pipe and the grouting branch pipe, so that the grouting process in the pipe jacking process can be truly reduced.
5. The invention provides a test device for measuring the circumferential stress of a pipe-jacking pipe, wherein four pipe circumferential contact pressure measuring pieces are distributed on a second grouting section at equal angles and are used for monitoring the pipe-soil contact pressure between an outer pipe and test soil at different positions (the pipe top, the pipe bottom and the arching line).
6. According to the test device for measuring the circumferential stress of the pipe jacking pipe, the grouting main pipe is provided with the first opening and closing piece, the first opening and closing piece and the grouting pump are respectively connected and communicated with the controller, and grouting pressure, grouting time and grouting quantity can be accurately controlled through the first opening and closing piece and the grouting pump.
7. The invention provides a test device for measuring the circumferential stress of a pipe-jacking pipe, wherein a control assembly further comprises a display screen and a memory, and the display screen and the memory are respectively connected and communicated with a controller so as to facilitate scientific researchers to observe and store jacking and grouting parameters in real time.
8. The invention provides a test device for measuring the circumferential stress of a pipe-jacking pipe, which also comprises a groundwater simulation assembly, wherein the groundwater simulation assembly comprises a water inlet pipe and a water outlet pipe, two ends of the water inlet pipe are respectively connected with a water inlet tank and a test soil box, two ends of the water outlet pipe are respectively connected with a water outlet tank and the test soil box, one end of the water inlet pipe is arranged above an inner pipeline, one end of the water outlet pipe is arranged below the inner pipeline, a second opening and closing part is arranged on the water inlet pipe, and a third opening and closing part is arranged on the water outlet pipe. The influence of groundwater on the characteristics of the pipe Zhou Shouli can be truly reflected through the groundwater simulation assembly. In addition, by adjusting the arrangement positions of the water inlet pipe and the water outlet pipe, the groundwater condition of the local area can be accurately controlled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a test apparatus for measuring a push pipe Zhou Shouli according to an embodiment of the present invention;
fig. 2 is a schematic layout view of a pressure sensor on a section of a second grouting hole and a schematic connection diagram of grouting branch pipes and grouting holes according to an embodiment of the present invention.
Reference numerals illustrate: 1. a test soil box; 2. testing soil; 3. an outer pipe; 4. an inner pipe; 5. a jacking member; 6. a control assembly; 7. a first friction force measuring member; 8. a first grouting section; 9. a second grouting section; 10. a third grouting section; 11. grouting branch pipes; 12. a first opening and closing member; 13. a grouting pump; 14. a slurry pool; 15. a slurry pipe; 16. a second friction force measuring member; 17. a water inlet pipe; 18. a second opening and closing member; 19. a water inlet tank; 20. a drain pipe; 21. a third opening and closing member; 22. a drainage pool; 23. grouting a main pipe; 24. grouting holes; 25. the circumference of the tube contacts the pressure measurement member.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
One specific embodiment of a test device for measuring the circumferential stress of a pipe jacking pipe shown in fig. 1 and 2 comprises a test soil box 1 for containing test soil 2, wherein a test pipeline is buried in the test soil 2, a jacking piece 5 is arranged outside the test soil box 1, and the telescopic end of the jacking piece 5 is in contact with one end of an outer pipeline 3. Specifically, the jacking piece 5 is a hydraulic cylinder, the test soil 2 is silt, and the side plates and the bottom plate of the test soil box 1 are made of stainless steel.
As shown in fig. 1, the test tube comprises an inner tube 4 and an outer tube 3 which are adhesively fixed, wherein the diameter of the inner tube 4 is larger than that of the outer tube 3, and the lengths of the inner tube 4 and the outer tube 3 are equal to each other and are 0.5m. It should be noted that the inner pipe 4 is completely embedded in the test soil 2, i.e. the length of the inner pipe 4 is equal to the length of the test soil box 1. As shown in fig. 1, the outer pipe 3 is provided with a first grouting section 8, a second grouting section 9 and a third grouting section 10 in sequence along the axial direction, and the first grouting section 8 is spaced from the inner pipe4 distance from the contact surface of the outer pipe 3l 1 Distance of second grouting section 9 from first grouting section 8 =0.05ml 2 Distance of third grouting section 10 from second grouting section 9 =0.1ml 3 =0.1m. It should be noted that four grouting holes 24 are provided on the first grouting section 8, the second grouting section 9 and the third grouting section 10 at equal angles along the circumference.
For measuring the friction and the soil pressure to which the test pipe is subjected when moving in the test soil 2, as shown in fig. 1, a measuring assembly is further included, which comprises a first friction measuring member 7, a second friction measuring member 16 and a peripheral contact pressure measuring member 25. Wherein the first friction force measuring member 7 is fixed on the contact surface of the outer pipe 3 and the jacking member 5, the second friction force measuring member 16 is fixed on the contact surface of the inner pipe 4 and the outer pipe 3, and the pipe circumference contact pressure measuring member 25 is fixed on the outer surface of the outer pipe 3. Specifically, the first friction force measuring member 7 is an axial force meter, the second friction force measuring member 16 is a piezoelectric film sensor, and the pipe circumference contact pressure measuring member 25 is a miniature earth pressure box.
As shown in fig. 1, the grouting assembly comprises a grouting pump 13, a slurry pipe 15, a grouting main pipe 23 and a grouting branch pipe 11, wherein the grouting pump 13 is connected with a slurry pond 14 through the slurry pipe 15, and the grouting pump 13 is respectively connected with grouting holes 24 on the first grouting section 8, the second grouting section 9 and the third grouting section 10 through the grouting main pipe 23 and the grouting branch pipe 11. To control the grouting pressure, grouting time and grouting amount, a grouting main pipe 23 is provided with a first opening and closing member 12. Specifically, the first shutter 12 is a solenoid valve. To meet the space requirement for mud diffusion, the width of the test soil box 1 is 10 times the diameter of the outer pipeline 3, and the height of the test soil box 1 is 6 times the diameter of the outer pipeline 3.
As shown in fig. 1, the groundwater simulation assembly includes a water inlet pipe 17 and a water outlet pipe 20, both ends of the water inlet pipe 17 are respectively connected with a water inlet tank 19 and a test soil box 1, and both ends of the water outlet pipe 20 are respectively connected with a water outlet tank 22 and the test soil box 1. One end of the water inlet pipe 17 is arranged above the inner pipe 4, and one end of the water outlet pipe 20 is arranged below the inner pipe 4. The water inlet pipe 17 is provided with a second opening and closing part 18, and the water discharge pipeline 20 is provided with a third opening and closing part 21. Specifically, the second shutter 18 and the third shutter 21 are solenoid valves.
As shown in fig. 1, the control assembly 6 includes a controller, a display screen and a memory, wherein the controller is respectively connected and communicated with the first opening and closing member 12, the second opening and closing member 18, the third opening and closing member 21, the jacking member 5, the grouting pump 13, the display screen and the memory. As shown in fig. 1 and 2, the second grouting section 9 is provided with a pipe circumference contact pressure measuring member 25 at an equal angle in the circumferential direction.
The application method of the test device for measuring the circumferential stress of the pipe-jacking pipe comprises the following steps:
s1, selecting test soil 2 according to test requirements, and measuring physical properties of the test soil 2, including internal friction angle, cohesive force and density;
s2, preparing slurry according to test requirements, and measuring basic properties of the slurry, including viscosity and fluid loss;
s3, filling test soil 2 in layers according to test requirements, and placing an inner pipeline 4 into the test soil box 1 until the filling height reaches a preset burial depth;
s4, according to test requirements, adjusting the layout heights of the water inlet pipe 17 and the water outlet pipe 20, opening the second opening and closing element 18 on the water inlet pipe 17 and closing the third opening and closing element 21 on the water outlet pipe 20;
s5, after the test soil 2 in the test soil box 1 is in a saturated state, opening a third opening and closing piece 21 on the drain pipe 20;
s6, adjusting the telescopic end of the jacking piece 5 and enabling the telescopic end of the jacking piece 5 to be in contact with the end face of the outer pipeline 3;
s7, setting the jacking speed of the jacking piece 5 and grouting parameters of the grouting pump 13 through a controller, and closing the first opening and closing piece 12;
s8, starting the jacking piece 5 through a controller, and starting the grouting pump 13 through the controller and opening the corresponding first opening and closing piece 12 when the first grouting section 8 enters the test soil box 1; when the second grouting section 9 enters the test soil box 1, the corresponding first opening and closing piece 12 is opened through the controller; when the third grouting section 10 enters the test soil box 1, the corresponding first opening and closing piece 12 is opened through the controller;
s9, closing the jacking piece 5, the grouting pump 13 and the first opening and closing piece 12 through a controller when the outer pipeline 3 completely enters the test soil box 1 and the inner pipeline 4 is completely ejected out of the test soil box 1;
s10, processing and analyzing test data according to the following steps:
s101, classifying the measured values of the first friction force measuring member 7, the second friction force measuring member 16, and the pipe circumference contact pressure measuring member 25 into 4 states: (1) when the first grouting section 8 does not enter the test soil box 1, the first grouting section 8 is recorded as each ofP a0 、P b0 AndP c0 the method comprises the steps of carrying out a first treatment on the surface of the (2) When the first grouting section 8 enters the test soil box 1, the first grouting section 8 is recorded as each ofP a1 、P b1 AndP c1 the method comprises the steps of carrying out a first treatment on the surface of the (3) When the second grouting section 9 enters the test soil box 1, the second grouting section is recorded as each ofP a2 、P b2 AndP c2 the method comprises the steps of carrying out a first treatment on the surface of the (4) When the third grouting section 10 enters the test soil box 1, the third grouting section is recorded as each ofP a3 、P b3 AndP c3 ；
s102, acquiring grouting additional pressure under different grouting conditions through the formula (1) and the formula (2):
（1）
（2）
wherein ,ΔP c2 Adding pressure to grouting under the grouting condition of the front pipeline; deltaP c3 Adding pressure for grouting under the condition of simultaneous grouting of front and rear pipelines;P c the average value of the soil pressure applied to the test pipeline can be calculated according to the formula (3).
（3）
wherein ,hthe buried depth of the test pipeline in the test soil box (1) is set;ρthe density of the test soil 2;φis the internal friction angle of the test soil 2;cfor testing the adhesion of soil 2Force gathering;Dis the diameter of the outer pipeline 3;Kis the soil pressure coefficient;B 1 the width of the soil arch can be calculated by the formula 4.
（4）
S103, respectively obtaining the friction force around the pipe under different grouting conditions through the steps of (5) to (8):
（5）
（6）
（7）
（8）
wherein ,P f 0 is the friction force around the pipe under the condition of no grouting;P f 1 the friction force of the circumference of the pipe under the grouting condition of only one grouting section;P f 2 the friction force of the circumference of the pipe under the condition of simultaneous grouting of two grouting sections;P f 3 is the friction force of the circumference of the pipe under the condition of simultaneous grouting of three grouting sections.
S104, respectively obtaining friction coefficients of pipe soil under different grouting conditions through the steps of (9) to (12):
（9）
（10）
（11）
（12）
wherein ，f 0 Andl 0 the friction coefficient and the jacking distance of the pipe soil under the condition of no grouting are respectively set;f 1 andl 1 the friction coefficient and the jacking distance of pipe soil under the grouting condition of only one grouting section are respectively set;f 2 andl 2 the friction force of the circumference of the pipe under the condition that two grouting sections are simultaneously grouting is respectively shown;f 3 andl 3 the friction coefficient and the jacking distance of pipe soil under the condition of simultaneous grouting of three grouting sections are respectively shown.
The test device for measuring the circumferential stress of the push pipe provided by the invention has the following advantages:
(1) The controller can control the jacking speed of the jacking piece 5, so as to study the influence of different jacking speeds on the pipe Zhou Shouli; according to engineering practical experience, the jacking speed is generally set to be 1-8 cm/min.
(2) The performance of the slurry can be changed by changing the slurry formula, so that the influence of different slurry performances on the pipe Zhou Shouli of the slurry can be conveniently studied;
(3) The controller can control grouting pressure, grouting time and grouting amount through the grouting pump 13 and the first opening and closing piece 12, so that the influence of different grouting processes on the pipe Zhou Shouli can be conveniently studied. Preferably, the grouting pressureP=（1~1.5）×H×γGrouting timet=l/sGrouting amountQ=（2~10）×π/4×（R 2 -r 2）. in the formula ：Hfor the burial depth of the outer pipe 3 in the test soil box 1,γin order to test the soil 2 weight of the soil,lfor the length of the outer pipe 3,sfor the jacking speed, the jacking speed is set to be equal to the jacking speed,Rfor the radius of the outer pipe 3,rradius of the inner pipeline 4;
(4) By adjusting the arrangement positions of the water inlet pipe 17 and the water outlet pipe 20, the groundwater condition of the local area in the test soil box 1 can be accurately controlled.
As an alternative embodiment, the test soil 2 may also be gravel, coarse sand, medium sand, fine sand, silt, clay.
As an alternative embodiment, the outer pipe 3 and the inner pipe 4 may also be connected by means of threads or sockets, etc.
As an alternative embodiment, the number of grouting holes 24 in the grouting section may also be 3, 5, 6 or even more.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (14)
1. Test device of measurement push pipe circumference atress, its characterized in that includes:
a test soil box (1), the test soil box (1) being adapted to hold test soil (2);
the test pipeline comprises an outer pipeline (3) and an inner pipeline (4) which are fixedly connected, the inner pipeline (4) is buried in the test soil (2), and the outer pipeline (3) is arranged outside the test soil box (1);
the jacking piece (5) is used for driving the outer pipeline (3) to push the inner pipeline (4) out of the test soil box (1);
the measuring assembly comprises a first friction force measuring piece (7), a second friction force measuring piece (16) and a tube periphery contact pressure measuring piece (25), wherein the first friction force measuring piece (7) is fixed on the contact surface of the outer tube (3) and the jacking piece (5), the second friction force measuring piece (16) is fixed on the contact surface of the inner tube (4) and the outer tube (3), and the tube periphery contact pressure measuring piece (25) is fixed on the outer surface of the outer tube (3);
the grouting assembly comprises a grouting pump (13), a slurry pipe (15), a grouting main pipe (23) and grouting branch pipes (11), wherein the grouting pump (13) injects slurry into an annular gap between an outer pipeline (3) and test soil (2) through the slurry pipe (15), the grouting main pipe (23) and the grouting branch pipes (11);
and the control assembly (6) comprises a controller, and the controller is used for controlling the jacking speed of the test pipeline and the grouting parameters of the grouting assembly.
2. The test device for measuring the circumferential stress of a push pipe according to claim 1, wherein the diameter of the inner pipe (4) is larger than the diameter of the outer pipe (3).
3. The test device for measuring the circumferential stress of the push pipe according to claim 1, wherein the axis of the inner pipe (4) and the axis of the outer pipe (3) are coincident and one end of the inner pipe (4) is adhered and fixed to one end of the outer pipe (3).
4. Test device for measuring the circumferential stress of a push pipe according to claim 1, characterized in that the outer pipe (3) and the inner pipe (4) are equal in length and equal in length to the test soil box (1).
5. Test device for measuring the circumferential stress of a pipe-in-pipe according to any one of claims 1-4, characterized in that the grouting pump (13) is connected to the slurry pond (14) via a slurry pipe (15), and that the grouting pump (13) is connected to grouting holes (24) in the first grouting section (8), the second grouting section (9) and the third grouting section (10) via a grouting main pipe (23) and a grouting branch pipe (11), respectively.
6. The test device for measuring the circumferential stress of the pipe-jacking tube according to claim 5, wherein the outer tube (3) is sequentially provided with a first grouting section (8), a second grouting section (9) and a third grouting section (10) in the axial direction, and four grouting holes (24) are formed in the first grouting section (8), the second grouting section (9) and the third grouting section (10) along the circumferential direction at equal angles.
7. The test device for measuring the circumferential stress of the push pipe according to claim 6, wherein the second grouting section (9) is provided with a circumferential contact pressure measuring piece (25) at equal angles along the circumferential direction.
8. The test device for measuring the circumferential stress of the pipe-jacking tube according to claim 6, wherein the grouting main tube (23) is provided with a first opening and closing member (12), and the first opening and closing member (12) and the grouting pump (13) are respectively connected and communicated with the controller.
9. The test device for measuring the circumferential stress of a push pipe according to claim 8, wherein the control assembly (6) further comprises a display screen and a memory, and the display screen and the memory are respectively connected and communicated with the controller.
10. The test device for measuring the circumferential stress of a pipe-jacking pipe according to claim 5, further comprising a groundwater simulation assembly, wherein the groundwater simulation assembly comprises a water inlet pipe (17) and a water outlet pipe (20), two ends of the water inlet pipe (17) are respectively connected with a water inlet tank (19) and a test soil box (1), two ends of the water outlet pipe (20) are respectively connected with a water outlet tank (22) and the test soil box (1), one end of the water inlet pipe (17) is arranged above the inner pipeline (4), and one end of the water outlet pipe (20) is arranged below the inner pipeline (4).
11. The test device for measuring the circumferential stress of the push pipe according to claim 10, wherein the water inlet pipe (17) is provided with a second opening and closing member (18), and the water outlet pipe (20) is provided with a third opening and closing member (21).
12. The use method of the test device for measuring the circumferential stress of the pipe-jacking pipe is characterized in that the controller is used for controlling the jacking speed of the jacking piece (5) and the grouting parameters of the grouting assembly; in the process that the jacking piece (5) pushes the inner pipeline (4) out of the test soil box (1) through the outer pipeline (3), the grouting assembly performs annular gap grouting between the outer pipeline (3) and the test soil (2); the first friction force measuring piece (7) is used for measuring the total friction force between the test pipeline and the test soil (2), the second friction force measuring piece (16) is used for measuring the friction force between the inner pipeline (4) and the test soil (2), and the difference between the measured value of the first friction force measuring piece (7) and the measured value of the second friction force measuring piece (16) is the friction force between the outer pipeline (3) and the test soil (2).
13. The method of using a test device for measuring the circumferential stress of a pipe-in-pipe according to claim 12, characterized in that when a first grouting section (8) enters a test soil box (1), a grouting pump (13) is started by a controller and a corresponding first opening and closing member (12) is opened, and the grouting pump (13) pumps slurry to a grouting hole (24) of the first grouting section (8) through a grouting main pipe (23) and a grouting branch pipe (11);
continuously pumping slurry into the grouting holes (24) of the first grouting section (8), opening the corresponding first opening and closing piece (12) through a controller when the second grouting section (9) enters the test soil box (1), and pumping the slurry into the grouting holes (24) of the second grouting section (9) through the grouting main pipe (23) and the grouting branch pipe (11) by the grouting pump (13);
and continuously pumping slurry into grouting holes (24) of the first grouting section (8) and the second grouting section (9), and opening a corresponding first opening and closing piece (12) through a controller when the third grouting section (10) enters the test soil box (1), wherein the grouting pump (13) pumps the slurry into the grouting holes (24) of the third grouting section (10) through a grouting main pipe (23) and a grouting branch pipe (11).
14. The method of using a test device for measuring peripheral stress of a push pipe according to claim 13, comprising the steps of:
s1, selecting test soil (2) according to test requirements, and measuring physical properties of the test soil (2), including internal friction angle, cohesive force and density;
s2, preparing slurry according to test requirements, and measuring basic properties of the slurry, including viscosity and fluid loss;
s3, filling test soil (2) in layers according to test requirements, and placing an inner pipeline (4) into the test soil box (1) until the filling height reaches a preset burial depth;
s4, according to test requirements, adjusting the layout heights of the water inlet pipe (17) and the water outlet pipe (20), opening a second opening and closing element (18) on the water inlet pipe (17) and closing a third opening and closing element (21) on the water outlet pipe (20);
s5, after the test soil (2) in the soil box (1) to be tested is in a saturated state, opening a third opening and closing piece (21) on the drain pipe (20);
s6, adjusting the telescopic end of the jacking piece (5) and enabling the telescopic end of the jacking piece (5) to be in contact with the end face of the outer pipeline (3);
s7, setting the jacking speed of the jacking piece (5) and grouting parameters of the grouting pump (13) through a controller, and closing the first opening and closing piece (12);
s8, starting the jacking piece (5) through the controller, and starting the grouting pump (13) through the controller and opening the corresponding first opening and closing piece (12) when the first grouting section (8) enters the test soil box (1); when the second grouting section (9) enters the test soil box (1), the corresponding first opening and closing piece (12) is opened through the controller; when the third grouting section (10) enters the test soil box (1), the corresponding first opening and closing piece (12) is opened through the controller;
s9, closing the jacking piece (5), the grouting pump (13) and the first opening and closing piece (12) through the controller when the outer pipeline (3) completely enters the test soil box (1) and the inner pipeline (4) is completely ejected out of the test soil box (1);
s10, processing and analyzing test data according to the following steps:
s101, a first friction force measuring piece (7) and a second friction force measuring pieceThe measurements of the wiper force measuring member (16) and the tube periphery contact pressure measuring member (25) are classified into 4 states: (1) when the first grouting section (8) does not enter the test soil box (1), the first grouting section is recorded asP a0 、P b0 AndP c0 the method comprises the steps of carrying out a first treatment on the surface of the (2) When the first grouting section (8) enters the test soil box (1), the first grouting section is recorded asP a1 、P b1 AndP c1 the method comprises the steps of carrying out a first treatment on the surface of the (3) When the second grouting section (9) enters the test soil box (1), the second grouting section is recorded asP a2 、P b2 AndP c2 the method comprises the steps of carrying out a first treatment on the surface of the (4) When the third grouting section (10) enters the test soil box (1), the third grouting section is recorded asP a3 、P b3 AndP c3 ；
s102, acquiring grouting additional pressure under different grouting conditions through the formula (1) and the formula (2):
（1）
（2）
wherein ,ΔP c2 Adding pressure to grouting under the grouting condition of the front pipeline; deltaP c3 Adding pressure for grouting under the condition of simultaneous grouting of front and rear pipelines;P c the average value of the soil pressure born by the test pipeline can be calculated according to the formula (3);
（3）
wherein ,hthe buried depth of the test pipeline in the test soil box (1) is set;ρis the density of the test soil (2);φis the internal friction angle of the test soil (2);cthe adhesive force of the test soil (2);Dis the diameter of the outer pipeline (3);Kis the soil pressure coefficient;B 1 for the width of the soil arch, the method can calculate by the method (4)Obtaining;
（4）
s103, respectively obtaining the friction force around the pipe under different grouting conditions through the steps of (5) to (8):
（5）
（6）
（7）
（8）
wherein ,P f 0 is the friction force around the pipe under the condition of no grouting;P f 1 the friction force of the circumference of the pipe under the grouting condition of only one grouting section;P f 2 the friction force of the circumference of the pipe under the condition of simultaneous grouting of two grouting sections;P f 3 the friction force of the circumference of the pipe under the condition of simultaneous grouting of three grouting sections;
s104, respectively obtaining friction coefficients of pipe soil under different grouting conditions through the steps of (9) to (12):
（9）
（10）
（11）
（12）
wherein ，f 0 Andl 0 the friction coefficient and the jacking distance of the pipe soil under the condition of no grouting are respectively set;f 1 andl 1 the friction coefficient and the jacking distance of pipe soil under the grouting condition of only one grouting section are respectively set;f 2 andl 2 the friction force of the circumference of the pipe under the condition that two grouting sections are simultaneously grouting is respectively shown;f 3 andl 3 the friction coefficient and the jacking distance of pipe soil under the condition of simultaneous grouting of three grouting sections are respectively shown.
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