CN114184484A - Device and method for monitoring joint sealing and stress transmission in pipe jacking pipe joint deflection state - Google Patents
Device and method for monitoring joint sealing and stress transmission in pipe jacking pipe joint deflection state Download PDFInfo
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- CN114184484A CN114184484A CN202111424582.2A CN202111424582A CN114184484A CN 114184484 A CN114184484 A CN 114184484A CN 202111424582 A CN202111424582 A CN 202111424582A CN 114184484 A CN114184484 A CN 114184484A
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- 238000007789 sealing Methods 0.000 title claims abstract description 65
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 title claims abstract description 7
- 238000012806 monitoring device Methods 0.000 claims abstract description 14
- 210000001503 joint Anatomy 0.000 claims description 83
- 238000012360 testing method Methods 0.000 claims description 73
- 229910000831 Steel Inorganic materials 0.000 claims description 50
- 239000010959 steel Substances 0.000 claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000010408 film Substances 0.000 claims description 31
- 238000010008 shearing Methods 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000002023 wood Substances 0.000 claims description 11
- 239000010409 thin film Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000002787 reinforcement Effects 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field, relates to the technical field of trenchless engineering pipe jacking, and particularly relates to a monitoring device and a monitoring method for joint sealing and stress transmission under a pipe jacking joint deflection state.
Description
Technical Field
The invention relates to the technical field of trenchless engineering pipe jacking, in particular to a device and a method for monitoring joint sealing and stress transmission in a pipe jacking pipe joint deflection state.
Background
In recent years, with the acceleration of the modernization process of society, the trenchless technology, especially the pipe jacking technology, is rapidly popularized and applied. However, during construction jacking and after construction is completed, a series of problems due to pipe joint deflection can occur. In the jacking construction process, due to the complexity of stratum conditions, certain axis deviation can occur to the pipe joint, then deviation correction is needed to be performed on the deviation, and in the process, the pipe joint is likely to have poor sealing performance under a deflection state, for example, the condition that the pipe joint damages the pipe joint and leaks water is caused; in addition, after pipe jacking construction is completed, uneven settlement of the foundation may occur, causing shearing or deflection between pipe joints. The joint sealing performance of the pipe joint under pipe joint deflection conditions has no specific means to test.
In addition, in the deflection state of the pipe joints, the transmission of the force between the pipe joints is not clear, and further research is required.
Disclosure of Invention
The invention mainly aims at researching the influence on the sealing performance of the joints of the pipe jacking joints and the stress transmission mode among the pipe joints after the pipe jacking joints in the pipe jacking construction in different stratums deflect, provides a monitoring device for the sealing of the joints and the stress transmission in the deflection state of the pipe jacking joints, and provides technical support and guidance for the deflection problem of the pipe joints in the pipe jacking construction.
In order to achieve the purpose, the invention adopts the specific scheme that: the utility model provides a sealed and atress transmission monitoring devices of joint under push pipe coupling deflection state which characterized in that: the device consists of a fixing and loading device, a joint sealing test device and a pipe joint stress monitoring device; the fixing and loading device consists of a test pit, a guide rail, a jack bracket, a deflection jack and a main jack, wherein the test pit comprises a bottom plate, a side wall, a stress wall and a bearing platform bracket; the side wall is used as a soil retaining structure and is positioned on the side surface of the test pit; the stress wall is designed according to a calculation formula of the bearing capacity of the retaining wall and is used for bearing the jacking force reaction of the main jack, the stress wall comprises a front back wall and a back wall, and a plurality of connected pipe jacking sections are positioned between the front back wall and the back wall; bolts are embedded in the bearing platform brackets and used for fixing and limiting the guide rails, and a plurality of unconnected bearing platform brackets are arranged on a bottom plate of the test pit; the guide rail is arranged on the bearing platform bracket, the guide rail is cut off at the interface position of the first pipe-jacking pipe joint close to the front back wall and is used for installing the joint sealing test device, and the pipe-jacking pipe joint is arranged on the guide rail; the jack support is used for placing a main jack, the jack support and the main jack are positioned between a first pipe jacking section close to the back wall and the back wall, and the back wall is used for bearing jacking force counter force to act on the pipe jacking sections; the deflection jack is positioned below the pipe joint of the push pipe to be deflected and is used for deflecting the pipe joint of the push pipe; the joint sealing test device consists of a steel ring, a rubber air bag, a flange plate, an annular rubber plate, a pressure water bag, an automatic exhaust valve and a digital display pressure gauge, the steel ring is a spiral steel pipe, the inner diameter of the spiral steel pipe is larger than the outer diameter of the pipe joint of the top pipe, the inner diameter of the rubber air bag is larger than the outer diameter of the pipe joint of the top pipe, the rubber air bag is used for inflating and extruding the annular rubber strip to fix the steel ring on the pipe joint of the top pipe and keep the tightness of the tightness testing device, the flange plate is used for connecting the steel ring and the annular rubber plate into a whole, and the annular rubber plate is positioned between the two steel rings and is used as a flexible device for bearing different applied water pressures, the automatic exhaust valve is used for exhausting air in the sealing test device, and the digital display pressure gauge is used for filling water pressure into the joint sealing test device filled with water and simulating the sealing performance of the pipe joint under the condition of pipe joint deflection under different grouting pressures; the pipe joint stress monitoring device consists of strain gauges and film pressure sensors, wherein annular and longitudinal strain gauges are arranged at the axial center position of the inner wall of each pipe joint of the jacking pipe and used for measuring the annular and longitudinal strains of the pipe joints of the jacking pipe; the film pressure sensors are attached to the wood base plate, a plurality of film pressure sensors are uniformly distributed on the cross section of each connection part, the number of groups of the strain gauges and the film pressure sensors is the same as that of the connection positions of the pipelines, and the strain gauges and the film pressure sensors are used for measuring the stress, strain and stress transmission of the pipelines of the pipe joints under different deflection angles and shearing displacement.
And the bottom plate is of a reinforced concrete structure, the side walls are made of brick concrete and cross beams, the bearing platform bracket is cast by reinforced concrete, and the guide rail is made of steel materials.
The method for the device comprises the following specific steps:
the method comprises the following steps that step 1, a test pit comprises a stress wall and side walls, wherein the stress wall comprises a front back wall and a back wall, the front back wall and the back wall are used for resisting the jacking force of a jack and a pipe joint, more than 3 bearing platform brackets are arranged between the front back wall and the back wall of a bottom plate of the test pit, a left track and a right track are installed on the bearing platform brackets, and the separation position of the left track and the right track is the interface position of a first pipe jacking pipe joint close to the front back wall;
step 2, fixing the steel plate on a back wall body, arranging a jack support in a space between the back wall body and the nearest bearing platform bracket, arranging a main jack on the jack support, and placing a jacking ring on a steel rail in front of the main jack;
step 3, sequentially arranging a No. 3 pipe joint, a No. 2 pipe joint and a No. 1 pipe joint from left to right, sleeving a rubber strip, a rubber air bag and a steel ring outside the No. 3 pipe joint and the No. 2 pipe joint on the ground, fixing an annular rubber plate and the steel ring on the No. 3 pipe joint by using a split bolt through a flange plate, fixing one end of the annular rubber plate on the steel ring of the No. 3 pipe joint, and then preassembling the flange plate on the No. 2 pipe joint on the annular rubber plate at the other end;
step 4, arranging strain gauges on all pipe joints on the ground, arranging a plurality of wood gaskets on the sections of the joints of the pipe joints and arranging thin film pressure sensors on the wood gaskets;
step 5, after the left side track and the right side track are laid, hoisting the pipe joint of the jacking pipe to the guide rail by using a crane;
step 6, after the placement is finished, a main jack is used for pushing to enable the three pipe joints to be in a normal butt joint state, the other end of the annular rubber plate is fixed on a steel ring of the No. 2 pipe joint through a flange plate on the No. 2 pipe joint, meanwhile, air is compressed through air compressing ports on the No. 2 pipe joint and the No. 3 pipe joint, the rubber air bag is expanded to extrude an annular rubber strip, the steel ring is fixed on the pipe joints, then an exhaust valve, a pressure gauge, a slurry pump pipeline and an air compressor are installed on the No. 2 pipe joint, equipment is debugged, and the installation of the sealing test device is finished;
step 7, placing two deflection jacks below the No. 2 pipe joint, and placing jack jacking brackets above the jacks to enable jacking force of the jacks to be uniformly applied to the pipe joints;
step 8, two jack clamping grooves are formed in the lower portion of a jack jacking bracket and correspond to jacks, rubber filler strips are arranged on the bracket, relative deflection or shearing is formed among pipe joints by using an electric synchronous jack, the deflection angle of the pipe joints is controlled by controlling the length of the extended jack, and joint sealing and stress transmission monitoring in a pipe-jacking pipe joint deflection state are carried out on the basis;
step 9, after the hoisting is finished, debugging the film pressure sensor, and respectively testing the stress and the strain under the conditions of different deflection angles of 1.0 degree, 1.5 degrees, 2.0 degrees, 2.5 degrees, 3.0 degrees and different shearing displacements of 2mm, 4mm, 6mm, 8mm and 10 mm; when the main jack applies jacking force, simulating the stress transfer characteristic between pipe joints when the pipe joints deflect due to deviation rectification in the jacking process; when the jacking force is not applied, the deflection jack extends to simulate the influence of shearing or deflection between pipe joints caused by uneven settlement on the stress of the pipe joints after construction is finished;
And in the step 4, the strain gauges and the film pressure sensors are specifically distributed in such a way that the strain gauges are arranged in the middle positions of the No. 1, 2 and 3 pipe joints, each pipe joint is provided with 8 strain gauges, a group of film pressure sensors are arranged on the section of the joint between the No. 3 pipe and the No. 2 pipe, a group of film pressure sensors are arranged on the section of the joint between the No. 2 pipe and the No. 1 pipe, and each group of film pressure sensors comprises 8 film pressure sensors.
The core purpose of the scheme is as follows: on the basis of reducing a site to the maximum extent, a full-size test model test device is designed and adopted, the tightness of a pipe joint is detected under the condition that the pipe joint bears different deflection angles and shearing displacement, the practice is guided, the deflection which the pipe joint can bear is tested, and engineering practice is served to prevent the damage of the pipe joint caused by overlarge deflection; and under the condition that the pipe joint bears different deflection angles and shearing displacement, measuring the stress and strain change conditions of the pipe joint under the deflection condition of the pipe joint by using the strain gauge and the film pressure sensor to obtain the stress transmission form between the pipe joints under the deflection condition of the pipe joint of the jacking pipe, detecting the weak part of the pipe joint to prevent damage, guiding actual engineering by using a test result, and reasonably controlling the jacking force to prevent engineering accidents such as pipe clamping, pipe joint damage, joint leakage and the like. The invention can obtain the influence on the joint sealing performance and the stress transmission among pipe joints in the deflection state of the pipe joints of the jacking pipe, serve and guide the construction of the jacking pipe under the deflection condition of the pipe joints of the jacking pipe in the ubiquitous situation, reasonably control the deflection angle and the jacking force, and prevent the occurrence of pipe jacking engineering accidents such as leakage, pipe joint damage, pipe clamping and the like.
This scheme still has other beneficial effect and characteristics in addition: 1. the model test device is a full-size pipe jacking model test device, can perform full-size tests with the diameter less than 1 meter, and can reduce the stress transfer among pipe joints of the pipe jacking pipe joint deflection and the sealing performance of the pipe joints to the maximum extent; 2. the left and right of the model test working pit are reinforced walls, the wall reinforcement is executed according to the design specification of the pipe-jacking working well, the right wall bears the reaction force of the jack, and the left wall bears the jacking force from the right main jack; carrying out foundation treatment on the bottom surface below the floor and carrying out reinforced concrete pouring on the bottom plate to prevent the influence of ground settlement on the test; designing 6 reinforced concrete bearing platforms for placing a track, embedding bolts in the bearing platforms, exposing the bolts above the bearing platforms for fixing guide rails, wherein 4 of the bolts are in one group, and 1 bearing platform is provided with two groups, so that the guide rails are horizontally laid on the bearing platforms; a gap is arranged between the bearing platforms and used for placing the deflection jack and the device joint sealing test device; 3. the steel plate is arranged on the right back wall and used for bearing the reaction force of the main jack, so that the jacking force is uniformly applied to the back wall, and the jacking force of the jack is prevented from generating uneven deformation on the back wall; 4. the jack support is used for placing jacks, so that the central positions of the two jacks are flush with the central position of the pipe joint; a jacking ring is arranged in front of the main jack, so that jacking force of the jack is uniformly applied to the pipe joints; 5. the guide rail is divided into two sections, namely a left section and a right section, and the reason for arranging the two sections is that a joint sealing test device is arranged in a reserved space at the central position of the two sections; 6. the invention adopts the deflection jacks arranged below the second pipe joint, namely the 3 rd bearing platform bracket is arranged in the middle of the 4 th bearing platform bracket, the number of the bearing platform brackets is two, and the jack jacking brackets are arranged above the jacks; 7. the position of the jacking bracket adopted by the invention corresponds to that of the jack, the upper part of the bracket is in a circular arc shape, the circular arc-shaped part is provided with the rubber filler strip which is correspondingly contacted with the pipe joint, so that the jacking force of the jack is conveniently and uniformly applied to the pipe joint, the group of jacks utilizes the electric synchronous jacks to enable the pipe joints to form relative deflection or shearing, and the deflection angle of the pipe joint is controlled by controlling the extending length of the jack; 8. the inner diameter of a steel ring adopted by the invention is 10cm larger than the outer diameter of a test pipe joint, the steel ring is sleeved on the pipe joint, a reserved hole is formed in the pipe joint in a bending mode and used for connecting an annular rubber plate and a flange plate by using an alignment bolt to form a sealing structure, and an annular clamping groove is formed in the steel ring and used for placing an annular rubber air bag and installing an annular rubber strip; the annular rubber plate is of an annular flexible structure and is used for bearing water pressure and keeping bearing extrusion without damage under the action of the water pressure; 9. the air exhaust valve is used for exhausting air of the sealing detection device, and the pressure gauge is used for maintaining the pressure of the closed space of the device and detecting whether the deflection of the pipe joint influences the sealing or not, so that the sealing performance is detected; 10. the invention adopts the thin film pressure sensor to collect the stress of the pipe joints in the jacking and deflection processes, debugs the thin film pressure sensor, debugs by using the wood gasket at the same position as the socket of the pipe joint, reduces the error of the instrument, arranges the thin film pressure sensor on the wood gasket between the pipe joints, and finishes the arrangement of the strain gauge and the thin film pressure sensor before the pipe joints are hoisted; 11. when a jack on the back wall applies jacking force, joint sealing and stress transfer characteristics between pipe joints are simulated when the pipe joints deflect due to deviation rectification in the jacking process; when the jacking force is not applied, the influence of shearing or deflection between pipe joints caused by uneven settlement on joint sealing and stress transfer characteristics is simulated after construction is completed.
Drawings
FIG. 1 is a schematic view of the arrangement of a model testing apparatus according to the present invention
FIG. 2 is a schematic top view of the rail, support jack and jacking jack arrangement of the present invention
FIG. 3 is a schematic view of a seal testing apparatus according to the present invention
FIG. 4 is a schematic view of the jacking seat of the present invention
FIG. 5 is a schematic view showing the axial arrangement of the stress strain gauge of the pipe joint of the present invention
FIG. 6 is a schematic diagram of the circumferential arrangement of the thin film pressure sensor and strain gauges according to the present invention
Description of reference numerals: 1-front back wall body, 2-test pit bottom plate, 3-bearing platform bracket, 4-left side rail, 5-right side rail, 6-pipe joint sealing test device, 7-steel plate, 8-jack bracket, 9-jacking ring, 10-main jack, 11-deflection jack, 12-jack jacking bracket, 13-pipe joint, 14-strain gauge, 15-test pit side wall, 16-rubber air bag, 17-air compressing port, 18-contraposition bolt, 19-flange plate, 20-annular rubber strip, 21-annular rubber plate, 22-air exhausting valve, 23-pressure gauge, 24-pipeline, 25-slurry pump, 26-air compressor, 27-annular cavity, 28-jack clamping groove, 29-rubber cushion strip, 30-film pressure sensor, 31-embedded bolt and 32-rigid ring.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples, and the present invention is not limited to the examples.
A monitoring device for joint sealing and stress transmission under a deflection state of a pipe joint of a jacking pipe is composed of a fixing and loading device, a joint sealing testing device and a pipe joint stress monitoring device; the fixing and loading device consists of a test pit, a guide rail, a jack bracket, a deflection jack and a main jack, wherein the test pit comprises a bottom plate, a side wall, a stress wall and a bearing platform bracket; the side wall is used as a soil retaining structure and is positioned on the side surface of the test pit; the stress wall is designed according to a calculation formula of the bearing capacity of the retaining wall and is used for bearing the jacking force reaction of the main jack, the stress wall comprises a front back wall and a back wall, and a plurality of connected pipe jacking sections are positioned between the front back wall and the back wall; bolts are embedded in the bearing platform brackets and used for fixing and limiting the guide rails, and a plurality of unconnected bearing platform brackets are arranged on a bottom plate of the test pit; the guide rail is arranged on the bearing platform bracket, the guide rail is cut off at the interface position of the first pipe-jacking pipe joint close to the front back wall and is used for installing the joint sealing test device, and the pipe-jacking pipe joint is arranged on the guide rail; the jack support is used for placing a main jack, the jack support and the main jack are positioned between a first pipe jacking pipe section close to the back wall and the back wall, and the back wall is used for bearing jacking force counter force to act on the pipe sections; the deflection jack is positioned below the pipe joint of the push pipe to be deflected and is used for deflecting the pipe joint of the push pipe; the joint sealing test device consists of a steel ring, a rubber air bag, a flange plate, an annular rubber plate, a pressure water bag, an automatic exhaust valve and a digital display pressure gauge, the steel ring is a spiral steel pipe, the inner diameter of the spiral steel pipe is larger than the outer diameter of the pipe joint of the top pipe, the inner diameter of the rubber air bag is larger than the outer diameter of the pipe joint of the top pipe, the rubber air bag is used for inflating and extruding the annular rubber strip to fix the steel ring on the pipe joint of the top pipe and keep the tightness of the tightness testing device, the flange plate is used for connecting the steel ring and the annular rubber plate into a whole, and the annular rubber plate is positioned between the two steel rings and is used as a flexible device for bearing different applied water pressures, the automatic exhaust valve is used for exhausting air in the sealing test device, and the digital display pressure gauge is used for filling water pressure into a sealing test cabin body (namely an annular cavity) filled with water and simulating the sealing performance of the pipe joint under the condition of pipe joint deflection under different grouting pressures; the stress monitoring device for the pipe joints consists of strain gauges and film pressure sensors, wherein the strain gauges are attached to the pipe joints on the inner side of the axial center of the pipeline and used for measuring the circumferential and longitudinal strains of the pipe joints and are divided into 3 sections, and a plurality of circumferential and longitudinal strain gauges are arranged on the section of the joint of each pipe joint of the jacking pipes; the film pressure sensor is attached to the wood base plate, a plurality of wood base plates and the film pressure sensors are uniformly distributed on the section of each connection part, the number of groups of the strain gauges and the film pressure sensors is the same as the number of the connection positions of the pipeline, and the strain gauges and the film pressure sensors are used for measuring the stress, strain and stress transmission of the pipeline of the pipe joint under different deflection angles and shearing displacement.
The use method of the device comprises the following steps,
(1) the joint sealing and stress transmission monitoring device under the deflection state of the pipe joint of the jacking pipe mainly comprises a model test device, a joint sealing test device and a pipe joint stress monitoring device.
(2) As shown in figure 1, the stressed wall comprises a front back wall and a back wall, the front back wall body 1 and the back wall body are used for resisting the jacking force of a jack and a pipe joint, the bottom plate 2 of the test pit is provided with 6 bearing platform brackets 3, and a left side rail 4 and a right side rail 5 are arranged on the bearing platform brackets.
(3) As shown in figure 1, the steel plate 7 is fixed on a back wall, the jack supports 8 are sequentially arranged, a main jack 10 is arranged on the jack support 8, and a jacking ring 9 is arranged on a steel rail in front of the main jack 10.
(4) The sequential arrangement of the bearing platform bracket 3, the track 4, the steel plate 7, the jack bracket 8, the main jack 10 and the jacking ring 9 is shown in fig. 2.
(5) As shown in fig. 1, after the guide rails 4 and 5 are laid, the pipe joints 13 are adjusted and installed by using a crane, and the pipe joints are hoisted on the guide rails and sequentially comprise a No. 3 pipe joint, a No. 2 pipe joint and a No. 1 pipe joint from left to right.
(6) As shown in fig. 3, before hoisting, the annular rubber strip 20, the rubber air bag 16 and the steel ring 32 on the No. 3 pipe joint and the No. 2 pipe joint are installed on the ground in place, the annular rubber plate 21 and the steel ring 32 are fixed on the No. 3 pipe joint by the flange 19 through the split bolt 18, the annular rubber plate is annular, one end of the annular rubber plate 21 is fixed on the steel ring 32 of the No. 3 pipe, and the flange 19 on the No. 2 pipe joint is preassembled on the annular rubber plate 21.
(7) As shown in fig. 1 and 3, 3 pipe joints are sequentially placed from left to right, after the placement is completed, a main jack 10 is used for pushing to enable the three pipe joints to keep a normal butt joint state, the other end of an annular rubber plate 21 is fixed on a steel ring 32 of a No. 2 pipe through a flange plate 19 on the No. 2 pipe joint, meanwhile, air is compressed through air compressing ports 17 on the No. 2 pipe joint and the No. 3 pipe joint to enable a rubber air bag 16 to expand and extrude an annular rubber strip 20, the steel ring 32 is fixed on a pipeline 13, then an exhaust valve 22, a pressure gauge 23, a slurry pump 25, a slurry pump pipeline 24 and an air compressor 26 are installed on the No. 2 pipe joint, equipment is debugged, and the installation of the sealing test device 6 is completed.
(8) As shown in fig. 1 and 4, 2 deflecting jacks 11 are placed below the number 2 pipe joint, and jack jacking brackets 12 are placed above the jacks, so that jacking force of the jacks is uniformly applied to the pipe joints.
(9) As shown in fig. 4, two jack slots 28 are provided at the lower part of the jack bracket 12 corresponding to the jacks, and a rubber filler strip 29 is disposed on the bracket. The electric synchronous jacks are utilized to enable the pipe joints to form relative deflection or shearing, the deflection angle of the pipe joints is controlled by controlling the length of the deflection jacks 11, and on the basis, joint sealing and stress transmission monitoring in the deflection state of the pipe joints of the jacking pipe are carried out.
(10) As shown in fig. 1, 5 and 6, before hoisting, the strain gauge 14 is arranged on the 3-joint pipe joint 13 on the ground, and the thin film pressure sensor 30 is arranged on the wood gasket on the two joint pipes, and after hoisting, the instrument is debugged. The strain gauge 14 is arranged on the inner side of the middle positions of the No. 1, 2 and 3 pipe joints, each pipe joint is 8, a group of film pressure sensors 30 are arranged on the section of the joint between the No. 3 pipe and the No. 2 pipe, and a group of film pressure sensors 30 are arranged on the section of the joint between the No. 2 pipe and the No. 1 pipe, wherein each group is 8. The stress and strain under different shear displacements (2mm, 4mm, 6mm, 8mm, 10mm) at different deflection angles (1.0 °, 1.5 °, 2.0 °, 2.5 °, 3.0 °) were tested separately. When the main jack 10 applies jacking force, simulating the stress transfer characteristic between pipe joints when the pipe joints deflect due to deviation rectification in the jacking process; when the jacking force is not applied, the deflection jack 11 extends to simulate the influence of shearing or deflection between pipe joints caused by uneven settlement on the stress of the pipe joints after construction is finished.
(11) As shown in fig. 1 and 3, a mud pump 25 is used to fill water into the annular cavity 27 of the seal testing device 6, the exhaust valve 22 on the pressure gauge 23 is opened, and after the air in the exhaust valve 22 is exhausted and flows out of the water, the exhaust valve 22 is closed. Filling water pressure into a sealed test cabin (namely an annular cavity) 27 filled with water by using an air compressor 26, stabilizing the pressure for 15min every time when the pressure is increased by 0.1MPa after the pressure reaches 0.1MPa, and observing the reading change of a pressure gauge 23 or whether the inner wall of a pipe joint has water leakage or not; and (4) continuing the pressure rise test after the sealing effect meets the requirement, and stopping the test when the pressure gauge 23 has larger pressure drop or water leakage.
(12) The synchronous deflection jack 11 causes the pipe joints to form relative deflection or shearing to reach a set first-stage deflection angle or shearing displacement; and then the sealing effect of the joint under the external water pressure actions of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa and 0.5MPa (different water pressure is used for simulating different grouting pressures) is tested by the filling water pressure, similarly, after the sealing effect reaches 0.1MPa, the pressure is stabilized for 15min every time when the sealing effect is increased by 0.1MPa, the judgment is carried out by observing the reading change of a pressure gauge 23 or whether the inner wall of the pipe joint has water leakage, and the test is stopped when the sealing effect does not meet the requirement.
And sequentially testing and simulating the sealing performance of the pipe joint under different conditions according to the set different deflection angles or shearing displacements, different applied jacking forces and no applied jacking force. When jacking force is applied, the sealing performance of the pipe joint and the stress transfer characteristic between pipe joints when the pipe joints deflect due to deviation rectification in the jacking process are simulated; and when the jacking force is not applied, simulating the influence of shearing or deflection between pipe joints caused by uneven settlement on the sealing effect of the pipe joint joints and the force transmission characteristic between the pipe joints after construction is finished.
Claims (4)
1. The utility model provides a sealed and atress transmission monitoring devices of joint under push pipe coupling deflection state which characterized in that: the device consists of a fixing and loading device, a joint sealing test device and a pipe joint stress monitoring device; the fixing and loading device consists of a test pit, a guide rail, a jack bracket, a deflection jack and a main jack, wherein the test pit comprises a bottom plate, a side wall, a stress wall and a bearing platform bracket; the side wall is used as a soil retaining structure and is positioned on the side surface of the test pit; the stress wall is designed according to a calculation formula of the bearing capacity of the retaining wall and is used for bearing the jacking force reaction of the main jack, the stress wall comprises a front back wall and a back wall, and a plurality of connected pipe jacking sections are positioned between the front back wall and the back wall; bolts are embedded in the bearing platform brackets and used for fixing and limiting the guide rails, and a plurality of unconnected bearing platform brackets are arranged on a bottom plate of the test pit; the guide rail is arranged on the bearing platform bracket, the guide rail is cut off at the interface position of the first pipe-jacking pipe joint close to the front back wall and is used for installing the joint sealing test device, and the pipe-jacking pipe joint is arranged on the guide rail; the jack support is used for placing a main jack, the jack support and the main jack are positioned between a first pipe jacking section close to the back wall and the back wall, and the back wall is used for bearing jacking force counter force to act on the pipe jacking sections; the deflection jack is positioned below the pipe joint of the push pipe to be deflected and is used for deflecting the pipe joint of the push pipe; the joint sealing test device consists of a steel ring, a rubber air bag, a flange plate, an annular rubber plate, a pressure water bag, an automatic exhaust valve and a digital display pressure gauge, the steel ring is a spiral steel pipe, the inner diameter of the spiral steel pipe is larger than the outer diameter of the pipe joint of the top pipe, the inner diameter of the rubber air bag is larger than the outer diameter of the pipe joint of the top pipe, the rubber air bag is used for inflating and extruding the annular rubber strip to fix the steel ring on the pipe joint of the top pipe and keep the tightness of the tightness testing device, the flange plate is used for connecting the steel ring and the annular rubber plate into a whole, and the annular rubber plate is positioned between the two steel rings and is used as a flexible device for bearing different applied water pressures, the automatic exhaust valve is used for exhausting air in the sealing test device, and the digital display pressure gauge is used for filling water pressure into the joint sealing test device filled with water and simulating the sealing performance of the pipe joint under the condition of pipe joint deflection under different grouting pressures; the pipe joint stress monitoring device consists of strain gauges and film pressure sensors, wherein annular and longitudinal strain gauges are arranged at the axial center position of the inner wall of each pipe joint of the jacking pipe and used for measuring the annular and longitudinal strains of the pipe joints of the jacking pipe; the film pressure sensors are attached to the wood base plate, a plurality of film pressure sensors are uniformly distributed on the cross section of each connection part, the number of groups of the strain gauges and the film pressure sensors is the same as that of the connection positions of the pipelines, and the strain gauges and the film pressure sensors are used for measuring the stress, strain and stress transmission of the pipelines of the pipe joints under different deflection angles and shearing displacement.
2. The pipe jacking pipe joint deflection state joint sealing and stress transmission monitoring device according to claim 1, wherein: the bottom plate adopts reinforced concrete structure, the side wall adopts the preparation of brick concrete with the crossbeam, cushion cap bracket is reinforced concrete pouring, the guide rail is steel material.
3. The method for the device of claim 1, comprising the following steps:
the method comprises the following steps that step 1, a test pit comprises a stress wall and side walls, wherein the stress wall comprises a front back wall and a back wall, the front back wall and the back wall are used for resisting the jacking force of a jack and a pipe joint, more than 3 bearing platform brackets are arranged between the front back wall and the back wall of a bottom plate of the test pit, a left track and a right track are installed on the bearing platform brackets, and the separation position of the left track and the right track is the interface position of a first pipe jacking pipe joint close to the front back wall;
step 2, fixing the steel plate on a back wall body, arranging a jack support in a space between the back wall body and the nearest bearing platform bracket, arranging a main jack on the jack support, and placing a jacking ring on a steel rail in front of the main jack;
step 3, sequentially arranging a No. 3 pipe joint, a No. 2 pipe joint and a No. 1 pipe joint from left to right, sleeving a rubber strip, a rubber air bag and a steel ring outside the No. 3 pipe joint and the No. 2 pipe joint on the ground, fixing an annular rubber plate and the steel ring on the No. 3 pipe joint by using a split bolt through a flange plate, fixing one end of the annular rubber plate on the steel ring of the No. 3 pipe joint, and then preassembling the flange plate on the No. 2 pipe joint on the annular rubber plate at the other end;
step 4, arranging strain gauges on all pipe joints on the ground, arranging a plurality of wood gaskets on the sections of the joints of the pipe joints and arranging thin film pressure sensors on the wood gaskets;
step 5, after the left side track and the right side track are laid, hoisting the pipe joint of the jacking pipe to the guide rail by using a crane;
step 6, after the placement is finished, a main jack is used for pushing to enable the three pipe joints to be in a normal butt joint state, the other end of the annular rubber plate is fixed on a steel ring of the No. 2 pipe joint through a flange plate on the No. 2 pipe joint, meanwhile, air is compressed through air compressing ports on the No. 2 pipe joint and the No. 3 pipe joint, the rubber air bag is expanded to extrude an annular rubber strip, the steel ring is fixed on the pipe joints, then an exhaust valve, a pressure gauge, a slurry pump pipeline and an air compressor are installed on the No. 2 pipe joint, equipment is debugged, and the installation of the sealing test device is finished;
step 7, placing two deflection jacks below the No. 2 pipe joint, and placing jack jacking brackets above the jacks to enable jacking force of the jacks to be uniformly applied to the pipe joints;
step 8, two jack clamping grooves are formed in the lower portion of a jack jacking bracket and correspond to jacks, rubber filler strips are arranged on the bracket, relative deflection or shearing is formed among pipe joints by using an electric synchronous jack, the deflection angle of the pipe joints is controlled by controlling the length of the extended jack, and joint sealing and stress transmission monitoring in a pipe-jacking pipe joint deflection state are carried out on the basis;
step 9, after the hoisting is finished, debugging the film pressure sensor, and respectively testing the stress and the strain under the conditions of different deflection angles of 1.0 degree, 1.5 degrees, 2.0 degrees, 2.5 degrees, 3.0 degrees and different shearing displacements of 2mm, 4mm, 6mm, 8mm and 10 mm; when the main jack applies jacking force, simulating the stress transfer characteristic between pipe joints when the pipe joints deflect due to deviation rectification in the jacking process; when the jacking force is not applied, the deflection jack extends to simulate the influence of shearing or deflection between pipe joints caused by uneven settlement on the stress of the pipe joints after construction is finished;
step 10, injecting water into an annular cavity of the sealing test device by using a slurry pump, opening an exhaust valve on a pressure gauge, closing the exhaust valve after air in the exhaust valve is exhausted and water flows out, and adding water pressure into the annular cavity filled with water by using an air compressor, stabilizing the pressure for 15min every time when the water pressure is increased by 0.1MPa after the water pressure reaches 0.1MPa, and observing the reading change of the pressure gauge or whether water leakage exists on the inner wall of a pipe joint; after the sealing effect meets the requirement, the pressure rise test is continued, and the test is stopped when a pressure gauge has larger pressure drop or water leakage occurs;
step 11, forming relative deflection or shearing between pipe joints by using a synchronous deflection jack to achieve a set first-stage deflection angle or shearing displacement; and then the sealing effect of the joint under the external water pressure action of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa and 0.5MPa is respectively tested by the filling water pressure, after the sealing effect reaches 0.1MPa, the pressure is stabilized for 15min every time when the pressure is increased by 0.1MPa, the judgment is carried out by observing the reading change of a pressure gauge or whether the inner wall of the pipe joint has water leakage, and the test is stopped when the sealing effect does not meet the requirement.
4. The method of claim 3, wherein: in the step 4, the strain gauges and the film pressure sensors are specifically distributed in such a way that the strain gauges are arranged in the middle positions of the No. 1, No. 2 and No. 3 pipe joints, each pipe joint is provided with 8 strain gauges, a group of film pressure sensors are arranged on the cross section of the joint between the No. 3 pipe and the No. 2 pipe, a group of film pressure sensors are arranged on the cross section of the joint between the No. 2 pipe and the No. 1 pipe, and each group of film pressure sensors comprises 8 film pressure sensors.
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