CN112147313A - Simulation test device for antifriction grouting of large-section rectangular jacking pipe - Google Patents
Simulation test device for antifriction grouting of large-section rectangular jacking pipe Download PDFInfo
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- CN112147313A CN112147313A CN202011126867.3A CN202011126867A CN112147313A CN 112147313 A CN112147313 A CN 112147313A CN 202011126867 A CN202011126867 A CN 202011126867A CN 112147313 A CN112147313 A CN 112147313A
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- 238000012360 testing method Methods 0.000 title claims abstract description 114
- 238000004088 simulation Methods 0.000 title claims abstract description 48
- 239000002689 soil Substances 0.000 claims abstract description 147
- 239000002002 slurry Substances 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010276 construction Methods 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 claims 1
- 230000008859 change Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008733 trauma 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention relates to a simulation test device for large-section rectangular pipe jacking antifriction grouting, which comprises: testing a soil box; a front pipe section arranged in the test soil box; model soil filled in the test soil box; a starting bracket arranged outside the test soil box; the rear pipe joint is arranged on the starting bracket and connected with the front pipe joint, a muddy water filling ring is arranged on the rear pipe joint, and a circle of grouting grooves connected with each other are formed along the periphery of the rear pipe joint; the rear leaning frame is arranged on one side, far away from the test soil box, of the rear pipe joint; and the pushing mechanism is fixedly connected to the rear leaning frame and corresponds to the rear pipe joint, the rear pipe joint is pushed by the pushing mechanism to be pushed into the test soil box, and in the process that the rear pipe joint is pushed into the test soil box, antifriction slurry is injected to the outer side of the rear pipe joint through the muddy water injection ring, so that actual pipe jacking construction is simulated. The invention utilizes the rear pipe joint to jack into the test soil box to simulate the actual pipe jacking construction, thereby providing actual guiding significance for the pipe jacking construction.
Description
Technical Field
The invention relates to the technical field of pipe jacking test devices, in particular to a simulation test device for large-section rectangular pipe jacking antifriction grouting.
Background
Pipe-jacking construction is a non-excavation construction method which is developed and applied increasingly at present, and can pass through the existing highways, railways, riverways, underground pipelines, underground structures, cultural relics and the like without excavating surface layers. The pipe-jacking construction method avoids the excavation amount of urban pavements, reduces a large amount of earthwork, reduces removal arrangement, saves construction land, reduces the interference of surrounding environment without interrupting ground pedestrian traffic and logistics transportation activities, and the like, and is widely applied to urban underground space development, underground railway track traffic construction and municipal tunnel engineering in recent years.
In the pipe jacking construction process, the jacking force of a rear oil cylinder is a vital parameter for pipe jacking construction, the jacking force is related to the resistance received by a cutter head and the frictional resistance received by the outer surface of a pipe jacking in the jacking process of a pipe jacking machine, friction reducing slurry can be injected into the outer surface of the pipe jacking by reducing the frictional resistance between the outer surface of the pipe jacking and a soil body, the frictional resistance is reduced by utilizing the friction reducing slurry, the proportion of the friction reducing slurry is generally determined through a pipe jacking simulation test, in the conventional simulation test device, the friction reducing slurry is injected into the outer surface of a pipe joint through grouting holes uniformly distributed on the pipe joint, when the slurry is injected outwards from the grouting holes, the slurry can directly impact the soil body, and is not easy to uniformly diffuse to the outer surface of the pipe joint to form a slurry sleeve, so that the error of a test result is large, and the reference value for actual construction is not high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a simulation test device for large-section rectangular jacking pipe antifriction grouting, and solves the problems that the existing jacking pipe simulation test device is provided with a grouting hole, antifriction slurry is injected into the grouting hole, the soil body is impacted, a slurry sleeve which is uniformly distributed is not easy to form, the error of a test result is larger, and the reference value of actual construction is not high.
The technical scheme for realizing the purpose is as follows:
the invention provides a simulation test device for large-section rectangular pipe jacking antifriction grouting, which comprises:
the test soil box is internally provided with an accommodating space, and two opposite sides of the test soil box are provided with corresponding holes;
the front pipe joint is arranged in the test soil box, and the pipe orifice of the front pipe joint is positioned at the corresponding hole;
model soil filled in the test soil box, wherein the model soil is used for fixedly burying the front pipe joint;
the starting bracket is arranged on the outer side of the test soil box and is arranged on one side of the test soil box with the hole;
the rear pipe joint is arranged on the starting bracket, the end part of the rear pipe joint close to the corresponding hole is connected with the front pipe joint, the rear pipe joint is provided with muddy water filling rings at intervals, and the muddy water filling rings are provided with a circle of grouting grooves which are connected along the periphery of the rear pipe joint;
the rear leaning frame is arranged on one side, far away from the test soil box, of the rear pipe joint; and
the pushing mechanism is fixedly connected with the rear leaning frame and corresponds to the rear pipe joint, the rear pipe joint is pushed to be pushed into the test soil box through the pushing mechanism, in the process that the rear pipe joint is pushed into the test soil box, friction reducing slurry is injected into the outer side of the rear pipe joint through the muddy water filling ring, and therefore actual pipe jacking construction is simulated.
According to the simulation test device, the rear pipe joint is used for jacking into the test soil box to simulate actual pipe jacking construction, the muddy water filling ring is arranged on the rear pipe joint, the muddy water filling ring forms the annular grouting groove on the outer surface of the rear pipe joint, and compared with a mode that grouting holes are uniformly distributed in the prior art, the annular grouting groove of the muddy water filling ring can enable antifriction mud to be synchronously injected into the outer surface of the pipe joint at the same pressure, the antifriction mud can be uniformly distributed on the outer surface of the pipe joint to form a uniform mud sleeve, so that the friction resistance between the antifriction mud and the pipe joint measured by the simulation test device can be more accurate, and the friction resistance can also provide practical guiding significance for the jacking force of the pipe jacking construction.
The simulation test device for the large-section rectangular pipe-jacking antifriction grouting is further improved in that the muddy water filling ring comprises an annular cavity and a grout inlet channel, wherein the annular cavity is arranged in the rear pipe joint and is arranged along the circumferential direction of the rear pipe joint;
the grouting groove is communicated with one end part of the annular cavity, and an annular grouting notch is formed in the outer surface of the rear pipe joint by the grouting groove;
the slurry inlet channel is arranged at intervals along the inner surface of the rear pipe joint and communicated with the annular cavity, and antifriction slurry is injected into the annular cavity through the slurry inlet channel, so that the injected antifriction slurry is injected into the outer side of the rear pipe joint from the slurry injection groove and the slurry injection notch after the annular cavity is filled with the antifriction slurry.
The simulation test device for the large-section rectangular pipe jacking antifriction grouting is further improved in that the arrangement direction of the grouting groove is parallel to the end face of the rear pipe piece;
the width direction of the annular cavity is perpendicular to the end face of the rear segment.
The simulation test device for the large-section rectangular jacking pipe antifriction grouting is further improved in that each slurry filling ring is independently connected with a grouting pipe so as to realize independent control of filling of antifriction slurry at each slurry filling ring.
The simulation test device for the large-section rectangular jacking pipe antifriction grouting is further improved in that the rear pipe joint and the front pipe joint are connected through a plurality of force sensors, and the force sensors are used for detecting the frictional resistance on the rear pipe joint.
The simulation test device for the large-section rectangular jacking pipe antifriction grouting is further improved in that the simulation test device further comprises a measuring plate arranged on the surface of the model soil and a displacement sensor fixedly arranged at the top of the test soil box corresponding to the measuring plate, and the displacement sensor is used for detecting the sinking and floating changes of the model soil.
The simulation test device for the large-section rectangular pipe jacking antifriction grouting is further improved in that a first soil pressure sensor is mounted on one side, close to the rear pipe joint, of the front pipe joint and used for detecting the soil body pressure of the model soil.
The simulation test device for the large-section rectangular jacking pipe antifriction grouting is further improved in that a second soil pressure sensor is arranged on the periphery of the rear pipe joint and used for detecting the soil body pressure of the model soil.
The simulation test device for the large-section rectangular pipe jacking antifriction grouting is further improved in that the front pipe joint and the rear pipe joint are of transparent structures;
and a camera is arranged in the rear pipe joint, and the camera shoots the diffusion condition of the injected friction reducing slurry through the transparent structure.
The simulation test device for the large-section rectangular jacking pipe antifriction grouting is further improved in that a support beam is supported and connected between the rear leaning frame and the test soil box.
Drawings
FIG. 1 is a schematic structural diagram of a large-section rectangular pipe jacking antifriction grouting simulation test device.
FIG. 2 is a schematic structural diagram of the large-section rectangular pipe jacking antifriction grouting simulation test device in which the rear pipe joint jacks into the test soil box.
FIG. 3 is a schematic structural diagram of a front pipe joint in the large-section rectangular pipe jacking antifriction grouting simulation test device.
FIG. 4 is a schematic structural diagram of a rear pipe joint in the large-section rectangular pipe jacking antifriction grouting simulation test device.
FIG. 5 is a cross-sectional view of the joint of the front pipe joint and the rear pipe joint in the large-section rectangular pipe jacking antifriction grouting simulation test device.
FIG. 6 is a cross-sectional view of a muddy water filling ring of a rear pipe joint in the large-section rectangular pipe jacking antifriction grouting simulation test device.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a simulation test device for large-section rectangular pipe jacking antifriction grouting, which is used for simulating an antifriction grouting process during pipe jacking and analyzing and obtaining the influence of antifriction slurry grouting on jacking force, the diffusion path of slurry grouting and the influence of different slurry proportions during pipe jacking. According to the simulation test device, the L-shaped muddy water filling ring is arranged, so that antifriction mud forms an annular mud sleeve in the pipe piece and then is filled to the outer side of the rear pipe joint through the grouting notch, an actual grouting path can be truly simulated, and the test accuracy is improved. In addition, the force transducer is used for detecting the friction resistance received in the jacking process of the rear pipe joint, the friction force between the pipe joint and the soil body is accurately obtained, the optimal proportion of the friction-reducing slurry is judged by using the friction force, the jacking force required by jacking the pipe can be determined, and effective guidance can be provided for actual construction. The invention relates to a simulation test device for large-section rectangular pipe jacking antifriction grouting, which is described below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a large-section rectangular pipe jacking antifriction grouting simulation test device is shown. Referring to fig. 6, a cross-sectional view of a mud-water filling ring of a rear pipe joint in the large-section rectangular pipe jacking antifriction grouting simulation test device is shown. The simulation test device for large-section rectangular pipe jacking antifriction grouting according to the invention is described below with reference to fig. 1 and 6.
As shown in fig. 1 and fig. 6, the simulation test device 20 for large-section rectangular pipe-jacking antifriction grouting of the present invention comprises a test soil box 21, a front pipe joint 22, a starting bracket 231, a rear pipe joint 24, a rear leaning frame 25 and a pushing mechanism 26, wherein an accommodating space 211 is formed inside the test soil box 21, and two opposite sides of the test soil box 21 are provided with corresponding holes 212; the front pipe joint 22 is placed in the test soil box 21, and the pipe orifice of the front pipe joint 22 is positioned at the corresponding hole 212; model soil is filled in the test soil box 21 and used for simulating an actual soil body, and the model soil in the test soil box 21 is buried in the front pipe joint 22; the starting bracket 231 is arranged on the outer side of the test soil box 21, and the starting bracket 231 is arranged on one side of the test soil box 21 with the hole 212; the rear pipe joint 24 is placed on the starting bracket 231, the end part of the rear pipe joint 24 close to the corresponding hole 212 is connected with the front pipe joint 22, the rear pipe joint 24 is provided with muddy water filling rings 241 at intervals, and the muddy water filling rings 241 are provided with a circle of grouting grooves 2411 along the periphery of the rear pipe joint 24; the rear leaning frame 25 is arranged on one side of the rear pipe joint 24 far away from the test soil box 21; the pushing mechanism 26 is fixedly connected to the rear back frame 25 and arranged corresponding to the rear pipe joint 24, and as shown in fig. 2, the pushing mechanism 26 pushes the rear pipe joint 24 to push the rear pipe joint 24 into the test soil box 21, and in the process that the rear pipe joint 24 is pushed into the test soil box 21, antifriction mud is injected to the outer side of the rear pipe joint 24 through the mud water injection ring 241, so that actual pipe jacking construction is simulated.
The simulation test device 20 of the invention utilizes the pushing mechanism 26 to push the rear pipe joint 24 from the outer side of the test soil box 21 to the test soil box 21, thereby realizing the simulation of actual pipe-jacking construction, the muddy water filling rings 241 are distributed on the rear pipe joint 24 at intervals, the muddy water filling rings 241 are provided with the grouting grooves 2411 which are formed in a circle at the periphery of the rear pipe joint 24, the grouting grooves 2411 can synchronously fill antifriction mud at the same pressure to the outer side of the rear pipe joint 24, the antifriction mud can be uniformly coated on the periphery of the rear pipe joint 24, and better antifriction effect is achieved. Compared with a point single grouting mode of a grouting hole in the prior art, the point single grouting mode can avoid impact on a soil body, avoid disturbance on the soil body and avoid concentration of grout near the grouting hole.
In one embodiment of the present invention, as shown in fig. 4 and 6, the mud filling ring 241 includes an annular cavity 2412 disposed inside the rear pipe joint 24 and arranged along the circumferential direction of the rear pipe joint 24, and a mud inlet passage 2413 disposed inside the rear pipe joint 24; the grouting groove 2411 is communicated with one end of the annular cavity 2412, an annular grouting notch 2414 is formed on the outer surface of the rear pipe joint 24 of the grouting groove 2411, the slurry inlet channels 2413 are arranged at intervals along the inner surface of the rear pipe joint 24, the slurry inlet channels 2413 are communicated with the annular cavity 2412, friction-reducing slurry is injected into the annular cavity 2412 through the slurry inlet channels 2413, and the injected friction-reducing slurry is injected from the grouting groove 2411 and the grouting notch 2414 to the outer side of the rear pipe joint 24 after the annular cavity 2412 is filled with the injected friction-reducing slurry.
Specifically, the slurry inlet passage 2413 communicates with the bottom of the annular cavity 2412, the slurry inlet passage 2413 extends from the bottom of the annular cavity 2412 to the inner surface of the rear pipe joint 24, the slurry inlet passage 2413 is provided with a slurry inlet at the inner surface of the rear pipe joint 24, the slurry inlet is connected with the grouting pipe 27, and the grouting pipe 27 is used for injecting friction-reducing slurry into the slurry inlet passage 2413. The grouting groove 2411 communicates with an end portion of the annular cavity 2412, the grouting groove 2411 extends from the end portion of the annular cavity 2412 toward an outer surface of the rear pipe joint 24, and the grouting groove 2411 forms an annular grouting groove 2414 on the outer surface of the rear pipe joint 24. Thus, when antifriction mud is injected, antifriction mud is injected into the slurry inlet channel 2413 through the grouting pipe 27, the antifriction mud is injected into the annular cavity 2412 from the slurry inlet channel 2413, when the annular cavity 2412 is filled with the antifriction mud, the injected antifriction mud is injected into the outer side of the rear pipe joint 24 through the grouting groove 2411 and the grouting notch 2414, the antifriction mud is diffused into the rear pipe joint 24 through the annular cavity 2412 for one circle to form a mud sleeve, and then stably enters the outer side of the rear pipe joint 24, so that the antifriction mud can be more uniformly coated on the periphery of the rear pipe joint 24.
Further, the setting direction of the grouting groove 2411 is parallel to the end surface of the rear pipe joint 24; the annular cavity 2412 is arranged in a direction perpendicular to the end surface of the rear pipe joint 24, that is, the grouting groove 2411 is vertically connected with the annular groove 2412, so that the muddy water filling ring 241 is in an L shape.
In one embodiment of the present invention, each mud-water filling ring 241 is individually connected to a grouting pipe 27 to achieve individual control of the filling of the anti-friction slurry at each mud-water filling ring 241.
Referring to fig. 4, the mud-water filling rings 241 are arranged at intervals on the rear pipe joint 24, each mud-water filling ring 241 is provided with a plurality of mud inlet channels, and each mud inlet channel is connected with the corresponding grouting pipe 27 and is used for filling friction-reducing mud into the mud-water filling ring 241. The grouting pipe 27 of each mud water filling ring 241 is controlled independently so as to realize the filling of the antifriction mud by sections.
In one embodiment of the present invention, as shown in fig. 5, the front and rear tube sections 22 and 24 are connected by a plurality of load cells 281, the load cells 281 being configured to detect the frictional resistance experienced by the rear tube section 24. The rear pipe joint 24 is pushed into the test soil box 21 by the pushing mechanism 26, the rear pipe joint 24 is pushed into the model soil of the test soil box 21 at a constant speed under the action of the pushing force of the pushing mechanism 26, and the pushing force of the pushing mechanism 26 is equal to the frictional resistance of the model soil to the rear pipe joint 24 at the moment, namely the frictional resistance on the rear pipe joint 24 is detected by the force measuring sensor 281.
Further, when the anti-friction slurry is injected to the outside of the rear pipe joint 24, the anti-friction slurry covers the outer periphery of the rear pipe joint 24, and the force detected by the load cell 281 is the frictional resistance between the anti-friction slurry and the rear pipe joint 24.
The force sensor 281 can accurately obtain the friction resistance between the rear pipe joint and the model soil or the antifriction slurry, provides a basis for selecting the antifriction slurry with any proportion, and also provides reference data for the jacking force of pipe jacking construction.
Further, as shown in fig. 3 and 4, the inner side of the front pipe joint 22 is provided with a first connecting plate 221, and the first connecting plate 221 is arranged near the pipe orifice of the front pipe joint 22; inside the rear tube section 24, a second connecting plate 242 is provided, the second connecting plate 242 being disposed near the end of the rear tube section 24, the second connecting plate 242 being disposed in correspondence with the first connecting plate 221, and as shown in fig. 5, the load cell 281 is installed between the first connecting plate 221 and the second connecting plate 242 and is fixedly connected to the first connecting plate and the second connecting plate 242. Preferably, there are four first connecting plates 221 and four second connecting plates 242, which are respectively disposed at the corners of the pipe joint, and correspondingly, there are four load cells 281.
The rear pipe joint 24 is connected with the front pipe joint 22 through the load cell 281, so that the top thrust applied by the pushing mechanism 26 on the rear pipe joint 24 is completely transmitted to the front pipe joint 22 through the load cell 281, so that the rear pipe joint 24 and the front pipe joint 22 move forward together, the rear pipe joint 24 enters the test soil box 21, the front end of the front pipe joint 22 extends out of the hole 212 of the test soil box 21, and the top thrust is not transmitted to other structures by the front pipe joint 22, so that when the rear pipe joint 24 is pushed in at a constant speed, the top thrust detected by the load cell 281 is completely used for offsetting the friction resistance of the pipe joints, namely the friction resistance is equal to the top thrust.
Preferably, the load cell 281 is a model S FC-TJ01 Standard available from Shanghai trauma testing technology, Inc.
In one embodiment of the present invention, as shown in fig. 1 and 2, the simulation test apparatus 20 further includes a measuring plate 283 disposed on the surface of the model soil and a displacement sensor 282 fixed on the top of the test soil box 21 corresponding to the measuring plate 283, and the displacement sensor 282 is used to detect the variation of the model soil in the state of sinking and floating.
When the model soil is filled in the test soil box 21, the model soil needs to be compacted in layers, and the surface of the model soil is a flat surface. In the process of jacking the rear pipe joint 24, model soil is influenced by jacking of the rear pipe joint 24 and is subjected to sinking and floating change, and in addition, when antifriction mud is injected to the outer side of the rear pipe joint 24, the model soil is also influenced and is subjected to sinking and floating change. The measurement plate 283 provided on the model soil surface is used to generate a change in the elevation along with the model soil surface, and the displacement sensor 282 can detect the distance information between the measurement plate 283 and the displacement sensor, so that the change in the elevation of the model soil can be obtained as compared with the distance information before the model soil is not changed.
Preferably, a plurality of mounting beams 214 are erected on the top of the test soil box 21, and the displacement sensor 282 is mounted and fixed on the mounting beams 214. The number of the measuring plates 283 and the number of the displacement sensors 282 are plural, the measuring plates 283 are arrayed on the surface of the model soil, and the sinking and floating changes of the surface of the model soil are detected by the plurality of displacement sensors 282, so that the influences of jacking of the rear pipe joint 24 and filling of antifriction mud on the model soil are obtained.
In one embodiment of the present invention, as shown in fig. 3, a first soil pressure sensor 284 is installed on one side of the front pipe joint 22 close to the rear pipe joint 24, and the first soil pressure sensor 284 is used to detect the soil pressure of the model soil. The first soil pressure sensors 284 are arranged on the outer surface of the front pipe joint 22 and are arranged at intervals along the periphery of the front pipe joint 22, the first soil pressure sensors 284 are in contact with the model soil, and when the front pipe joint 22 moves forwards in the model soil, the first soil pressure sensors 284 can detect the soil pressure, so that the soil pressure is detected in real time by the first soil pressure sensors 284 in the jacking process of the rear pipe joint 24, and the change of the soil pressure is obtained.
In an embodiment of the present invention, as shown in fig. 4, a second soil pressure sensor 285 is provided at the outer circumference of the rear pipe joint 24, and the second soil pressure sensor 285 is used for detecting the soil pressure of the model soil. The second soil pressure sensors 285 are arranged at intervals along the periphery of the rear pipe section 24, and the second soil pressure sensors 285 are arranged on the outer surface of the rear pipe section 24, so that when the rear pipe section 24 is jacked into the model soil, the second soil pressure sensors 285 can detect the soil pressure at the rear pipe section 24, and the soil pressure change in the whole jacking process is obtained.
When the antifriction mud is filled, the first soil pressure sensor and the second soil pressure sensor are used for detecting the change condition of the soil body pressure in the process of filling the mud.
In one embodiment of the present invention, as shown in fig. 1 and 2, the front and rear tube segments 22 and 24 are both transparent structures; a camera is arranged in the rear pipe joint 24, and the camera shoots the diffusion condition of the injected friction reducing slurry through a transparent structure.
Specifically, the front pipe joint 22 and the rear pipe joint 24 are made of acrylic materials, the front pipe joint 22 and the rear pipe joint 24 are transparent, the perspective function is achieved, and the condition outside the pipe joints can be observed inside the pipe joints. By means of a camera arranged inside the rear pipe joint 24, the condition of the antifriction mud outside the rear pipe joint 24 is photographed, the condition of the whole diffusion process of the antifriction mud can be obtained, and the flow characteristic of the antifriction mud can be further analyzed and obtained.
In one embodiment of the present invention, as shown in fig. 1 and 2, a support beam 251 is supported and connected between the reclining frame 25 and the test soil box 21. The support beams 251 are provided with a plurality of beams, so that the firm stability of the reclining frame 25 is improved by the support beams 251, and the stable reclining is provided for the thrusting mechanism 26.
Furthermore, the bottom of the reclining frame 25 is also provided with a diagonal brace.
Preferably, the pushing mechanism 26 is an electric cylinder. As shown in fig. 4, the rear end of the rear pipe joint 24 is provided with a force transmission frame 243, the force transmission frame 243 is connected to the telescopic rod of the electric cylinder, and the electric cylinder extends forward out of the telescopic rod, so as to push the rear pipe joint 24 forward through the force transmission frame 243.
The test soil box 21 is a square box body having a top opening 213, and model soil is filled from the top opening 213. When the simulation test device 20 is installed, the test soil box 21 is assembled, and then the model soil is filled into the test soil box 21 through the top opening 213 and compacted in layers. When the model soil is filled to the holes 212 on the front side and the rear side, stopping filling the model soil, penetrating the front pipe joint 22 into the test soil box 21 and placing the front pipe joint on the model soil, wherein the pipe orifice of the front pipe joint 22 corresponds to the corresponding hole 212, and sealing the gap between the hole 212 and the pipe orifice of the front pipe joint 22 at the hole 212 by using a sealing structure, so that the model soil is prevented from being left on one hand, and the seepage of antifriction mud in the subsequent test process is avoided on the other hand. Then, model soil is filled into the test soil box 21 and compacted in a layered manner, and the elevation of the model soil is determined according to the burying of the jacking pipes. A receiving bracket 232 is placed on the front side of the test soil box 21, and the front pipe joint 22 pushed out from the front opening 212 is supported by the receiving bracket 232. In order not to affect the frictional resistance detected by the load cell, a freely rotatable roller is provided on the top of the receiving bracket 232, and the front pipe joint 22 is supported by the roller, so that the roller can be rotated to reduce the frictional resistance with the front pipe joint 22 when the front pipe joint 22 is moved forward. Similarly, a plurality of freely rotatable rollers are also provided on the top of the origination bracket 231, the rear pipe section 24 is supported by the rollers, and the friction resistance of the rear pipe section 24 with the rear pipe section 24 is reduced by the rolling of the rollers on the origination bracket 231 when the rear pipe section 24 moves forward.
As shown in fig. 1 and 2, the simulation test device 20 of the present invention can simulate actual pipe jacking construction, the pushing mechanism 26 can push the rear pipe joint 24 into the test soil box 21 at a constant speed, in the pushing process, slurry can be injected to the outer side of the rear pipe joint 24 through the grouting pipe, and grouting parameters of the antifriction slurry can be controlled in a segmented manner, wherein the grouting parameters include grouting pressure and grouting amount. In the filling process of the antifriction mud, the pressure change of the soil body at the periphery of the pipe joint can be obtained through the first soil pressure sensor and the second soil pressure sensor, the sinking and floating change of the surface of the model soil can be obtained through the displacement sensor, the diffusion condition of the injected antifriction mud can be obtained through the camera, and the friction resistance can be accurately measured through the force measuring sensor.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. The utility model provides a large cross section rectangle push pipe antifriction slip casting's analogue test device which characterized in that includes:
the test soil box is internally provided with an accommodating space, and two opposite sides of the test soil box are provided with corresponding holes;
the front pipe joint is arranged in the test soil box, and the pipe orifice of the front pipe joint is positioned at the corresponding hole;
model soil filled in the test soil box, wherein the model soil is used for fixedly burying the front pipe joint;
the starting bracket is arranged on the outer side of the test soil box and is arranged on one side of the test soil box with the hole;
the rear pipe joint is arranged on the starting bracket, the end part of the rear pipe joint close to the corresponding hole is connected with the front pipe joint, the rear pipe joint is provided with muddy water filling rings at intervals, and the muddy water filling rings are provided with a circle of grouting grooves which are connected along the periphery of the rear pipe joint;
the rear leaning frame is arranged on one side, far away from the test soil box, of the rear pipe joint; and
the pushing mechanism is fixedly connected with the rear leaning frame and corresponds to the rear pipe joint, the rear pipe joint is pushed to be pushed into the test soil box through the pushing mechanism, in the process that the rear pipe joint is pushed into the test soil box, friction reducing slurry is injected into the outer side of the rear pipe joint through the muddy water filling ring, and therefore actual pipe jacking construction is simulated.
2. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that the slurry filling ring further comprises an annular cavity arranged in the rear pipe joint and arranged along the circumferential direction of the rear pipe joint and a slurry inlet channel arranged at the inner side of the rear pipe joint;
the grouting groove is communicated with one end part of the annular cavity, and an annular grouting notch is formed in the outer surface of the rear pipe joint by the grouting groove;
the slurry inlet channel is arranged at intervals along the inner surface of the rear pipe joint and communicated with the annular cavity, and antifriction slurry is injected into the annular cavity through the slurry inlet channel, so that the injected antifriction slurry is injected into the outer side of the rear pipe joint from the slurry injection groove and the slurry injection notch after the annular cavity is filled with the antifriction slurry.
3. The simulation test device for large-section rectangular pipe jacking antifriction grouting according to claim 2, characterized in that the arrangement direction of the grouting groove is parallel to the end face of the rear segment;
the width direction of the annular cavity is perpendicular to the end face of the rear segment.
4. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that each slurry filling ring is independently connected with a grouting pipe to realize independent control of filling antifriction slurry at each slurry filling ring.
5. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that the rear pipe joint and the front pipe joint are connected by a plurality of load cells, and the load cells are used for detecting frictional resistance received by the rear pipe joint.
6. The large-section rectangular pipe jacking anti-friction grouting simulation test device according to claim 1, further comprising a measurement plate arranged on the surface of the model soil and a displacement sensor fixedly arranged at the top of the test soil box corresponding to the measurement plate, wherein the displacement sensor is used for detecting the sinking and floating changes of the model soil.
7. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that a first soil pressure sensor is installed on one side of the front pipe joint close to the rear pipe joint, and the first soil pressure sensor is used for detecting the soil body pressure of the model soil.
8. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that a second soil pressure sensor is arranged on the periphery of the rear pipe section, and the second soil pressure sensor is used for detecting the soil body pressure of the model soil.
9. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that the front pipe joint and the rear pipe joint are transparent structures;
and a camera is arranged in the rear pipe joint, and the camera shoots the diffusion condition of the injected friction reducing slurry through the transparent structure.
10. The large-section rectangular pipe jacking antifriction grouting simulation test device according to claim 1, characterized in that a support beam is supported and connected between the rear leaning frame and the test soil box.
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|---|---|---|---|
| CN202011126867.3A CN112147313A (en) | 2020-10-20 | 2020-10-20 | Simulation test device for antifriction grouting of large-section rectangular jacking pipe |
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| CN202011126867.3A CN112147313A (en) | 2020-10-20 | 2020-10-20 | Simulation test device for antifriction grouting of large-section rectangular jacking pipe |
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| CN202011126867.3A Pending CN112147313A (en) | 2020-10-20 | 2020-10-20 | Simulation test device for antifriction grouting of large-section rectangular jacking pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113029939A (en) * | 2021-03-16 | 2021-06-25 | 北京市政建设集团有限责任公司 | Pipe jacking tunnel scale-down test device and method |
| CN113551968A (en) * | 2021-07-24 | 2021-10-26 | 西安理工大学 | Preparation method of pipe jacking structure and surrounding rock soil body model forming device |
| CN113607633A (en) * | 2021-07-24 | 2021-11-05 | 西安理工大学 | Device and method for measuring resistance reduction performance of pipe jacking slurry sleeve under condition of axisymmetric stress |
| CN116718523A (en) * | 2023-08-09 | 2023-09-08 | 长江三峡集团实业发展(北京)有限公司 | Push pipe Zhou Nijiang distribution test device and test method |
| CN116718522A (en) * | 2023-08-09 | 2023-09-08 | 长江三峡集团实业发展(北京)有限公司 | Test device for measuring circumferential stress of pipe jacking pipe and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113029939A (en) * | 2021-03-16 | 2021-06-25 | 北京市政建设集团有限责任公司 | Pipe jacking tunnel scale-down test device and method |
| CN113029939B (en) * | 2021-03-16 | 2023-02-03 | 北京市政建设集团有限责任公司 | Pipe jacking tunnel scale-down test device and method |
| CN113551968A (en) * | 2021-07-24 | 2021-10-26 | 西安理工大学 | Preparation method of pipe jacking structure and surrounding rock soil body model forming device |
| CN113607633A (en) * | 2021-07-24 | 2021-11-05 | 西安理工大学 | Device and method for measuring resistance reduction performance of pipe jacking slurry sleeve under condition of axisymmetric stress |
| CN113607633B (en) * | 2021-07-24 | 2024-04-26 | 西安理工大学 | Device and method for measuring drag reduction performance of pipe jacking mud sleeve under axisymmetric stress condition |
| CN116718523A (en) * | 2023-08-09 | 2023-09-08 | 长江三峡集团实业发展(北京)有限公司 | Push pipe Zhou Nijiang distribution test device and test method |
| CN116718522A (en) * | 2023-08-09 | 2023-09-08 | 长江三峡集团实业发展(北京)有限公司 | Test device for measuring circumferential stress of pipe jacking pipe and use method |
| CN116718522B (en) * | 2023-08-09 | 2023-10-20 | 长江三峡集团实业发展(北京)有限公司 | Test device for measuring circumferential stress of pipe jacking pipe and use method |
| CN116718523B (en) * | 2023-08-09 | 2024-01-05 | 长江三峡集团实业发展(北京)有限公司 | Distribution test method for push pipe Zhou Nijiang |
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