CN115369933A - Comparison and selection test model for side grouting mode of post grouting pile - Google Patents
Comparison and selection test model for side grouting mode of post grouting pile Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 239000011440 grout Substances 0.000 claims abstract description 54
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 238000006073 displacement reaction Methods 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 21
- 238000003860 storage Methods 0.000 claims abstract description 19
- 238000012800 visualization Methods 0.000 claims abstract description 11
- 238000009792 diffusion process Methods 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 26
- 239000004927 clay Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 description 18
- 239000007788 liquid Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 230000000007 visual effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention relates to a post-grouting pile side grouting mode comparison and selection test model which comprises a first box body and a second box body, wherein a first cast-in-place pile is embedded in the first box body; a second filling pile is embedded in the second box body; the first cast-in-place pile is provided with a straight pipe grouting pipe, and the straight pipe grouting pipe is provided with a first grout outlet; the second cast-in-place pile is provided with an annular grouting pipe, and a second grout outlet is formed in the circumferential direction of the annular grouting pipe; the annular grouting pipe comprises a guide pipe, and the guide pipe is communicated with the slurry storage tank; a first flow sensor is distributed around the first cast-in-place pile; a second flow sensor is distributed around the second cast-in-place pile; the loading mechanism respectively applies vertical loads to the first cast-in-place pile and the second cast-in-place pile; the first pressure sensor, the second pressure sensor, the first displacement sensor, the second displacement sensor, the data acquisition device and the controller are in control connection with the data acquisition device; the visualization platform comprises a comparison and selection test three-dimensional model, and the cement slurry diffusion condition is displayed on the comparison and selection test three-dimensional model.
Description
Technical Field
The invention belongs to the technical field of pile foundation post-grouting modes, and particularly relates to a post-grouting pile side grouting mode comparison and selection test model.
Background
The pile foundation is a common foundation form and is widely applied to civil engineering, high-speed railways, expressways, urban municipal bridges, ports and docks, large buildings and other engineering. The cast-in-place pile generally adopts post-grouting technology, which mainly aims to improve the defects of the construction process, improve the bearing capacity of the pile foundation and reduce the settlement, so that the pile length can be designed occasionally and the construction cost is saved. The arrangement mode of the post grouting pipeline mainly comprises a straight pipe distribution type and an annular pipe type.
The grouting pipe comprises two plugging units which are arranged at intervals up and down, and the plugging units plug the grouting pipe at the upper side and the lower side of the grout outlet, so that cement slurry entering from the grouting pipe can only flow out of the grout outlet to form pile side grouting; the annular pipe type is that the grouting pipe is annular in the circumferential direction of the cast-in-place pile, the annular grouting pipe comprises a guide pipe extending in the vertical direction, cement slurry enters the annular grouting pipe from the guide pipe and then is discharged from a slurry outlet of the annular grouting pipe, and the annular grouting pipe can be vertically arranged at intervals in the length direction of the cast-in-place pile. However, in actual construction, in the pile side grouting method of a cast-in-place pile, the penetration rate and bearing capacity of slurry under the same conditions of straight pipe type distribution and annular pipe type cannot be accurately known, and the pile side grouting method is troubled in construction.
Disclosure of Invention
In view of the above, the present invention is directed to provide a post-grouting pile side grouting manner comparison test model, so as to solve the technical problem in the prior art that it is difficult to select a pile side grouting manner of a cast-in-place pile.
In order to achieve the purpose, the technical scheme adopted by the post-grouting pile side grouting mode comparison test model is as follows:
the side grouting mode comparison test model of the post grouting pile comprises the following steps:
a first box body: the test soil body is filled in the box body, a first cast-in-place pile extending along the vertical direction is embedded in the middle of the first box body, and the test soil body is exposed out of the top of the first cast-in-place pile;
a second box body: the test soil is filled in the second box body, the test soil filled in the second box body is the same as the test soil filled in the first box body, a second filling pile extending along the vertical direction is embedded in the middle of the first box body, and the test soil is exposed out of the top of the second filling pile;
a plurality of straight pipe grouting pipes are uniformly distributed in the circumferential direction of the first cast-in-place pile, a plurality of first grout outlets are formed in the straight pipe grouting pipes at intervals in the up-down direction, and the straight pipe grouting pipes are internally provided with cast-in-place pipes which are communicated with a grout storage tank;
a plurality of annular grouting pipes are arranged at intervals along the up-down direction of the second cast-in-place pile, and the number of the annular grouting pipes is consistent with that of the first grout outlets of the straight pipe grouting pipes in the up-down direction; second grout outlets are formed in the circumferential direction of the annular grouting pipe, and the number of the second grout outlets is consistent with that of the straight grouting pipes; the annular grouting pipe comprises a guide pipe extending along the vertical direction, and the guide pipe is communicated with the slurry storage tank;
a plurality of first flow sensors are distributed around the first cast-in-place pile and used for detecting cement paste flow point positions around the first cast-in-place pile;
a plurality of second flow sensors are distributed around the second cast-in-place pile, and the second flow sensors are used for detecting cement paste flow points around the second cast-in-place pile;
a loading mechanism: the loading mechanism is arranged above the first box body and the second box body and is used for applying vertical loads to the first cast-in-place pile and the second cast-in-place pile respectively;
a first pressure sensor: the first cast-in-place pile is arranged at the top of the first cast-in-place pile;
a second pressure sensor: the second cast-in-place pile is arranged at the top of the second cast-in-place pile;
a first displacement sensor: the first cast-in-place pile detection device is fixed at the top of the first box body and used for detecting the downward movement distance of the first cast-in-place pile;
a second displacement sensor: the second cast-in-place pile detection device is fixed at the top of the second box body and used for detecting the downward movement distance of the second cast-in-place pile;
a data acquisition device: the first flow sensor and the second flow sensor are respectively connected in a control way;
a controller: the controller is connected with the data acquisition device in a control way, and is also connected with the first pressure sensor and the second pressure sensor in a control way respectively;
a visualization platform: the controller transmits data detected by the first flow sensor and the second flow sensor to the comparison and selection test three-dimensional model so as to display the diffusion condition of cement paste on the comparison and selection test three-dimensional model; and the controller transmits the data detected by the first pressure sensor, the second pressure sensor, the first displacement sensor and the second displacement sensor to the comparison and selection test three-dimensional model so as to display the loading and displacement conditions of the first cast-in-place pile and the second cast-in-place pile.
Has the advantages that: according to the post-grouting pile side grouting mode comparison and selection test model, a plurality of first flow sensors are distributed around a first grouting pile, and the first flow sensors are used for detecting cement paste flow points around the first grouting pile; a plurality of second flow sensors are distributed around the second cast-in-place pile, and the second flow sensors are used for detecting cement paste flow points around the second cast-in-place pile; the circumferential cement slurry flow condition of the first cast-in-place pile is transmitted to the data acquisition device through the first flow sensor, transmitted to the controller through the data acquisition device, transmitted to the comparison and selection test three-dimensional model in the visual platform through the controller, and displayed through the visual platform; the circumferential cement slurry flowing condition of the second cast-in-place pile is transmitted to the data acquisition device through the second flow sensor, and is transmitted to the controller through the data acquisition device, the data is transmitted to the comparison and selection test three-dimensional model in the visual platform through the controller, and the circumferential cement slurry flowing condition of the second cast-in-place pile is displayed through the visual platform, so that the visualization of the rear grouting slurry diffusion and seepage condition is realized. Moreover, loading mechanism's setting can push down the loading to first bored concrete pile and second bored concrete pile simultaneously, can realize detecting the loading and the displacement condition of first bored concrete pile and second bored concrete pile respectively through first pressure sensor, second pressure sensor, first displacement sensor, second displacement sensor to will show on visual platform. Moreover, the straight pipe distribution type and the annular pipe type in the post grouting are compared and selected, so that the consistency of test conditions in the two post grouting modes can be realized, and the comparison is more visual.
Furthermore, the first flow sensor comprises a first layer of flow sensors and a second layer of flow sensors, the first layer of flow sensors are arranged on the cylindrical surface of the radial outer side of the first cast-in-place pile, the first layer of flow sensors comprise flow sensor rings which are arranged at intervals from top to bottom and are distributed in a circular manner, and the flow sensor rings comprise a plurality of flow sensors which are uniformly distributed along the circumferential direction of the first cast-in-place pile; the second flow sensor is arranged on a cylindrical surface on the radial outer side of the first cast-in-place pile, the cylindrical surface on which the second flow sensor is arranged is coaxial with the cylindrical surface on which the first flow sensor is arranged, the cylindrical surface on which the second flow sensor is arranged is positioned on the radial outer side of the cylindrical surface on which the first flow sensor is arranged, the second flow sensor comprises flow sensor rings which are arranged at intervals up and down and are distributed circularly, and the flow sensor rings comprise a plurality of flow sensors which are uniformly distributed along the circumferential direction of the first cast-in-place pile; the circumferential arrangement form of the second flow sensors on the second cast-in-place pile is the same as the circumferential arrangement form of the first flow sensors on the first cast-in-place pile.
Has the advantages that: the arrangement of the first flow sensor and the second flow sensor can comprehensively and three-dimensionally detect the diffusion and seepage dynamics of the cement slurry in the circumferential directions of the first cast-in-place pile and the second cast-in-place pile.
Furthermore, a plurality of first long cylinders are arranged in the first box body, and leads of the first flow sensor are collected in the first long cylinders and are in control connection with the data acquisition device; and a plurality of second long cylinders are arranged in the second box body, and leads of the second flow sensor are collected in the second long cylinders and are in control connection with the data acquisition device.
Has the advantages that: the setting of first long section of thick bamboo and the long section of thick bamboo of second can be respectively to the wire of first flow sensor and second flow sensor gather the set to make first flow sensor and second flow sensor's distribution wire cleaner and tidier, also guaranteed the accuracy of each first flow sensor and second flow sensor's data transmission.
The loading mechanism comprises a first supporting rod fixed on the first box body and a second supporting rod fixed on the second box body, a first transverse plate and a second transverse plate are fixed between the first supporting rod and the second supporting rod, the first transverse plate and the second transverse plate are arranged at intervals up and down, a lead screw is rotatably arranged between the first transverse plate and the second transverse plate, a nut is matched with the upper thread of the lead screw, a first connecting rod and a second connecting rod are fixedly connected onto the nut, the first connecting rod and the second connecting rod are symmetrically arranged relative to the lead screw, one end, away from the nut, of the first connecting rod is in guiding sliding fit with the first supporting rod, one end, away from the nut, of the second connecting rod is in guiding sliding fit with the second supporting rod, a first jacking rod is fixed onto the first connecting rod, a second jacking rod is fixed onto the second connecting rod, and a first guide hole and a second guide hole which are respectively in guiding sliding fit with the first jacking rod and the second jacking rod are formed in the second transverse plate.
Has the beneficial effects that: the loading mechanism is arranged to load the first cast-in-place pile and the second cast-in-place pile simultaneously, and the loading of the first cast-in-place pile and the loading of the second cast-in-place pile at the same time can be equal.
Furthermore, a first guide long groove is formed in one side, facing the screw rod, of the first supporting rod, and the end part of the first connecting rod is in guide sliding fit with the first guide long groove; a second guide long groove is formed in one side, facing the screw rod, of the second support rod, and the end of the second connecting rod is in guide sliding fit with the second guide long groove; and the first transverse plate is provided with a driving device in transmission connection with the lead screw.
Has the advantages that: the arrangement of the first guide long groove and the second guide long groove can respectively realize the guide of the first support rod and the guide of the second support rod.
The test soil body includes clay layer, coarse sand layer and metalling from the top down in proper order, first bored concrete pile and second bored concrete pile are located the clay layer respectively.
Has the advantages that: the test soil body can be more fit with the construction conditions of the cast-in-place pile.
The other side of the slurry storage tank is communicated with an air compressor, the slurry storage tank is connected with a first slurry distributor through a first pipeline, and the first slurry distributor is respectively communicated with the filling pipes in the straight pipe grouting pipes; the slurry storage tank is connected with a second slurry distributor through a second pipeline, and the second slurry distributor is respectively communicated with the guide pipes of the annular grouting pipes.
Has the advantages that: the slurry distributor can equalize the slurry entering each pouring pipe and can control whether the slurry enters the guide pipe of the annular pouring pipe or not.
The end part of the filling pipe is provided with a first electromagnetic flowmeter and a first pressure sensor, a second electromagnetic flowmeter and a second pressure sensor are arranged at a second grout outlet of each annular filling pipe, and the first electromagnetic flowmeter, the first pressure sensor, the second electromagnetic flowmeter and the second pressure sensor are respectively in control connection with the controller.
Has the advantages that: the first pressure sensor is used for measuring the pressure of grout at the end part of the filling pipe, and the first electromagnetic flowmeter is used for measuring the flow of grout at the end part of the filling pipe; the second pressure sensor is used for measuring the pressure at the second grout outlet of the annular grouting pipe, and the second electromagnetic flowmeter is used for measuring the flow at the second grout outlet of the annular grouting pipe, so that the statistics on the pressure and the flow of the cement paste of the post grouting of two forms is facilitated, and reference data can be provided for actual application work.
Drawings
FIG. 1 is a schematic structural diagram of a post-grouting pile side grouting mode comparison test model of the invention;
FIG. 2 is a schematic structural diagram of a first box of a post-grouting pile side grouting mode comparison test model in FIG. 1;
FIG. 3 is a schematic structural diagram of a second box of the post-grouting pile side grouting mode comparison test model in FIG. 1;
FIG. 4 is a partial cross-sectional view of the first case of FIG. 2;
fig. 5 is a partial sectional view of the second casing in fig. 3.
Reference numerals are as follows: 1-a first box; 2-a second box body; 3-a first cast-in-place pile; 4-a second cast-in-place pile; 5-a first long cylinder; 6-a second long cylinder; 7-a first support bar; 8-a second support bar; 9-a first transverse plate; 10-a second transverse plate; 11-a drive motor; 12-a retarder; 13-a lead screw; 14-a first connecting rod; 15-a second connecting rod; 16-an air compressor; 17-a slurry storage tank; 18-a data acquisition device; 19-a controller; 20-a visualization platform; 21-a crushed stone layer; 22-coarse sand layer; 23-clay layer; 24-a first flow sensor; 25-straight tube grouting pipe; 26-a first displacement sensor; 27-a second flow sensor; 28-ring grouting pipe; 29-a guide tube; 30-second displacement sensor.
Detailed Description
The post-grouting pile side grouting mode comparison test model of the invention is further described in detail with reference to the accompanying drawings and the specific implementation mode:
as shown in fig. 1, the post-grouting pile side grouting mode comparison test model of the invention comprises a first box body 1, a test soil body is filled in the first box body 1, a first cast-in-place pile 3 extending along the up-down direction is embedded in the middle of the first box body 1, and the test soil body is exposed out of the top of the first cast-in-place pile 3; the second box body 2 is filled with a test soil body, a second filling pile 4 extending along the vertical direction is buried in the middle of the second box body 2, and the test soil body is exposed at the top of the second filling pile 4. In this embodiment, the test soil in the first box 1 is the same as the test soil in the second box 2, the test soil sequentially includes a clay layer 23, a coarse sand layer 22 and a gravel layer 21 from top to bottom, the height of the boundary between the clay layer 23 and the coarse sand layer 22 in the first box 1 is the same as the height of the boundary between the clay layer 23 and the coarse sand layer 22 in the second box 2, and the height of the boundary between the coarse sand layer 22 and the gravel layer 21 in the first box 1 is the same as the height of the boundary between the coarse sand layer 22 and the gravel layer 21 in the second box 2. In this embodiment, the first cast-in-place pile 3 and the second cast-in-place pile 4 are respectively located in the clay layer 23, and the first cast-in-place pile 3 and the second cast-in-place pile 4 are both model piles, and the first cast-in-place pile 3 and the second cast-in-place pile 4 are both made of the same material and have the same size. In the comparison test model of the present invention, the structural dimensions of the first box 1, the second box 2, the first cast-in-place pile 3, the second cast-in-place pile 4, and the like are all reduced by the same scale as those of the conventional construction.
First bored concrete pile 3's circumference equipartition has a plurality of straight tube slip casting pipes 25, and in this embodiment, straight tube slip casting pipe 25 is provided with two, and two straight tube slip casting pipes 25 are 180 and lay on first bored concrete pile 3 terminal surfaces, and a plurality of first grout outlets have been seted up along the upper and lower direction interval to straight tube slip casting pipe 25, and in this embodiment, every straight tube slip casting pipe 25 has seted up four first grout outlets along the upper and lower direction interval, and the distance between two adjacent first grout outlets equals. Be provided with the filling tube in the straight tube slip casting pipe 25, the filling tube includes the shutoff unit that two upper and lower intervals set up, and the shutoff unit that two upper and lower intervals set up carries out the shutoff in the upper and lower both sides of first grout outlet respectively to straight tube slip casting pipe 25, and the filling tube sets up with storage thick liquid tank 17 intercommunication to can be through storage thick liquid tank 17 to the filling tube slip casting that pours into, the grout in the filling tube flows from first grout outlet. In this embodiment, grout is carried to the grout pipe in two straight tube slip casting pipes 25 simultaneously to, when carrying out pile side back mud jacking, from up grouting in proper order down along straight tube slip casting pipe 25. In this embodiment, a device that performs post-grouting by using a straight grouting pipe belongs to the prior art, and structures of a plugging unit, a grouting pipe and the like in the device belong to the prior art, which are not described herein again.
A plurality of annular grouting pipes 28 are arranged at intervals along the up-down direction of the second cast-in-place pile 4, the number of the annular grouting pipes 28 is consistent with the number of the first grout outlets of the straight pipe grouting pipes 25 along the up-down direction, in the embodiment, four annular grouting pipes 28 are arranged at intervals along the up-down direction of the second cast-in-place pile 4, and the distance between every two adjacent annular grouting pipes 28 is equal; the second grout outlet has been seted up to annular slip casting 28 circumference, and the quantity of second grout outlet is unanimous with the quantity of straight tube slip casting 25, and two second grout outlets have been seted up to annular slip casting 28 circumference in this embodiment, and two second grout outlets are 180 and lay in the circumference of second bored concrete pile 4. In this way, the arrangement of the first grout outlet of first cast-in-place pile 3 for pile side post grouting is the same as the arrangement of the second grout outlet of second cast-in-place pile 4 for pile side post grouting, and not only the number is the same, but also the positions of the grout outlets relative to the cast-in-place piles are the same. Each annular grouting pipe 28 includes a guide pipe 29 extending in the up-down direction, and the guide pipe 29 is provided in communication with the grout tank 17. When the pile side post grouting is performed, the lower annular grouting pipe 28 is grouted first, then the upper annular grouting pipe 28 is grouted in sequence, and the pile side post grouting is performed in sequence from bottom to top corresponding to the second cast-in-place pile 4. In this embodiment, the device for performing post grouting by using the annular grouting pipe belongs to the prior art, and the structures of the annular grouting pipes all belong to the prior art and are not described herein again.
A plurality of first flow sensors 24 are distributed in the test soil around the first cast-in-place pile 3, and the first flow sensors 24 are used for detecting the flow points of cement paste around the first cast-in-place pile 3; in this embodiment, each first flow sensor 24 is ordered according to a certain rule, and includes a first layer flow sensor and a second layer flow sensor, the first layer flow sensor is disposed on the cylindrical surface of the radial outer side of the first bored concrete pile 3, the first layer flow sensor includes flow sensor rings that are disposed at an interval from top to bottom and are circularly distributed, the distance between two adjacent flow sensor rings is equal, the flow sensor rings include a plurality of flow sensors that are uniformly distributed along the circumferential direction of the first bored concrete pile 3, in this embodiment, the flow sensor rings include 12 flow sensors.
The second laminar flow sensor is arranged on a cylindrical surface on the radial outer side of the first cast-in-place pile 3, the cylindrical surface on which the second laminar flow sensor is arranged is coaxial with the cylindrical surface on which the first laminar flow sensor is arranged, the cylindrical surface on which the second laminar flow sensor is arranged is positioned on the radial outer side of the cylindrical surface on which the first laminar flow sensor is arranged, the second laminar flow sensor comprises flow sensor rings which are arranged at intervals up and down and are distributed in a circular manner, the distance between every two adjacent flow sensor rings is equal, and in the up-down direction, the flow sensor ring of the second laminar flow sensor is positioned between every two adjacent flow sensor rings of the first laminar flow sensor; the flow sensor ring comprises a plurality of flow sensors which are uniformly distributed along the circumferential direction of the first cast-in-place pile 3; in this embodiment, the flow sensor ring includes 12 flow sensors.
A plurality of second flow sensors 27 are arranged around the second cast-in-place pile 4, the second flow sensors 27 are used for detecting cement slurry flow points around the second cast-in-place pile 4, and the circumferential arrangement form of the second flow sensors 27 in the second cast-in-place pile 4 is the same as the circumferential arrangement form of the first flow sensors 24 in the first cast-in-place pile 3, which is not described again. In this embodiment, each of the first flow sensor 24 and the second flow sensor 27 is numbered, and the specific position of the corresponding numbered flow sensor is also uniquely determined.
Be provided with loading mechanism above first box 1 and second box 2, loading mechanism exerts vertical load to first bored concrete pile 3 and second bored concrete pile 4 respectively, it is specific, loading mechanism is including fixing first bracing piece 7 on first box 1 and fixing the second bracing piece 8 on second box 2, be fixed with first diaphragm 9 and second diaphragm 10 between first bracing piece 7 and the second bracing piece 8, first diaphragm 9 and second diaphragm 10 interval set up from top to bottom, and first diaphragm 9 sets up the top at first bracing piece 7 and second bracing piece 8. The driving device is fixedly arranged on the first transverse plate 9, the lead screw 13 is arranged between the first transverse plate 9 and the second transverse plate 10 in a rotating mode, the driving device is in transmission connection with the lead screw 13, namely, the lead screw 13 can rotate between the first transverse plate 9 and the second transverse plate 10 through the driving device, in the embodiment, the driving device comprises a driving motor 11, the driving motor 11 is in transmission connection with a speed reducer 12, and an output shaft of the speed reducer 12 is in transmission connection with the lead screw 13 through a gear set.
A nut is matched with the screw thread on the screw rod 13, a first connecting rod 14 and a second connecting rod 15 are fixedly connected to the nut, in the embodiment, the first connecting rod 14 and the second connecting rod 15 are both horizontally arranged, the first connecting rod 14 and the second connecting rod 15 are symmetrically arranged relative to the screw rod 13, one end of the first connecting rod 14, which is far away from the nut, is in guiding sliding fit with the first supporting rod 7, one end of the second connecting rod 15, which is far away from the nut, is in guiding sliding fit with the second supporting rod 8, in the embodiment, a first guiding long groove is formed in one side, which faces the screw rod 13, of the first supporting rod 7, and the end of the first connecting rod 14 is in guiding sliding fit with the first guiding long groove; a second guiding long groove is formed in one side, facing the lead screw 13, of the second support rod 8, and the end of the second connecting rod 15 is in guiding sliding fit with the second guiding long groove. A first top pressure rod is fixed on the first connecting rod 14, a second top pressure rod is fixed on the second connecting rod 15, a first guide hole for the first top pressure rod to pass through is formed in the second transverse plate 10, the first top pressure rod and the first guide hole are in guide sliding fit, a second guide hole for the second top pressure rod to pass through is formed in the second transverse plate 10, and the second top pressure rod and the second guide hole are in guide sliding fit. In this embodiment, the first box 1 and the second box 2 are symmetrically arranged with respect to the screw 13, the first cast-in-place pile 3 and the second cast-in-place pile 4 are symmetrically arranged with respect to the screw 13, the first jacking rod and the first cast-in-place pile 3 are vertically arranged correspondingly, and the second jacking rod and the second cast-in-place pile 4 are vertically arranged correspondingly.
In the invention, the first top pressure rod and the second top pressure rod in the loading mechanism are symmetrically arranged relative to the screw 13, and the first top pressure rod is used for pressing the first cast-in-place pile 3 and the second top pressure rod is used for pressing the second cast-in-place pile 4 through the same driving device and the screw nut structure, so that the loading of the first cast-in-place pile 3 by the first top pressure rod and the loading of the second cast-in-place pile 4 by the second top pressure rod are ensured to be the same.
The other side and the air compressor 16 intercommunication of mud storage tank 17, exert pressure through the grout thick liquid of air compressor 16 in to mud storage tank 17, make the grout thick liquid flow out from mud storage tank 17, mud storage tank 17 is connected with first thick liquid distributor through first pipeline, first thick liquid distributor communicates with the filling pipe among each straight tube slip casting pipe 25 respectively, first thick liquid distributor is used for evenly distributed entering the thick liquid volume of the filling pipe among the straight tube slip casting pipe 25, and control the thick liquid and get into in two filling pipes simultaneously, thereby realize that two filling pipes carry out pile side slip casting simultaneously.
The slurry storage tank 17 is connected with a second slurry distributor through a second pipeline, the second slurry distributor is respectively communicated with the guide pipes 29 of the annular grouting pipes 28, on one hand, the second slurry distributor can determine the sequence of slurry entering the annular grouting pipes 28, on the other hand, the slurry amount entering each annular grouting pipe 28 can be guaranteed to be the same, in the embodiment, the structures and the use principles of the first slurry distributor and the second slurry distributor belong to the prior art, and the description is omitted.
The comparison and selection test model of the invention also comprises a data acquisition device 18, and the data acquisition device 18 is respectively connected with the first flow sensor 24 and the second flow sensor 27 in a control way. In order to make the conducting wires of the first flow sensor 24 and the second flow sensor 27 more orderly, in this embodiment, a plurality of first long cylinders 5 extending in the up-down direction are arranged in the first box body 1, specifically, two first long cylinders 5 are arranged, and the conducting wires of the first flow sensor 24 are gathered in the first long cylinders 5 and are in control connection with the data acquisition device 18; a plurality of second long cylinders 6 extending in the up-down direction are arranged in the second box body 2, specifically, two second long cylinders 6 are arranged, and the leads of the second flow sensor 27 are collected in the second long cylinders 6 and are in control connection with the data acquisition device 18. In this embodiment, the structure and the using principle of the data acquisition device 18 are the prior art, and are not described herein again, and the data acquisition device 18 collects information of each of the first flow sensor 24 and the second flow sensor 27.
The comparison and selection test model further comprises a controller 19 and a visualization platform 20, the controller 19 is in control connection with the data acquisition device 18, in the embodiment, the controller 19 is a PLC controller, the visualization platform 20 is in control connection with the controller 19, the visualization platform 20 comprises a comparison and selection test three-dimensional model, the comparison and selection test three-dimensional model comprises point positions corresponding to the first flow sensor 24 and the second flow sensor 27 one by one, if the first flow sensor 24 and the second flow sensor 27 detect that cement slurry flows, under the combined action of the data acquisition device 18 and the controller 19, the controller 19 transmits the data detected by the first flow sensor 24 and the second flow sensor 27 to the comparison and selection test three-dimensional model, the corresponding point positions in the three-dimensional model can be highlighted, so that the diffusion condition of the cement slurry is displayed on the comparison and selection test three-dimensional model, the visualization of the flow diffusion of the cement slurry of the post-grouting-to-testing grouting is realized, and whether the grouting is right after the upper section and the lower section is completely butted in the upper direction and the lower section. In this embodiment, the visualization platform 20 is the prior art, and the three-dimensional model is compared and selected from the visualization platform 20 as the prior art, which is not described herein again.
In the invention, a first pressure sensor is arranged at the top of a first cast-in-place pile 3 and is used for detecting the vertical load applied to the first cast-in-place pile 3 by a first jacking rod; a second pressure sensor is arranged at the top of the second cast-in-place pile 4 and used for detecting the vertical load applied to the second cast-in-place pile 4 by a second top pressure rod; a first displacement sensor 26 is fixed to the top of first box 1, first displacement sensor 26 being adapted to detect the distance of downward movement of first cast-in-place pile 3, and a second displacement sensor 30 is fixed to the top of second box 2, second displacement sensor 30 being adapted to detect the distance of downward movement of second cast-in-place pile 4. In this embodiment, the first pressure sensor and the second pressure sensor are in control connection with the controller 19, the first displacement sensor 26 and the second displacement sensor 30 are in control connection with the controller 19, and the controller 19 transmits data detected by the first pressure sensor, the second pressure sensor, the first displacement sensor 26 and the second displacement sensor 30 to the comparison test three-dimensional model so as to display loading and displacement conditions of the first cast-in-place pile 3 and the second cast-in-place pile 4 on the comparison three-dimensional model.
A first electromagnetic flowmeter and a first pressure sensor (not shown in the figure) are arranged at the grout outlet position of the end part of each filling pipe, the first electromagnetic flowmeter is used for measuring the grout flow rate at the grout outlet position of the filling pipe, and the first pressure sensor is used for measuring the grout pressure at the grout outlet position of the filling pipe; a second electromagnetic flowmeter and a second pressure sensor (not shown in the figure) are arranged at the second grout outlet of each annular grouting pipe 28, the second electromagnetic flowmeter is used for measuring the flow rate of the grout at the second grout outlet of the annular grouting pipe 28, and the second pressure sensor is used for measuring the pressure of the grout at the second grout outlet of the annular grouting pipe 28.
In this embodiment, the first electromagnetic flow meter, the first pressure sensor, the second electromagnetic flow meter, and the second pressure sensor are respectively connected to the control unit, and the controller 19 is further provided with a timer for recording the grouting time length of each section of height of each grouting pipe, and also recording the grouting time length of each annular grouting pipe 28. And simultaneously, the controller 19 records and displays the detection values on a visual platform 20 to be used as parameters of actual post-construction grouting.
The comparison and selection test model not only can visually display the two pile side grouting modes on the visual platform 20, but also can directly compare the two pile side grouting modes, so that the difference of the two pile side grouting modes can be more accurately and clearly known through the comparison and selection test model, and reference data is provided for actual construction.
In order to facilitate the test personnel to observe whether the upper and lower sections of post-grouting are exactly completely butted in the up-down direction, in this embodiment, an ultrasonic scanner (not shown in the figure) may be further arranged in the circumferential direction of the inner wall of the first box body and the circumferential direction of the inner wall of the second box body, so that whether the upper and lower sections of post-grouting of the first cast-in-place pile and the second cast-in-place pile are completely butted in the up-down direction can be more truly observed through the ultrasonic scanner.
Besides, as experimental apparatus, after all carry out the post-grouting to first bored concrete pile and second bored concrete pile, the grout solidifies the back, can tear first box and second box apart for first bored concrete pile and second bored concrete pile respectively, then cuts open the soil body around first bored concrete pile and the second bored concrete pile, comes the slip casting effect of two kinds of different slip casting modes of more audio-visual observation.
In the above embodiment, the first flow sensor includes a first layer flow sensor and a second layer flow sensor; in other embodiments, the first flow sensors comprise a first layer of flow sensors, a second layer of flow sensors and a third layer of flow sensors, wherein the number and the position arrangement of the third layer of flow sensors are the same as the arrangement form of the first layer of flow sensors and the second layer of flow sensors.
In the above embodiment, the first box body is provided with a plurality of first long cylinders, and the wires of the first flow sensor are collected in the first long cylinders and are connected with the data acquisition device in a control manner; a plurality of second long cylinders are arranged in the second box body, and leads of the second flow sensor are converged in the second long cylinders and are in control connection with the data acquisition device; in other embodiments, the first and second long cylinders may not be provided.
In the above embodiment, one side of the first supporting rod facing the screw rod is provided with a first guiding long groove, and an end of the first connecting rod is in guiding sliding fit with the first guiding long groove; a second guide long groove is formed in one side, facing the screw rod, of the second support rod, and the end of the second connecting rod is in guide sliding fit with the second guide long groove; in other embodiments, the first guide long groove and the second guide long groove may not be provided, and at this time, the first pressing rod and the first connecting rod are guided only through the first guide hole, and the second pressing rod and the second connecting rod are guided through the second guide hole.
In the above embodiment, the test soil body sequentially includes, from top to bottom, a clay layer, a coarse sand layer, and a gravel layer; in other embodiments, the test soil body may also comprise only clay and grit layers.
Claims (8)
1. The side mud jacking mode of back mud jacking stake selects test model than, characterized by includes:
a first box body: the test soil body is filled in the box body, a first cast-in-place pile extending along the vertical direction is embedded in the middle of the first box body, and the test soil body is exposed out of the top of the first cast-in-place pile;
a second box body: the test soil is filled in the second box body, the test soil filled in the second box body is the same as the test soil filled in the first box body, a second filling pile extending along the vertical direction is embedded in the middle of the second box body, and the test soil is exposed out of the top of the second filling pile;
a plurality of straight pipe grouting pipes are uniformly distributed in the circumferential direction of the first grouting pile, a plurality of first grout outlets are formed in the straight pipe grouting pipes at intervals in the up-down direction, a grouting pipe is arranged in each straight pipe grouting pipe, and each grouting pipe is communicated with a grout storage tank;
a plurality of annular grouting pipes are arranged at intervals along the up-down direction of the second cast-in-place pile, and the number of the annular grouting pipes is consistent with that of the first grout outlets of the straight pipe grouting pipes in the up-down direction; the annular grouting pipe is circumferentially provided with second grout outlets, and the number of the second grout outlets is consistent with that of the straight pipe grouting pipes; the annular grouting pipe comprises a guide pipe extending along the vertical direction, and the guide pipe is communicated with the slurry storage tank;
a plurality of first flow sensors are distributed around the first cast-in-place pile and used for detecting cement paste flow point positions around the first cast-in-place pile;
a plurality of second flow sensors are distributed around the second cast-in-place pile and used for detecting cement paste flow point positions around the second cast-in-place pile;
a loading mechanism: the loading mechanism is arranged above the first box body and the second box body and is used for applying vertical loads to the first cast-in-place pile and the second cast-in-place pile respectively;
a first pressure sensor: the first cast-in-place pile is arranged at the top of the first cast-in-place pile;
a second pressure sensor: the second cast-in-place pile is arranged at the top of the second cast-in-place pile;
a first displacement sensor: the first cast-in-place pile detection device is fixed at the top of the first box body and used for detecting the downward movement distance of the first cast-in-place pile;
a second displacement sensor: the second cast-in-place pile detection device is fixed at the top of the second box body and used for detecting the downward movement distance of the second cast-in-place pile;
a data acquisition device: the first flow sensor and the second flow sensor are respectively connected in a control way;
a controller: the controller is also respectively connected with the first pressure sensor and the second pressure sensor in a control way, and the controller is also respectively connected with the first displacement sensor and the second displacement sensor in a control way;
a visualization platform: the controller transmits data detected by the first flow sensor and the second flow sensor to the comparison and selection test three-dimensional model so as to display the diffusion condition of cement paste on the comparison and selection test three-dimensional model; and the controller transmits the data detected by the first pressure sensor, the second pressure sensor, the first displacement sensor and the second displacement sensor to the comparison and selection test three-dimensional model so as to display the loading and displacement conditions of the first cast-in-place pile and the second cast-in-place pile.
2. The post-grouting pile side grouting mode comparison and selection test model as claimed in claim 1, wherein the first flow sensor comprises a first layer of flow sensor and a second layer of flow sensor, the first layer of flow sensor is arranged on a cylindrical surface of the radially outer side of the first grouting pile, the first layer of flow sensor comprises flow sensor rings which are arranged at intervals up and down and are distributed in a circular shape, and the flow sensor rings comprise a plurality of flow sensors which are uniformly distributed along the circumferential direction of the first grouting pile; the second laminar flow sensor is arranged on a cylindrical surface on the radial outer side of the first cast-in-place pile, the cylindrical surface where the second laminar flow sensor is arranged is coaxial with the cylindrical surface where the first laminar flow sensor is arranged, the cylindrical surface where the second laminar flow sensor is arranged is positioned on the radial outer side of the cylindrical surface where the first laminar flow sensor is arranged, the second laminar flow sensor comprises flow sensor rings which are arranged at intervals from top to bottom and are distributed in a circular manner, and the flow sensor rings comprise a plurality of flow sensors which are uniformly distributed along the circumferential direction of the first cast-in-place pile; the circumferential arrangement form of the second flow sensors on the second cast-in-place pile is the same as the circumferential arrangement form of the first flow sensors on the first cast-in-place pile.
3. The post-grouting pile side grouting mode comparison test model as claimed in claim 2, wherein a plurality of first long cylinders are arranged in the first box body, and leads of the first flow sensor are gathered in the first long cylinders and are in control connection with the data acquisition device; and a plurality of second long cylinders are arranged in the second box body, and leads of the second flow sensor are collected in the second long cylinders and are in control connection with the data acquisition device.
4. The post-grouting pile side grouting mode comparison and selection test model as claimed in any one of claims 1 to 3, wherein the loading mechanism comprises a first supporting rod fixed on the first box body and a second supporting rod fixed on the second box body, a first transverse plate and a second transverse plate are fixed between the first supporting rod and the second supporting rod, the first transverse plate and the second transverse plate are arranged at intervals up and down, a lead screw is rotatably arranged between the first transverse plate and the second transverse plate, a nut is in threaded adaptation on the lead screw, a first connecting rod and a second connecting rod are fixedly connected to the nut, the first connecting rod and the second connecting rod are symmetrically arranged relative to the lead screw, one end of the first connecting rod, far away from the nut, is in guiding sliding fit with the first supporting rod, one end of the second connecting rod, far away from the nut, is in guiding sliding fit with the second supporting rod, a first jacking rod is fixed to the first connecting rod, a second jacking rod is fixed to the second connecting rod, and a first guiding hole and a second guiding hole are formed in the second transverse plate, which are in sliding fit with the first jacking rod and the second jacking rod respectively.
5. The post-grouting pile side grouting mode comparison test model as claimed in claim 4, wherein a first guide elongated slot is formed in one side of the first support rod facing the lead screw, and an end of the first connecting rod is in guide sliding fit with the first guide elongated slot; a second guide long groove is formed in one side, facing the screw rod, of the second supporting rod, and the end of the second connecting rod is in guide sliding fit with the second guide long groove; and the first transverse plate is provided with a driving device in transmission connection with the lead screw.
6. The post-grouting pile side grouting mode comparison test model according to any one of claims 1-3, wherein the test soil body sequentially comprises a clay layer, a coarse sand layer and a gravel layer from top to bottom, and the first cast-in-place pile and the second cast-in-place pile are respectively positioned on the clay layer.
7. The post-grouting pile side grouting mode comparison test model according to any one of claims 1-3, wherein the other side of the grout storage tank is communicated with an air compressor, the grout storage tank is connected with a first grout distributor through a first pipeline, and the first grout distributor is respectively communicated with the pouring pipes in the straight pipe grouting pipes; the slurry storage tank is connected with a second slurry distributor through a second pipeline, and the second slurry distributor is respectively communicated with the guide pipes of the annular grouting pipes.
8. The post-grouting pile side grouting mode comparison and selection test model according to any one of claims 1-3, wherein a first electromagnetic flowmeter and a first pressure sensor are arranged at the end part of the grouting pipe, a second electromagnetic flowmeter and a second pressure sensor are arranged at a second grout outlet of each annular grouting pipe, and the first electromagnetic flowmeter, the first pressure sensor, the second electromagnetic flowmeter and the second pressure sensor are respectively in control connection with a controller.
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| JPH08209675A (en) * | 1995-01-31 | 1996-08-13 | Toto Denki Kogyo Kk | Grout injection control device |
| CN103924586A (en) * | 2014-03-18 | 2014-07-16 | 沈保汉 | Multi-section reaming cast-in-place pile construction method |
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