CN115369933B - Post-grouting pile lateral grouting mode comparison test model - Google Patents
Post-grouting pile lateral grouting mode comparison test model Download PDFInfo
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- CN115369933B CN115369933B CN202211074400.8A CN202211074400A CN115369933B CN 115369933 B CN115369933 B CN 115369933B CN 202211074400 A CN202211074400 A CN 202211074400A CN 115369933 B CN115369933 B CN 115369933B
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- 239000002002 slurry Substances 0.000 claims abstract description 75
- 238000006073 displacement reaction Methods 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 17
- 230000000007 visual effect Effects 0.000 claims abstract description 14
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 23
- 239000004927 clay Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 10
- 238000012800 visualization Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000011440 grout Substances 0.000 description 17
- 238000010276 construction Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 8
- 238000007569 slipcasting Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a comparison test model of a side pressing mode of a post-grouting pile, which comprises a first box body and a second box body, wherein a first filling pile is buried in the first box body; the second box body is buried with a second filling pile; 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 grouting outlet; the second filling pile is provided with an annular grouting pipe, and a second grouting outlet is formed in the circumferential direction of the annular grouting pipe; the annular grouting pipe comprises a guide pipe which is communicated with the slurry storage tank; a first flow sensor is arranged around the first filling pile; a second flow sensor is arranged around the second filling pile; the loading mechanism applies vertical load to the first filling pile and the second filling pile respectively; 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 visual platform comprises a comparison test three-dimensional model, and cement paste diffusion conditions are displayed on the comparison test three-dimensional model.
Description
Technical Field
The invention belongs to the technical field of post-grouting modes of pile foundations, and particularly relates to a post-grouting pile lateral grouting mode comparison test model.
Background
Pile foundations are used as a common basic form and widely applied to civil engineering, high-speed railways, highways, municipal bridges in cities, ports and wharfs, large buildings and other engineering. The post grouting technology is adopted under the general condition of the cast-in-place pile, mainly aims at improving the defects of the construction technology, improving the bearing capacity of the pile foundation, reducing the settlement, further designing the pile length if necessary and saving the construction cost. The post-grouting pipeline arrangement mode mainly comprises straight pipe distribution type and annular pipe type.
The straight pipe distributed middle grouting pipe is arranged along the length direction of the grouting pile in an extending mode (namely, the grouting pipe is distributed in a straight pipe mode), a plurality of grouting pipes can be arranged in the circumferential direction of the grouting pile, a plurality of grouting outlets are formed in the grouting pipe at intervals in the up-down direction, the grouting pipe comprises two plugging units which are arranged at intervals in the up-down direction, the upper plugging unit and the lower plugging unit plug the grouting pipe at the upper side and the lower side of the grouting outlet, and therefore cement paste entering from the grouting pipe can only flow out from the grouting outlets to form pile side grouting; the annular pipe type is that the grouting pipe is annular in the circumference of the filling pile, the annular grouting pipe comprises a guide pipe extending along the upper and lower directions, cement slurry enters the annular grouting pipe from the guide pipe and is discharged from a slurry outlet of the annular grouting pipe, and a plurality of annular grouting pipes can be arranged at intervals up and down in the longitudinal direction of the filling pile. However, in actual construction, in the pile-side grouting method of a cast-in-place pile, the permeation rate and the bearing capacity of slurry under the same conditions of straight pipe distribution and annular pipe cannot be accurately known, and the pile-side grouting method is puzzled when being selected in construction.
Disclosure of Invention
In view of the above, the present invention aims to provide a comparative selection test model for a post-grouting pile side grouting mode, so as to solve the technical problem that in the prior art, the selection of the pile side grouting mode of a cast-in-place pile is difficult.
In order to achieve the purpose, the technical scheme adopted by the comparison test model of the post-grouting pile side-grouting mode is as follows:
the post-grouting pile lateral grouting mode comparison test model comprises the following steps:
first box: the test soil is filled, a first filling pile extending in the up-down direction is buried in the middle of the first box body, and the top of the first filling pile is exposed out of the test soil;
and a second box: the test soil is filled in the first box body, the test soil filled in the first box body is the same as the test soil filled in the second box body, a first filling pile extending along the vertical direction is buried in the middle of the first box body, and the top of the first filling pile is exposed out of the test soil;
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 grouting outlets are formed in the straight pipe grouting pipes at intervals along the up-down direction, and the grouting pipes are communicated with the grouting tanks;
the second cast-in-place pile is provided with a plurality of annular grouting pipes at intervals along the up-down direction, and the number of the annular grouting pipes is consistent with that of the first grouting outlets of the straight pipe grouting pipes along the up-down direction; the annular grouting pipe is circumferentially provided with second grouting openings, and the number of the second grouting openings is consistent with that of the straight pipe grouting pipes; the annular grouting pipe comprises a guide pipe extending along the up-down direction, and the guide pipe is communicated with the slurry storage tank;
a plurality of first flow sensors are arranged around the first filling pile, and the first flow sensors are used for detecting cement paste flow points around the first filling pile;
a plurality of second flow sensors are arranged around the second filling pile, and the second flow sensors are used for detecting cement paste flow points around the second filling pile;
loading mechanism: the loading mechanism is arranged above the first box body and the second box body and respectively applies vertical load to the first filling pile and the second filling pile;
a first pressure sensor: the first filling pile is arranged at the top of the first filling pile;
a second pressure sensor: the second filling pile is arranged at the top of the second filling pile;
a first displacement sensor: the first filling pile is fixed at the top of the first box body and used for detecting the downward moving distance of the first filling pile;
a second displacement sensor: the second pouring pile is fixed at the top of the second box body and used for detecting the downward moving distance of the second pouring pile;
and the data acquisition device comprises: the first flow sensor is respectively connected with the second flow sensor in a control way;
and (3) a controller: the controller is in control connection with the data acquisition device, is also in control connection with the first pressure sensor and the second pressure sensor respectively, and is also in control connection with the first displacement sensor and the second displacement sensor respectively;
visualization platform: the visual platform is in control connection with the controller, and the controller transmits data detected by the first flow sensor and the second flow sensor to the comparison test three-dimensional model so as to display cement paste diffusion conditions on the comparison test three-dimensional model; the controller transmits data detected by the first pressure sensor, the second pressure sensor, the first displacement sensor and the second displacement sensor to the comparison test three-dimensional model so as to display loading and displacement conditions of the first filling pile and the second filling pile.
The beneficial effects are that: according to the post grouting pile lateral pressure slurry mode comparison 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 slurry flow points around the first grouting pile; a plurality of second flow sensors are arranged around the second filling pile, and the second flow sensors are used for detecting cement paste flow points around the second filling pile; the method comprises the steps that a first flow sensor is used for transmitting the cement paste flow condition of the first filling pile in the circumferential direction to a data acquisition device, the data acquisition device is used for transmitting the data to a controller, the controller is used for transmitting the data to a comparison test three-dimensional model in a visual platform, and the cement paste flow condition of the first filling pile in the circumferential direction is displayed through the visual platform; the cement paste flowing condition of the second filling pile circumference is transmitted to the data acquisition device through the second flow sensor, and is transmitted to the controller through the data acquisition device, and the controller transmits data to the comparison test three-dimensional model in the visual platform, so that the cement paste flowing condition of the second filling pile circumference is displayed through the visual platform, and the visualization of the post grouting slurry diffusion condition is realized. Moreover, the setting of loading mechanism can push down the loading simultaneously to first bored concrete pile and second bored concrete pile, can realize respectively through first pressure sensor, second pressure sensor, first displacement sensor, second displacement sensor that loading and displacement condition to first bored concrete pile and second bored concrete pile detect to will show on visual platform. Moreover, the invention can achieve the consistency of test conditions in the two-middle-back grouting form and is more visual in comparison due to the comparison and selection of the two forms of straight pipe distribution type and annular pipe type in the back grouting.
Further, the first flow sensor comprises a first flow sensor and a second flow sensor, the first flow sensor is arranged on the cylindrical surface of the radial outer side of the first filling pile, the first flow sensor comprises flow sensor rings which are arranged at intervals up and down and distributed in a circular shape, and the flow sensor rings comprise a plurality of flow sensors uniformly distributed along the circumferential direction of the first filling 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 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 circularly distributed, and the flow sensor rings comprise a plurality of flow sensors uniformly distributed along the circumferential direction of the first cast-in-place pile; the second flow sensor is arranged in the circumferential direction of the second bored concrete pile in the same manner as the first flow sensor is arranged in the circumferential direction of the first bored concrete pile.
The beneficial effects are that: the first flow sensor and the second flow sensor can be arranged to detect the seepage expansion dynamics of the cement paste in the circumferential directions of the first filling pile and the second filling pile more comprehensively and three-dimensionally.
Further, a plurality of first long cylinders are arranged in the first box body, and wires of the first flow sensor are collected in the first long cylinders and are in control connection with the data acquisition device; the second box body is internally provided with a plurality of second long cylinders, and the wires of the second flow sensor are collected in the second long cylinders and are in control connection with the data acquisition device.
The beneficial effects are that: the arrangement of the first long cylinder and the second long cylinder can collect the wires of the first flow sensor and the second flow sensor respectively, so that the distribution wires of the first flow sensor and the second flow sensor are tidier, and the accuracy of data transmission of each first flow sensor and each second flow sensor is guaranteed.
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 screw rod is rotatably arranged between the first transverse plate and the second transverse plate, a nut is screwed and adapted to the screw rod, 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 screw rod, one end, far away from the nut, of the first connecting rod is in guide sliding fit with the first supporting rod, one end, far away from the nut, of the second connecting rod is in guide sliding fit with the second supporting rod, a first top pressing rod is fixed on the first connecting rod, a second top pressing rod is fixed on the second connecting rod, and a first guide hole and a second guide hole are respectively formed in the second transverse plate, and are in guide sliding fit with the first top pressing rod and the second top pressing rod.
The beneficial effects are that: the setting of loading mechanism can carry out simultaneous loading to first bored concrete pile and second bored concrete pile, and can satisfy that the load of the loading of first bored concrete pile and second bored concrete pile at the same time equals.
Further, a first guiding 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 guiding sliding fit with the first guiding long groove; a second guiding long groove is formed in one side, facing the screw rod, of the second support rod, and the end part of the second connecting rod is in guiding sliding fit with the second guiding long groove; the first transverse plate is provided with a driving device in transmission connection with the screw rod.
The beneficial effects are that: the first guide long groove and the second guide long groove are arranged to guide the first support rod and the second support rod respectively.
The test soil body comprises a clay layer, a coarse sand layer and a gravel layer from top to bottom in sequence, and the first cast-in-place pile and the second cast-in-place pile are respectively located on the clay layer.
The beneficial effects are that: the test soil body can be more attached to the construction condition 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 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 pipe of the annular grouting pipe.
The beneficial effects are that: the arrangement of the slurry distributor can balance the slurry entering each pouring pipe and can control whether the slurry enters the guide pipe of the annular grouting pipe.
The end part of the pouring 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 the second slurry 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 connected with the controller in a control manner.
The beneficial effects are that: the first pressure sensor is used for measuring the pressure of the slurry at the end part of the pouring pipe, and the first electromagnetic flowmeter is used for measuring the flow rate of the cement slurry at the end part of the pouring pipe; the second pressure sensor is used for measuring the pressure of the second grouting outlet of the annular grouting pipe, and the second electromagnetic flowmeter is used for measuring the flow of the second grouting outlet of the annular grouting pipe, so that the cement slurry pressure and the flow of the two types of post grouting are conveniently counted, and reference data can be provided for actual construction.
Drawings
FIG. 1 is a schematic structural diagram of a post-grouting pile side-pressing slurry mode comparison test model of the invention;
FIG. 2 is a schematic structural view of a first box of the post-grouting pile side-pressing mode comparison test model in FIG. 1;
FIG. 3 is a schematic structural view of a second box of the post-grouting pile side-pressing mode comparison test model in FIG. 1;
FIG. 4 is a partial cross-sectional view of the first housing of FIG. 2;
fig. 5 is a partial cross-sectional view of the second case of fig. 3.
Reference numerals: 1-a first box; 2-a second box; 3-a first filling pile; 4-a second filling pile; 5-a first long barrel; 6-a second long barrel; 7-a first support bar; 8-a second support bar; 9-a first cross plate; 10-a second cross plate; 11-a drive motor; 12-a speed reducer; 13-a lead screw; 14-a first connecting rod; 15-a second connecting rod; a 16-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; a 23-clay layer; 24-a first flow sensor; 25-a straight pipe grouting pipe; 26-a first displacement sensor; 27-a second flow sensor; 28-an annular grouting pipe; 29-a guide tube; 30-a second displacement sensor.
Detailed Description
The following describes the post-grouting pile lateral pressure slurry mode comparison test model in detail by referring to the attached drawings and the specific embodiments:
as shown in fig. 1, the post grouting pile side grouting mode comparison test model comprises a first box body 1, wherein test soil is filled in the first box body 1, a first filling pile 3 extending in the up-down direction is buried in the middle of the first box body 1, and the top of the first filling pile 3 is exposed out of the test soil; the second box body 2 is filled with a test soil body, a second filling pile 4 extending along the up-down direction is buried in the middle of the second box body 2, and the top of the second filling pile 4 is exposed out of the test soil body. In this embodiment, the test soil in the first case 1 is the same as the test soil in the second case 2, the test soil sequentially includes the clay layer 23, the coarse sand layer 22 and the crushed stone layer 21 from top to bottom, and the boundary between the clay layer 23 and the coarse sand layer 22 in the first case 1 is the same as the boundary between the clay layer 23 and the coarse sand layer 22 in the second case 2, and the boundary between the coarse sand layer 22 and the crushed stone layer 21 in the first case 1 is the same as the boundary between the coarse sand layer 22 and the crushed stone layer 21 in the second case 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 model piles, and the materials and dimensions of the first cast-in-place pile 3 and the second cast-in-place pile 4 are the same. It should be noted that, in the comparison test model of the present invention, the structural dimensions of the first casing 1, the second casing 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 compared with the structural dimensions of the existing construction.
The circumference equipartition of first bored concrete pile 3 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 surface, and straight tube slip casting pipe 25 is equipped with a plurality of first grout outlets along upper and lower direction interval, and in this embodiment, every straight tube slip casting pipe 25 is equipped with four first grout outlets along upper and lower direction interval, and the distance between two adjacent first grout outlets equals. The straight pipe grouting pipe 25 is internally provided with a grouting pipe, the grouting pipe comprises two plugging units which are arranged at intervals up and down, the plugging units which are arranged at intervals up and down plug the straight pipe grouting pipe 25 at the upper side and the lower side of the first grout outlet respectively, the grouting pipe is communicated with the grout storage tank 17, thereby grouting grout into the grouting pipe through the grout storage tank 17, and grout in the grouting pipe flows out from the first grout outlet. In this embodiment, cement slurry is simultaneously supplied to the pouring pipes of the two straight pipe grouting pipes 25, and, when post-grouting is performed on the pile side, grouting is sequentially performed along the straight pipe grouting pipes 25 from bottom to top. In this embodiment, a device for post grouting by using a straight pipe grouting pipe belongs to the prior art, and structures of a plugging unit, a grouting pipe and the like all belong to the prior art, and are not described herein.
The second cast-in-place pile 4 is provided with a plurality of annular grouting pipes 28 at intervals along the up-down direction, the number of the annular grouting pipes 28 is consistent with the number of the first grouting outlets of the straight pipe grouting pipes 25 along the up-down direction, in the embodiment, the second cast-in-place pile 4 is provided with four annular grouting pipes 28 at intervals along the up-down direction, and the distances between two adjacent annular grouting pipes 28 are equal; the second grout outlets are circumferentially arranged on the annular grouting pipe 28, the number of the second grout outlets is consistent with that of the straight pipe grouting pipes 25, in the embodiment, the two second grout outlets are circumferentially arranged on the annular grouting pipe 28, and the two second grout outlets are 180-degree distributed on the circumference of the second filling pile 4. In this way, the arrangement of the first grout outlet for grouting after the first cast-in-place pile 3 is the same as the arrangement of the second grout outlet for grouting after the second cast-in-place pile 4 is the same, the number of the first grout outlets is the same, and the positions of the grout outlets are the same as those of the cast-in-place pile. Each of the annular grouting pipes 28 includes a guide pipe 29 extending in the up-down direction, and the guide pipe 29 is provided in communication with the slurry tank 17. When post-grouting is performed on the pile side, grouting is performed on the lower annular grouting pipe 28, then grouting is performed on the upper annular grouting pipe 28 in sequence, and post-grouting is performed on the pile side in the sequence from bottom to top corresponding to the second cast-in-place pile 4. In this embodiment, a device for post grouting by using an annular grouting pipe belongs to the prior art, and the structure of the annular grouting pipe belongs to the prior art, and is not described herein again.
A plurality of first flow sensors 24 are arranged in the test soil around the first cast-in-place pile 3, and the first flow sensors 24 are used for detecting cement paste flow points 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 flow sensor and a second flow sensor, where the first flow sensor is disposed on a cylindrical surface of a radial outer side of the first bored concrete pile 3, the first flow sensor includes flow sensor rings that are distributed circularly and are disposed at intervals up and down, distances between two adjacent flow sensor rings are equal, the flow sensor rings include a plurality of flow sensors uniformly distributed along a circumferential direction of the first bored concrete pile 3, and 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 circularly-distributed flow sensor rings which are arranged at intervals up and down, the distances between two adjacent flow sensor rings are equal, and in the up-down direction, the flow sensor rings of the second laminar flow sensor are positioned between the two adjacent flow sensor rings of the first laminar flow sensor; the flow sensor ring comprises a plurality of flow sensors uniformly distributed along the circumferential direction of the first filling 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 bored concrete pile 4, the second flow sensors 27 are used for detecting cement slurry flowing points around the second bored concrete pile 4, the circumferential arrangement form of the second flow sensors 27 on the second bored concrete pile 4 is the same as the circumferential arrangement form of the first flow sensors 24 on the first bored concrete pile 3, and the description is omitted here. In this embodiment, each of the first flow sensor 24 and the second flow sensor 27 is assigned a number, and the specific position of the flow sensor corresponding to the number is also uniquely determined.
The loading mechanism is arranged above the first box body 1 and the second box body 2, vertical loads are applied to the first cast-in-place pile 3 and the second cast-in-place pile 4 respectively, and specifically, the loading mechanism comprises a first supporting rod 7 fixed on the first box body 1 and a second supporting rod 8 fixed on the second box body 2, a first transverse plate 9 and a second transverse plate 10 are fixed between the first supporting rod 7 and the second supporting rod 8, the first transverse plate 9 and the second transverse plate 10 are arranged at intervals up and down, and the first transverse plate 9 is arranged at the tops of the first supporting rod 7 and the second supporting rod 8. A driving device is fixedly arranged on the first transverse plate 9, a screw rod 13 is rotatably arranged between the first transverse plate 9 and the second transverse plate 10, the driving device is in transmission connection with the screw rod 13, namely, the screw rod 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 screw rod 13 through a gear set.
The screw rod 13 is provided with a nut in a threaded fit manner, the nut is fixedly connected with a first connecting rod 14 and a second connecting rod 15, in the embodiment, the first connecting rod 14 and the second connecting rod 15 are horizontally arranged, the first connecting rod 14 and the second connecting rod 15 are symmetrically arranged relative to the screw rod 13, one end, far away from the nut, of the first connecting rod 14 is in guide sliding fit with the first supporting rod 7, one end, far away from the nut, of the second connecting rod 15 is in guide sliding fit with the second supporting rod 8, in the embodiment, one side, facing the screw rod 13, of the first supporting rod 7 is provided with a first guide long groove, and the end part of the first connecting rod 14 is in guide sliding fit with the first guide long groove; a second guiding long groove is formed in one side, facing the screw rod 13, of the second support rod 8, and the end portion of the second connecting rod 15 is in guiding sliding fit with the second guiding long groove. The first connecting rod 14 is fixedly provided with a first top pressing rod, the second connecting rod 15 is fixedly provided with a second top pressing rod, the second transverse plate 10 is provided with a first guide hole for the first top pressing rod to pass through, the first top pressing rod is in guide sliding fit with the first guide hole, the second transverse plate 10 is provided with a second guide hole for the second top pressing rod to pass through, and the second top pressing rod is in guide sliding fit with the second guide hole. In this embodiment, the first casing 1 and the second casing 2 are symmetrically arranged relative to the screw rod 13, the first cast-in-place pile 3 and the second cast-in-place pile 4 are symmetrically arranged relative to the screw rod 13, the first top compression rod and the first cast-in-place pile 3 are correspondingly arranged up and down, and the second top compression rod and the second cast-in-place pile 4 are correspondingly arranged up and down.
According to the invention, the first jacking rod and the second jacking rod in the loading mechanism are symmetrically arranged relative to the screw rod 13, and the jacking of the first jacking rod to the first cast-in-place pile 3 and the jacking of the second jacking rod to the second cast-in-place pile 4 are simultaneously realized through the same driving device and screw rod nut structure, so that the loading of the first jacking rod to the first cast-in-place pile 3 and the loading of the second jacking rod to the second cast-in-place pile 4 can be ensured to be the same.
The other side of the slurry storage tank 17 is communicated with the air compressor 16, the air compressor 16 is used for pressing the cement slurry in the slurry storage tank 17, so that the cement slurry flows out of the slurry storage tank 17, the slurry storage tank 17 is connected with a first slurry distributor through a first pipeline, the first slurry distributor is respectively communicated with the pouring pipes in each straight pipe grouting pipe 25, the first slurry distributor is used for uniformly distributing the slurry quantity entering the pouring pipes in the straight pipe grouting pipe 25, and the slurry is controlled to enter the two pouring pipes simultaneously, so that the two pouring pipes are used for grouting at the same time.
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, the second slurry distributor can determine the sequence of the slurry entering the annular grouting pipes 28 on one hand, and on the other hand, the slurry entering each annular grouting pipe 28 can be ensured to have the same quantity, in this embodiment, the structures and the use principles of the first slurry distributor and the second slurry distributor belong to the prior art, and are not repeated here.
The comparison test model of the present invention further comprises a data acquisition device 18, the data acquisition device 18 being in control connection with the first flow sensor 24 and the second flow sensor 27, respectively. In order to make the 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 disposed in the first box 1, specifically, two first long cylinders 5 are disposed, and the wires of the first flow sensor 24 are collected 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 wires of a 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 use principle of the data acquisition device 18 are the prior art, and are not described herein, and the information of each of the first flow sensor 24 and the second flow sensor 27 is collected by the data acquisition device 18.
The comparison test model of the invention further comprises a controller 19 and a visual 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 visual platform 20 is in control connection with the controller 19, the visual platform 20 comprises a comparison test three-dimensional model, the comparison test three-dimensional model comprises points corresponding to the first flow sensor 24 and the second flow sensor 27 one by one, if some of the first flow sensor 24 and the second flow sensor 27 detect that cement paste flows, the controller 19 transmits data detected by the first flow sensor 24 and the second flow sensor 27 to the comparison test three-dimensional model under the combined action of the data acquisition device 18 and the controller 19, so that the corresponding points in the three-dimensional model can be highlighted, the cement paste diffusion condition is displayed on the comparison test three-dimensional model, the visualization of cement paste flow diffusion of post-grouting conversion grouting is realized, and the test personnel can conveniently observe whether grouting is completely butted in the vertical direction or not right up and down. In this embodiment, the visualization platform 20 is in the prior art, and the three-dimensional model of the selected test model in the visualization platform 20 is in the prior art, which is not described herein.
In the invention, a first pressure sensor is arranged at the top of a first filling pile 3 and is used for detecting the vertical load applied to the first filling pile 3 by a first top pressure rod; a second pressure sensor is arranged at the top of the second filling pile 4 and is used for detecting the vertical load applied to the second filling pile 4 by the second jacking rod; a first displacement sensor 26 is fixed on the top of the first box 1, the first displacement sensor 26 is used for detecting the downward moving distance of the first cast-in-place pile 3, a second displacement sensor 30 is fixed on the top of the second box 2, and the second displacement sensor 30 is used for detecting the downward moving distance of the 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, so that on one hand, direct comparison of two post-pile pressing side pressure slurry modes is conveniently realized, and on the other hand, comparison visualization is realized, thereby enabling comparison to be more visual.
The slurry outlet position of the end part of each pouring tube is provided with a first electromagnetic flowmeter and a first pressure sensor (not shown in the figure), wherein the first electromagnetic flowmeter is used for measuring the slurry flow rate of the slurry outlet position of the pouring tube, and the first pressure sensor is used for measuring the slurry pressure of the slurry outlet position of the pouring tube; a second electromagnetic flowmeter and a second pressure sensor (not shown) are arranged at the second slurry outlet of each annular grouting pipe 28, the second electromagnetic flowmeter is used for measuring the slurry flow rate at the second slurry outlet of the annular grouting pipe 28, and the second pressure sensor is used for measuring the slurry pressure at the second slurry outlet of the annular grouting pipe 28.
In this embodiment, the first electromagnetic flowmeter, the first pressure sensor, the second electromagnetic flowmeter, and the second pressure sensor are respectively connected with the control, and a timer is further provided in the controller 19, for recording grouting duration of each section of height of each grouting pipe, and may also record grouting duration of each annular grouting pipe 28. Meanwhile, the controller 19 records and displays the detected value on the visualization platform 20 to serve as a parameter of grouting after actual construction.
The comparison test model can visually display two pile side pressing slurry modes on the visual platform 20, and can directly compare the two pile side pressing slurry modes, so that the difference between the two pile side pressing slurry modes can be more accurately and clearly known through the comparison test model, and reference data can be provided for actual construction.
In order to facilitate the testers to observe whether the upper section and the lower section of rear grouting are just completely butted in the vertical direction, in this embodiment, ultrasonic scanners (not shown in the figure) can 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, and whether the upper section and the lower section of rear grouting of the first cast-in-place pile and the second cast-in-place pile are completely butted in the vertical direction is more truly observed through the ultrasonic scanners.
Besides, as an experimental device, after the first cast-in-place pile and the second cast-in-place pile are subjected to post grouting, after the slurry is solidified, the first box body and the second box body can be detached for the first cast-in-place pile and the second cast-in-place pile respectively, and then soil bodies around the first cast-in-place pile and the second cast-in-place pile are cut, so that grouting effects of two different grouting modes can be observed more intuitively.
In the above embodiment, the first flow sensor includes a first flow sensor and a second flow sensor; in other embodiments, the first flow sensor includes a first layer of flow sensor, a second layer of flow sensor, and a third layer of flow sensor, where the number and the position arrangement of the third layer of flow sensor are the same as the layout form of the first layer of flow sensor and the second layer of flow sensor.
In the above embodiment, a plurality of first long cylinders are disposed in the first box, and the wires of the first flow sensor are collected in the first long cylinders and are in control connection with the data acquisition device; a plurality of second long cylinders are arranged in the second box body, and wires of the second flow sensor are collected in the second long cylinders and are in control connection with the data acquisition device; in other embodiments, the first and second elongate cylinders may not be provided.
In the above embodiment, a first guiding long groove is formed on one side of the first support rod facing the screw rod, and the end of the first connecting rod is in guiding sliding fit with the first guiding long groove; a second guiding long groove is formed in one side, facing the screw rod, of the second support rod, and the end part of the second connecting rod is in guiding sliding fit with the second guiding long groove; in other embodiments, the first guiding slot and the second guiding slot may not be provided, and the first top pressing rod and the first connecting rod are guided only through the first guiding hole, and the second top pressing rod and the second connecting rod are guided through the second guiding hole.
In the embodiment, the test soil body sequentially comprises a clay layer, a coarse sand layer and a crushed stone layer from top to bottom; other embodiments summarize, the test soil may also include only clay layers and coarse sand layers.
Claims (7)
1. The post-grouting pile lateral grouting mode comparison test model is characterized by comprising the following steps:
first box: the test soil is filled, a first filling pile extending in the up-down direction is buried in the middle of the first box body, and the top of the first filling pile is exposed out of the test soil;
and a second box: the second filling pile is embedded in the middle of the second box body, and the top of the second filling pile is exposed out of the test soil;
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 grouting outlets are formed in the straight pipe grouting pipes at intervals along the up-down direction, and the grouting pipes are communicated with the grouting tanks;
the second cast-in-place pile is provided with a plurality of annular grouting pipes at intervals along the up-down direction, and the number of the annular grouting pipes is consistent with that of the first grouting outlets of the straight pipe grouting pipes along the up-down direction; the annular grouting pipe is circumferentially provided with second grouting openings, and the number of the second grouting openings is consistent with that of the straight pipe grouting pipes; the annular grouting pipe comprises a guide pipe extending along the up-down direction, and the guide pipe is communicated with the slurry storage tank;
a plurality of first flow sensors are arranged around the first filling pile, and the first flow sensors are used for detecting cement paste flow points around the first filling pile;
a plurality of second flow sensors are arranged around the second filling pile, and the second flow sensors are used for detecting cement paste flow points around the second filling pile;
loading mechanism: the loading mechanism is arranged above the first box body and the second box body and respectively applies vertical load to the first filling pile and the second filling pile;
a first pressure sensor: the first filling pile is arranged at the top of the first filling pile;
a second pressure sensor: the second filling pile is arranged at the top of the second filling pile;
a first displacement sensor: the first filling pile is fixed at the top of the first box body and used for detecting the downward moving distance of the first filling pile;
a second displacement sensor: the second pouring pile is fixed at the top of the second box body and used for detecting the downward moving distance of the second pouring pile;
and the data acquisition device comprises: the first flow sensor is respectively connected with the second flow sensor in a control way;
and (3) a controller: the controller is in control connection with the data acquisition device, is also in control connection with the first pressure sensor and the second pressure sensor respectively, and is also in control connection with the first displacement sensor and the second displacement sensor respectively;
visualization platform: the visual platform is in control connection with the controller, and the controller transmits data detected by the first flow sensor and the second flow sensor to the comparison test three-dimensional model so as to display cement paste diffusion conditions on the comparison test three-dimensional model; the controller transmits data detected by the first pressure sensor, the second pressure sensor, the first displacement sensor and the second displacement sensor to the comparison test three-dimensional model so as to display loading and displacement conditions of the first filling pile and the second filling pile;
the first flow sensor comprises a first flow sensor and a second flow sensor, the first flow sensor is arranged on a cylindrical surface on the radial outer side of the first filling pile, the first flow sensor comprises flow sensor rings which are arranged at intervals up and down and distributed in a circular shape, and the flow sensor rings comprise a plurality of flow sensors uniformly distributed along the circumferential direction of the first filling 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 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 circularly distributed, and the flow sensor rings comprise a plurality of flow sensors uniformly distributed along the circumferential direction of the first cast-in-place pile; the second flow sensor is arranged in the circumferential direction of the second bored concrete pile in the same manner as the first flow sensor is arranged in the circumferential direction of the first bored concrete pile.
2. The post-grouting pile side-pressing mode comparison test model according to claim 1, wherein a plurality of first long cylinders are arranged in the first box body, and wires of the first flow sensor are collected in the first long cylinders and are in control connection with the data acquisition device; the second box body is internally provided with a plurality of second long cylinders, and the wires of the second flow sensor are collected in the second long cylinders and are in control connection with the data acquisition device.
3. The post-grouting pile lateral-pressure slurry-pressing mode comparison test model according to claim 1 or 2, 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 an upper-lower interval, a screw rod is rotatably arranged between the first transverse plate and the second transverse plate, a nut is screwed on the screw rod, a first connecting rod and a second connecting rod are fixedly connected to the screw rod, the first connecting rod and the second connecting rod are symmetrically arranged relative to the screw rod, one end, far away from the screw rod, of the first connecting rod is in guide sliding fit with the first supporting rod, one end, far away from the screw rod, of the second connecting rod is in guide sliding fit with the second supporting rod, a first top pressure rod is fixed on the first connecting rod, a second top pressure rod is fixed on the second connecting rod, and a first guide hole and a second guide hole are respectively formed in the second transverse plate, and are respectively in guide sliding fit with the first top pressure rod and the second top pressure rod.
4. The model for comparing and selecting the slurry pressing mode of the rear grouting pile according to claim 3, wherein a first guiding long groove is formed on one side of the first supporting rod facing the screw rod, and the end part of the first connecting rod is in guiding sliding fit with the first guiding long groove; a second guiding long groove is formed in one side, facing the screw rod, of the second support rod, and the end part of the second connecting rod is in guiding sliding fit with the second guiding long groove; the first transverse plate is provided with a driving device in transmission connection with the screw rod.
5. The post-grouting pile side-pressing slurry mode comparison test model according to claim 1 or 2, wherein the test soil body comprises a clay layer, a coarse sand layer and a crushed stone layer from top to bottom in sequence, and the first cast-in-place pile and the second cast-in-place pile are respectively located on the clay layer.
6. The post-grouting pile side-pressing slurry mode comparison test model according to claim 1 or 2, wherein 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 pouring pipes in each straight pipe grouting pipe; 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 pipe of the annular grouting pipe.
7. The post-grouting pile side-pressing slurry mode comparison test model according to claim 1 or 2, wherein a first electromagnetic flowmeter and a first pressure sensor are arranged at the end part of the pouring pipe, a second electromagnetic flowmeter and a second pressure sensor are arranged at the second slurry 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 connected with the controller in a control manner.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107489432A (en) * | 2017-09-18 | 2017-12-19 | 山东科技大学 | Tunnel support grouting equipment and its grouting method |
| CN107513995A (en) * | 2017-08-07 | 2017-12-26 | 中国水利水电第十工程局有限公司 | A kind of bridge struction pile post grouting construction method |
| CN110374094A (en) * | 2019-05-30 | 2019-10-25 | 中国建筑第二工程局有限公司 | Construction method of mechanical pore-forming cast-in-place pile |
| CN111945713A (en) * | 2020-07-24 | 2020-11-17 | 中交第三航务工程局有限公司 | Construction method for grouting after rock-socketed inclined pile of offshore wind power foundation steel pipe pile |
| WO2021004007A1 (en) * | 2019-07-10 | 2021-01-14 | 上海建为历保科技股份有限公司 | Foundation reinforcement method for conventional building |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021017984A1 (en) * | 2019-07-31 | 2021-02-04 | 青岛理工大学 | Soil pressure and displacement monitoring system and method for miniature steel pipe pile body |
-
2022
- 2022-09-03 CN CN202211074400.8A patent/CN115369933B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107513995A (en) * | 2017-08-07 | 2017-12-26 | 中国水利水电第十工程局有限公司 | A kind of bridge struction pile post grouting construction method |
| CN107489432A (en) * | 2017-09-18 | 2017-12-19 | 山东科技大学 | Tunnel support grouting equipment and its grouting method |
| CN110374094A (en) * | 2019-05-30 | 2019-10-25 | 中国建筑第二工程局有限公司 | Construction method of mechanical pore-forming cast-in-place pile |
| WO2021004007A1 (en) * | 2019-07-10 | 2021-01-14 | 上海建为历保科技股份有限公司 | Foundation reinforcement method for conventional building |
| CN111945713A (en) * | 2020-07-24 | 2020-11-17 | 中交第三航务工程局有限公司 | Construction method for grouting after rock-socketed inclined pile of offshore wind power foundation steel pipe pile |
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