CN212459182U - Model device of self-expansion pile supporting structure - Google Patents

Model device of self-expansion pile supporting structure Download PDF

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Publication number
CN212459182U
CN212459182U CN202020996447.XU CN202020996447U CN212459182U CN 212459182 U CN212459182 U CN 212459182U CN 202020996447 U CN202020996447 U CN 202020996447U CN 212459182 U CN212459182 U CN 212459182U
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China
Prior art keywords
soil sample
self
box body
supporting
pressure
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Expired - Fee Related
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CN202020996447.XU
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Chinese (zh)
Inventor
陈星欣
张欣然
杨恒超
郭力群
蔡奇鹏
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Jiangsu Geology & Engineering Co ltd
Huaqiao University
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Jiangsu Geology & Engineering Co ltd
Huaqiao University
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Priority to CN202020996447.XU priority Critical patent/CN212459182U/en
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Abstract

The utility model discloses a model device of a self-expansion pile supporting structure, which comprises a bracket, a test box body, a loading system, a confined water system, a supporting system and a measuring system, wherein the loading system is used for simulating the house loads on two sides of a river channel, is arranged on the bracket and can apply loads to the top end of a soil sample in the box body; the confined water system is used for simulating confined water around a river channel and communicated with the water inlet holes to input water flow to the soil sample; the supporting system is used for simulating a self-expansion pile and is arranged in the soil sample; the measuring system is used for shooting and analyzing the deformation of the foundation soil sample in the test process and is placed in front of the transparent side face of the test box body. Because the model device is installed indoors, the effect of the self-expansion pile supporting structure in actual river channel dredging can be really restored through the loading system, the pressure-bearing water system, the supporting system and the measuring system, and the effect of the self-expansion pile in actual river channel dredging can be predicted and evaluated in advance.

Description

Model device of self-expansion pile supporting structure
Technical Field
The utility model relates to a from expansion pile supporting construction's model device for simulate true excavation in-process, the atress of stake warp and peripheral soil body warp the wait condition.
Background
Because the river water flow speed is slow, a large amount of silt and silt are deposited on the riverbed, and the deposition of the river channel influences the normal play of multiple functions such as flood control, waterlogging drainage, irrigation, navigation and the like, the river channel dredging is needed for recovering the normal functions of the river channel and promoting the rapid and continuous development of the economy and the society. The cast-in-situ bored pile is a common supporting technology in a sludge layer, large machinery and a large field are required during construction, and the bearing capacity of the sludge field is low, so that the load of the large machinery cannot be borne. And large-scale machinery needs a construction site in a large range, but the surrounding houses of the river channel are dense, the construction space is narrow, and the construction site in the large range needed by the large-scale machinery cannot be met. In addition, the pore-forming needs slurry to fix the wall, the slag is difficult to discard, and the construction process is complex. The conventional cast-in-situ bored pile is not in a proper form, so that the self-expansion pile is adopted for supporting, and small or medium-sized engineering machinery is adopted for construction, so that the over-high requirement of large machinery such as a large crawler crane on the bearing capacity of a foundation soil body is avoided, and the construction operation is convenient; however, the conditions of stress deformation, surrounding soil deformation and the like of the expansion pile in the actual excavation process are not clear, and no model device is used for simulating to give test data.
SUMMERY OF THE UTILITY MODEL
The utility model provides a from inflation stake supporting construction's model device has overcome the not enough that the background art exists. The utility model provides an adopted technical scheme of its technical problem is:
a form assembly for a self-expanding pile support structure, comprising:
a support;
the test box body is positioned in the bracket and at least provided with a transparent side surface, a soil sample is placed in the test box body, and the test box body is provided with a water inlet;
the loading system is used for simulating the load of houses on two sides of the river channel, is arranged on the bracket and can apply load to the top end of a soil sample in the box body;
the pressure-bearing water system is used for simulating pressure-bearing water around a river channel and communicated with the water inlet hole so as to input water flow to a soil sample;
a support system for simulating a self-expanding pile, disposed within the soil sample;
the measuring system is used for shooting and analyzing the deformation of the foundation soil sample in the test process and is placed in front of the transparent side face of the test box body.
In a preferred embodiment: the supporting system comprises a supporting wall, the supporting wall comprises a plurality of grouting pipes and connecting pieces which are arranged side by side at intervals, grouting holes are formed in the side walls of the grouting pipes, a columnar soil engineering bag used for containing paste cement paste is hermetically fixed on the periphery of each grouting pipe, the grouting pipes are inserted into a soil sample, and the connecting pieces connect the plurality of grouting pipes together.
In a preferred embodiment: the supporting system comprises two supporting walls which are arranged at intervals left and right.
In a preferred embodiment: the loading system comprises a jack, a pressurizing plate and a pressure sensor, wherein the pressurizing plate is placed at the top end of the soil sample, the jack is installed on the support and can pressurize the pressurizing plate, and the pressure sensor is installed on the jack and can measure the pressure exerted by the jack.
In a preferred embodiment: the pressure-bearing water system comprises a high-pressure constant-flow pump and a water tank, the high-pressure constant-flow pump is connected with the water tank through a first guide pipe, and the water tank is connected with the water inlet hole through a second guide pipe.
In a preferred embodiment: the measuring system adopts a particle image velocimetry system.
In a preferred embodiment: the soil sample comprises gravel on a bottom layer and sludge stacked on the gravel.
In a preferred embodiment: the thickness of the gravel is 0.1 to 0.3 m, and the thickness of the sludge is 1.1 to 1.5 m.
Compared with the background technology, the technical scheme has the following advantages:
1. because the model device is installed indoors, the effect of the self-expansion pile supporting structure in actual river channel dredging can be really restored through the loading system, the pressure-bearing water system, the supporting system and the measuring system, and the effect of the self-expansion pile in actual river channel dredging can be predicted and evaluated in advance.
2. The grouting pipes are inserted into the soil sample, the grouting pipes are grouted, cement paste enters the columnar geotextile bags from the grouting holes, the connecting pieces connect the grouting pipes together to form a supporting wall, the supporting wall is favorable for further revealing compaction and drainage hardening effects of the supporting system on surrounding soft soil layers, the operation method is simple, convenient and rapid, and the simulated actual supporting effect is obvious.
3. The loading system applies vertical load to the pressurizing plate by using the jack, and the pressurizing plate transmits the vertical load to the soil sample to simulate house load generated by changes of floors on two sides of a river channel, so that the influence of the peripheral house load on dredging and excavating can be comprehensively and accurately reflected, the supporting technology is improved in the later real dredging and excavating process, and the adverse effect of dredging and excavating on peripheral houses is reduced.
4. Accurate flow conveying is achieved through the high-pressure advection pump, pressure-bearing water with different pressures can be provided through the control end, and therefore simulation of continuous dynamic changes of the pressure-bearing water in the test box body is achieved, and influences on dredging and excavating under different pressure-bearing water conditions can be reflected better. The model device can be used for carrying out different confined water simulation tests of a plurality of groups, the modification of the simulation device is reduced, the working principle is simple, the operation is convenient, the test cost and the model making time are saved, and the model device has great practicability.
5. The measuring system adopts a particle image speed measuring system, can measure the motion state of the soil sample at each moment, realizes the same instantaneous recording of the velocity distribution information of a large amount of gravels and sludge, and can provide abundant flow field spatial structure and flow characteristics at the same time, thereby obtaining the moving state of the soil sample in the excavation and desilting process. By observing the resilience of the foundation caused by the excavation of the river channel and the deformation of the foundation caused by the upper load, the foundation pit soil deformation rule caused by the dredging excavation can be further disclosed.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view showing the entire model apparatus.
Figure 2 shows a schematic cross-sectional view of a timbering system.
Detailed Description
Referring to fig. 1 to 2, a preferred embodiment of a model apparatus for a self-expandable pile supporting structure includes a support frame, a test box 20, a loading system, a pressure-bearing water system, a supporting system, and a measuring system.
As shown in fig. 1, the support comprises a bottom plate 11, a top plate 12 and a vertical rod 13, wherein the vertical rod 13 connects the bottom plate 11 and the top plate 12 to form the support. The vertical bar 13 has a length of 2000 mm.
The test box 20 is placed in the support and at least has a transparent side surface, a soil sample is placed in the test box 20, and the right side surface of the test box 20 is provided with a plurality of water inlet holes 21 which are arranged at intervals up and down. In this embodiment, the test chamber 20 is a rectangular parallelepiped having a length, width, and height of 2000 × 1000 × 1500 mm and a wall thickness of 20 mm. The front surface of the test box body 20 is made of transparent toughened glass, the left side surface, the right side surface, the rear side surface and the bottom surface of the test box body are made of stainless steel plates, and the top surface of the test box body is provided with an opening. In this embodiment, a longitudinally extending filter screen 22 is disposed near the water inlet 21, the filter screen is parallel to the right side surface of the test box 20, the thickness of the filter screen 22 is 20 mm, the aperture of the mesh of the filter screen 22 is 0.5 mm, and the gap between the meshes is 5 mm.
In this embodiment, the soil sample includes a gravel layer 31 on the bottom layer and a sludge layer 32 stacked on the gravel layer 31.
In this embodiment, the thickness of the gravel layer 31 is 0.1 to 0.3 m, and the thickness of the sludge layer 32 is 1.1 to 1.5 m. Preferably, the gravel layer 31 has a thickness of 0.2 m and the sludge layer 32 has a thickness of 1.3 m.
The loading system is used for simulating the load of houses on two sides of the river channel, is installed on the support and can apply load to the top end of the soil sample in the box body 20.
In this embodiment, the loading system includes a jack 41, a pressurizing plate 42, and a pressure sensor (not shown), the pressurizing plate 42 is placed on the top end of the soil sample, the jack 41 is mounted on the support and can pressurize the pressurizing plate 42, and the pressure sensor is mounted on the jack 41 and can measure the pressure applied by the jack 41. In this embodiment, two jacks 41, two pressurizing plates 42 and two pressure sensors are arranged symmetrically. The pressurizing plate 42 is a steel plate having a length and width of 400 × 400 mm and a thickness of 4 mm. The left pressure plate 42 is spaced 200 mm from the left side of the casing 20 and 300 mm from the top plate. The loading point is at the center of gravity of the compression plate 42. When the jack 41 is used for simulating the house load, the house load can be continuously changed from no house load to the house load of a six-storey house, namely, the vertical load which is changed between 0 and 30KN can be applied to the soil sample; the loading rate may be from 0.2kN/s to 0.4 KN/s.
The confined water system is used for simulating confined water around a river course and communicated with the water inlet holes 21 through a guide pipe so as to input water flow to a soil sample.
In this embodiment, the confined water system includes a high-pressure constant-flow pump 52 and a water tank 53, the high-pressure constant-flow pump 52 is connected to the water tank 53 through a first conduit 51, and the water tank 53 is connected to the water inlet 21 through a second conduit 54. The water flow of 0-15Kpa is conveyed by adjusting the input parameters of the high-pressure advection pump 52, the water flow is pumped into the water tank 53 through the first conduit 51, then flows through the second conduit 54 and the water inlet hole 21, then flows through the filter screen 22, and enters the gravel layer 31 and the sludge layer 32 of the soil sample, and because the gravel layer 31 has water permeability, the water flow can simulate confined water after entering the gravel layer 31.
The support system is used for simulating a self-expanding pile and is arranged in the soil sample.
In this embodiment, the supporting system includes a supporting wall, the supporting wall includes a plurality of grout pipes 61, connecting piece 62 of interval arrangement side by side, grout hole 64 has been seted up to grout pipe 61 lateral wall, and each grout pipe 61 periphery is fixed with the column geotechnological bag 63 that is used for adorning paste grout in a sealed manner, and grout pipe 61 inserts in the soil sample, and connecting piece 62 links together a plurality of grout pipe 61.
In this embodiment, the supporting system includes two supporting walls arranged at a distance from each other. Nine grout tubes 61 are required for each retaining wall.
The reinforcing steel bars are inserted into the sludge and then form nine insertion holes to position the grouting pipes 61, the hole diameters of the insertion holes are 200 mm, the distance between the central axis of each insertion hole and the left side edge or the right side edge is 800 mm, the distance between the surface of each insertion hole and the top plate is 75 mm, and the distance between the centers of the two adjacent insertion holes is 150 mm. The reinforcing bar can be taken out, also can remain in the soil sample, and when it remained in the soil sample, the reinforcing bar can play the effect of grout passageway and direction, support. In this embodiment, the rebar is retained within the soil sample. The grouting pipe 61 is a seamless steel pipe with the diameter of 30 mm, the wall thickness of 5 mm and the length of 1000 mm, and the grouting pipe 61 vertically penetrates through the steel bars and extends into the foundation at the bottom end of the sludge layer 32. The columnar geotextile bags 63 are tied at the head end and the tail end of the grouting pipe 61 through steel strands for sealing and fixing. The columnar geotextile bag 63 is made of impermeable geotextile materials and has a diameter of 200 mm. By filling paste cement slurry into the grouting pipe 61, the cement slurry enters the columnar geotextile bags 63 through the grouting holes, and grouting is stopped until the columnar geotextile bags 63 are fully expanded to a certain strength. The grouting speed should be controlled at 20-40L/min to ensure that the columnar geotextile bags 63 have sufficient drainage and filtration time.
In this embodiment, the connecting member 62 is an angle steel, and the side length and the thickness of the angle steel are equal-edge angles of 70 mm × 4 mm. After the nine grouting pipes 61 are grouted, the nine grouting pipes are connected to the top ends of the nine grouting pipes 61 through angle steel to form a complete supporting wall, and the integrity of the supporting wall is improved. At this time, the installation of the supporting wall on one side is completed, and similarly, the installation of the supporting wall on the other side can be completed according to the same steps.
The measurement system is used to photograph and analyze the deformation of the subsoil sample during the test, placed in front of the transparent side of the test chamber 20.
In this embodiment, the measurement system adopts a particle image velocimetry system. The particle image velocimetry system adopts the prior art. Firstly, manufacturing a control point: manufacturing white solid dots with the diameter of 3 mm by using a white electrical tape, adhering the white solid dots to the side face of the toughened glass of the test box body, wherein the white solid dots are control points, the control points are uniformly distributed on the inner side face of the toughened glass, and the distance between every two adjacent control points is 50 mm; then, arranging a darkroom in front of the test box body, and arranging LED lamp panels on two sides of toughened glass of the test box body; the Canon EOS 5D MARK IV single-reflex machine with the lowest resolution of 4608 × 2592 is selected, the single automatic focusing can reach 7 pieces/second, so that the camera is placed right in front of the toughened glass and has the characteristics of high-speed continuous shooting and high acquisition frequency. The deformation of the soil sample during excavation in the state of confined water in the test process is shot by a camera, and the shot picture is analyzed by adopting a Geo ion image velocimetry program, so that the deformation condition of the soil sample at any moment is obtained.
The use method of the model device of the self-expansion pile supporting structure in the river channel dredging comprises the following steps:
step 10, filling the prepared soil sample into a test box 20: firstly, filling a gravel layer 31 at the bottom layer, wherein the thickness is 0.2 m; then, a sludge layer 32 is filled on the gravel, and the thickness of the sludge layer 32 is 1.3 m;
step 20, installing a loading system, a pressure-bearing water system and a measuring system:
installation of a loading system: firstly, placing two pressure plates 42 on the top end surface of a soil sample, wherein the left pressure plate 42 is 200 mm away from the left side of the box body 20 and 300 mm away from the top plate 12, the right pressure plate 42 is 200 mm away from the right side of the box body 20 and 300 mm away from the top plate 12, and marks are arranged at the gravity center of the pressure plates 42 by using a marking pen to serve as loading points; then, two jacks 41 are arranged on the top plate 12 and correspond to the loading points of the two pressurizing plates 42 one by one, and pressure sensors are arranged on the jacks 41 and used for measuring the pressure applied by the jacks 41;
installation of a pressure water system: placing a high-pressure constant-flow pump 52 in a water pool outside the test box body 20, wherein one end of a first conduit 51 is connected with the high-pressure constant-flow pump 52, the other end of the first conduit is communicated with a water tank 53, and the water tank 53 is communicated with the water inlet hole 21 through a second conduit 54;
installation of a measuring system: firstly, manufacturing a control point: manufacturing white solid dots with the diameter of 3 mm by using a white electrical tape, adhering the white solid dots to the side face of the toughened glass of the test box body, wherein the white solid dots are control points, the control points are uniformly distributed on the inner side face of the toughened glass, and the distance between every two adjacent control points is 50 mm; then, arranging a darkroom in front of the test box body, and arranging LED lamp panels on two sides of toughened glass of the test box body; placing a camera right in front of the tempered glass;
step 30, starting a loading system to apply proper pressure to the soil sample to simulate house load, and starting a confined water system to input water flow with proper pressure to the soil sample to simulate confined water; specifically, a vertical load with the change of 0-30KN is applied to the pressurizing plate 42 through the jack 41, and the loading rate is in the range of 0.2kN/s-0.4 KN/s;
step 40, installing a supporting system in the soil sample; specifically, the method comprises the following steps: arranging a soil sample, determining the position of a grouting pipe 61, and inserting a reinforcing steel bar into the soil sample to form a jack; then vertically penetrating the grouting pipe 61 fixed with the columnar geotextile bag through the jack to be fixed in the soil sample, wherein the reinforcing steel bar is positioned in the grouting pipe 61; grouting the grouting pipes 61 at odd arrangement positions, controlling the grouting speed at 20-40L/min, and grouting the grouting pipes 61 at even arrangement positions after the columnar geobags 63 at odd arrangement positions are fully expanded and reach certain strength; finally, all grouting pipes 61 are connected together through angle steel connecting pieces 62 to form a complete supporting wall; the supporting walls on the left side and the right side are installed in the same mode; through the cross grouting of odd-numbered rows and even-numbered rows, the position of each columnar geobag can be kept at an accurate position, and meanwhile, two adjacent columnar geobags can be tightly attached together, so that the supporting wall is firmer and firmer. The phenomenon that grouting strength of the columnar geobags is insufficient and the columnar geobags can be prevented from deviating to preset positions due to the fact that grouting is conducted on all grouting pipes simultaneously is avoided.
Step 50, starting a measuring system to shoot and analyze deformation of the foundation soil sample in the test process; specifically, the method comprises the following steps: and starting a camera to automatically shoot, and analyzing the shot picture through a Geo particle image velocimetry program to obtain the deformation condition of the soil sample at any moment.
Because the model device is installed indoors, the effect of the self-expansion pile supporting structure in actual river channel dredging can be really restored through the additional installation system, the pressure-bearing water system, the supporting system and the measuring system, and the effect of the self-expansion pile in actual river channel dredging can be predicted and evaluated in advance.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims (8)

1. The utility model provides a model device from inflation stake supporting construction which characterized in that: it includes:
a support;
the test box body is positioned in the bracket and at least provided with a transparent side surface, a soil sample is placed in the test box body, and the test box body is provided with a water inlet;
the loading system is used for simulating the load of houses on two sides of the river channel, is arranged on the bracket and can apply load to the top end of a soil sample in the box body;
the pressure-bearing water system is used for simulating pressure-bearing water around a river channel and communicated with the water inlet hole so as to input water flow to a soil sample;
a support system for simulating a self-expanding pile, disposed within the soil sample;
the measuring system is used for shooting and analyzing the deformation of the foundation soil sample in the test process and is placed in front of the transparent side face of the test box body.
2. A model device of a self-expanding pile support structure according to claim 1, characterised in that: the supporting system comprises a supporting wall, the supporting wall comprises a plurality of grouting pipes and connecting pieces which are arranged side by side at intervals, grouting holes are formed in the side walls of the grouting pipes, a columnar soil engineering bag used for containing paste cement paste is hermetically fixed on the periphery of each grouting pipe, the grouting pipes are inserted into a soil sample, and the connecting pieces connect the plurality of grouting pipes together.
3. A self-expanding pile support structure formwork apparatus as claimed in claim 2, wherein: the supporting system comprises two supporting walls which are arranged at intervals left and right.
4. A model device of a self-expanding pile support structure according to claim 1, characterised in that: the loading system comprises a jack, a pressurizing plate and a pressure sensor, wherein the pressurizing plate is placed at the top end of the soil sample, the jack is installed on the support and can pressurize the pressurizing plate, and the pressure sensor is installed on the jack and can measure the pressure exerted by the jack.
5. A model device of a self-expanding pile support structure according to claim 1, characterised in that: the pressure-bearing water system comprises a high-pressure constant-flow pump and a water tank, the high-pressure constant-flow pump is connected with the water tank through a first guide pipe, and the water tank is connected with the water inlet hole through a second guide pipe.
6. A model device of a self-expanding pile support structure according to claim 1, characterised in that: the measuring system adopts a particle image velocimetry system.
7. A model device of a self-expanding pile support structure according to claim 1, characterised in that: the soil sample comprises gravel on a bottom layer and sludge stacked on the gravel.
8. A self-expanding pile support structure formwork arrangement as claimed in claim 7, wherein: the thickness of the gravel is 0.1 to 0.3 m, and the thickness of the sludge is 1.1 to 1.5 m.
CN202020996447.XU 2020-06-03 2020-06-03 Model device of self-expansion pile supporting structure Expired - Fee Related CN212459182U (en)

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CN202020996447.XU CN212459182U (en) 2020-06-03 2020-06-03 Model device of self-expansion pile supporting structure

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111665130A (en) * 2020-06-03 2020-09-15 华侨大学 Model device of self-expansion pile supporting structure and use method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111665130A (en) * 2020-06-03 2020-09-15 华侨大学 Model device of self-expansion pile supporting structure and use method
CN111665130B (en) * 2020-06-03 2024-07-02 华侨大学 Model device of self-expanding pile supporting structure and use method

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