CN106248495A - The indoor long-term assay device of post grouting pile of simulated groundwater flowing and test method thereof - Google Patents
The indoor long-term assay device of post grouting pile of simulated groundwater flowing and test method thereof Download PDFInfo
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- CN106248495A CN106248495A CN201610585670.3A CN201610585670A CN106248495A CN 106248495 A CN106248495 A CN 106248495A CN 201610585670 A CN201610585670 A CN 201610585670A CN 106248495 A CN106248495 A CN 106248495A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
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Abstract
The invention discloses the indoor long-term assay device of post grouting pile of a kind of simulated groundwater flowing, including proof box with toward the dynamic Fluid Dynamics device of injection water flow simulation Groundwater Flow in this proof box, described proof box is built-in with simulation stake, the lower end of this simulation stake offers slurry outlet, and the upper end of this simulation stake connects the squeezing unit for grout injection；Described proof box is provided with lever bracket, and this lever bracket one end is rotatably connected with proof box, and the other end is unsettled, and this free end connects counterweight charger.The indoor long-term assay device of post grouting pile of this simulated groundwater flowing solves the post jacking bearing test under simulated groundwater flox condition, can be fully understood by actual mud jacking process and mud jacking complete after the condensation rate of cement grout, specify the consumption of cement grout and cost-effective；The post grouting pile indoor long term test flowed secondly by this simulated groundwater, can disclose the rule of pouring mortar pile long-time bearing performance, make post-grouting technology more perfect.
Description
Technical field
The present invention relates to pouring mortar pile assay device and the test method of field of civil engineering, particularly relate to a kind of simulation ground
The indoor long-term assay device of post grouting pile of lower water flowing and construction method thereof.
Background technology
The bearing capacity improving pile foundation is played a significant role by post-grouting technology.Post grouting pile is carried by the most many scholars
Mechanism has done corresponding laboratory test analysis and research, has obtained a series of fruitful theory and actual application achievement, but
Most post jacking theories are all based on without drawing under subsoil water or subsoil water quiescent conditions.Subsoil water be formed with two kinds
Approach, a kind of is that subsoil water causes the flowing of water to form dynamic water owing to region exists head difference；Another is due to waterproof
Curtain or waterproof structures existing defects and destruction and cause the seepage of subsoil water to form dynamic water.Therefore, subsurface flow is solved
Under the conditions of Dong, grouting result problem just becomes the key improving bearing capacity of pile foundation.Mud jacking theory under the conditions of Groundwater Flow is ground
Studying carefully seldom, the research of most of indoor model post-pressure groutings theory is all not consider subsoil water or subsoil water quiescent conditions
Under, and under subsoil water quiescent conditions and under the conditions of Groundwater Flow the Diffusion Law of serosity and diffusion mechanism have the biggest not
With, the conclusion obtained with the test of subsoil water quiescent conditions drag for mud jacking engineering practice under the conditions of instructing Groundwater Flow is
Irrational, it is therefore desirable to post grouting pile laboratory test under the conditions of Groundwater Flow is furtherd investigate.
It would therefore be highly desirable to solution the problems referred to above.
Summary of the invention
Goal of the invention: the first object of the present invention be to provide one can be fully understood by mud jacking process and mud jacking complete after cement
The indoor long-term assay device of post grouting pile that the condensation rate of serosity, the simulated groundwater of clear and definite cement mortar consumption flow.
Another goal of the invention of the present invention is to provide the post grouting pile indoor long term test dress of this simulated groundwater flowing
The test method put.
Technical scheme: for realizing object above, the post grouting pile of a kind of simulated groundwater of the present invention flowing is indoor
Long term test device, including proof box with toward the dynamic Fluid Dynamics device of injection water flow simulation Groundwater Flow, institute in this proof box
Stating proof box and be built-in with simulation stake, the lower end of this simulation stake offers slurry outlet, and the upper end of this simulation stake connects to be had for irrigating
The squeezing unit of cement mortar；Described proof box is provided with lever bracket, and this lever bracket one end is rotatably connected with proof box, the other end
Unsettled, this free end connects and has counterweight charger.
Wherein, described dynamic Fluid Dynamics device includes the header tank at external water source and for fixing the height adjustable of this header tank
Frame, the outside of this header tank is equipped with bottom and offers the water-collecting tray of gap, and the bottom of this header tank offers water outlet
Mouthful, this outlet injects current by water inlet pipe in proof box；Wherein control flow at water source and make the water yield of inflow header tank
More than the water yield of inflow proof box, the current of excess are overflowed into water-collecting tray by header tank top, and flow out from gap, make examination
Stable level in tryoff.
Preferably, described squeezing unit includes agitator, pulp-absorbing pipe, mudjack and the feed pipe for mortar being sequentially connected with, this defeated slurry
Defeated slurry Pressure gauge it is additionally provided with on pipe.
Further, described simulation stake upper end connects three way cock, defeated with squeezing unit of one end of this three way cock
Slurry pipe is connected, and one end is connected with the madjack pipe above simulation stake, and the other end is connected with slurry-returning device；And on madjack pipe 26
It is provided with mud jacking valve.
Preferably, described slurry-returning device includes slurry storing tank and return pipe, and one end of this return pipe is stretched in slurry storing tank, another
End is connected with three way cock；Overfall valve and overfall Pressure gauge it is additionally provided with on this return pipe.
Further, described counterweight charger is the counterweight basket that can arbitrarily increase and decrease counterweight.
The test method of the indoor long-term assay device of post grouting pile of a kind of simulated groundwater of present invention flowing, including as follows
Step:
(1) inserting in proof box by soil sample, carry out compaction in layers, until design height, Model Pile can pre-buried soil sample or beat
Enter in soil sample；
(2) dynamic Fluid Dynamics operation: be connected with proof box by water inlet pipe by header tank, is controlled flow at water source and makes inflow
The water yield of header tank is overflowed into water-collecting tray more than the water yield of inflow proof box, the current of excess by header tank top, and from overflowing
The mouth of a river is flowed out, and makes header tank Water discharge flow speed reach stable level in design load, and proof box；
(3) mud jacking operation: use three way cock feed pipe for mortar, return pipe and madjack pipe to be connected and form a loop, in pressure
It is respectively equipped with mud jacking valve and overfall valve on slurry pipe and return pipe, first overfall valve is reached maximum during mud jacking, make serosity complete
Portion returns in slurry storing tank, more slowly turns down overfall valve, makes manometric reading reach the mud jacking pressure of requirement, then by mud jacking valve
Door is opened, and regulation mud jacking valve makes pressure be basically stable at mud jacking force value；Model Pile is carried out mud jacking, remembers during mud jacking
The record time of mud jacking, mud jacking amount, mud jacking pressure and slurry flow rate；
(4) long-term load operations: after mud jacking terminates and reaches intensity, by increasing the weight of counterweight charger on lever bracket
Code carries out bearingtest to Model Pile, persistently observes displacement at pile top situation of change at different time, detects Groundwater Flow bar
The grouting result of pouring mortar pile under part.
Beneficial effect: compared with prior art, the present invention has following remarkable advantage: first this simulated groundwater flows
The indoor long-term assay device of post grouting pile solves the post jacking bearing test under simulated groundwater flox condition, can be fully understood by
Actual mud jacking process and mud jacking complete after the condensation rate of cement grout, specify the consumption of cement grout and cost-effective；The most logical
Cross the post grouting pile indoor long term test of this simulated groundwater flowing, the rule of pouring mortar pile long-time bearing performance can be disclosed, after making
Grouting Technology is more perfect, it is simple to improve the bearing capacity of pile foundation so that it is preferably apply in Practical Project construction；Furthermore, should
Assay device solves the flowing of dynamic water water source simulated groundwater, and head is stablized and the adjustable key issue of head height；Solve
Reduce the undulatory property of grouting pressure, protection precision pressure gauge and the key issue of regulation grouting pressure；Finally this assay device
Technique is simple and convenient to operate, safe and reliable, economic and practical, it is simple to popularization and application.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the top view of header tank in the present invention；
Fig. 3 is the sectional view of header tank in the present invention；
Fig. 4 is the structural representation of squeezing unit in the present invention；
Fig. 5 is the structural representation of slurry-returning device in the present invention；
Fig. 6 is the top view of lever bracket part in Fig. 1；
Fig. 7 is the partial schematic diagram of lever bracket part in Fig. 1.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described further.
As it is shown in figure 1, the indoor long-term assay device of the post grouting pile of a kind of simulated groundwater of present invention flowing includes test
Case 1, dynamic Fluid Dynamics device 2, simulation stake 3, slurry outlet 4, squeezing unit 5, lever bracket 6 and counterweight charger 7.This proof box 1
Bottom there is outlet pipe 27.Inserting in proof box 1 by soil (rock) body, placement in layers appropriate compacting, Model Pile can be in back-up sand
Time embedment or squeeze in proof box after back-up sand.In this proof box 1, water flow simulation subsoil water is injected by dynamic Fluid Dynamics device 2
Flowing, the upper end of simulation stake 3 is connected to the squeezing unit 5 of grout injection, and the lower end of this simulation stake 3 offers slurry outlet 4.
Above-mentioned proof box 1 is provided with lever bracket 6, and this lever bracket 6 one end is rotatably connected with proof box 1, and the other end is unsettled, this free end
Upper connection has counterweight charger 7, and this counterweight charger 7 is the counterweight basket that can arbitrarily increase and decrease counterweight.
As shown in Figure 6 and Figure 7, the present invention uses squeezing unit 5 that simulation stake is carried out mud jacking, completes at mud jacking and reaches to set
Carry out bearingtest after meter intensity, utilize lever bracket 6 and counterweight charger 7 that Model Pile 3 is carried out long-time bearing performance inspection
Survey.Welding lever bracket 6 in proof box 1, with the cushion block 29 on lever bracket 6 as basic point, lever one end is welded on turning of proof box
On moving axis 28, in the counterweight basket of the other end hanging of lever bracket, place counterweight, utilize lever principle to load, loaded weight
It is multiplied by moment equal to counterweight weight, facilitates long term test to load.Model Pile 3 is positioned at lever bracket 6 times, by increasing counterweight, lever
Frame 6 applies pressure to cushion block 29, thus acts on Model Pile 3, and pouring mortar pile can be carried out long-term load test.
As shown in Figures 2 and 3, above-mentioned dynamic Fluid Dynamics device 2 includes the header tank 8 at external water source and catchments for fixing this
The Height Adjustable cribbing 9 of case 8, support 9 can arbitrarily regulate the height on its vertical direction.
The outside of this header tank 8 is equipped with bottom and offers the water-collecting tray 11 of gap 10, and the bottom of this header tank 8 offers
Outlet 12, this outlet 12 injects current by water inlet pipe 13 in proof box 1；Wherein the water at water source is flowed into by water pipe
Header tank 8, water pipe is provided with flow valve, controls flow by regulation flow valve and makes the water yield of inflow header tank more than flowing into test
The water yield of case 1, the current of excess are overflowed into water-collecting tray 11 by header tank 8 top, and flow out from gap 10, in making proof box
Stable level.
Water at water source is first flowed into header tank 8 by the present invention, makes header tank 8 fill, and the valve then opening header tank 8 makes
Water in header tank 8 flows into proof box 1 by water inlet pipe 13, adjusts the water yield at water source and makes the water yield of inflow header tank 8 bigger
In the water yield of inflow proof box 1, then the water of excess overflows into water-collecting tray 11 from header tank 8 top, then from water-collecting tray 11
Gap 10 flows out, and the water that gap 10 flows out makes the stable level of header tank 8 at a certain setting height, header tank 8 water inlet
The water yield slightly larger than the water yield of outlet 12, make the stable level in proof box 1, and control the current stream flowing into proof box 1
Speed, thus can the impact on post grouting pile of the mould quasi stationary Groundwater Flow.
In order to process of the test provides stable flow rate of water flow, it is desirable to provide a stable head height.Meanwhile, can lead to
Overregulate the flow rate of water flow that height bracket simulation is different, i.e. simulate the impact on post grouting pile of the different groundwater velocities.
As shown in Figure 4, above-mentioned squeezing unit 5 includes agitator 14, pulp-absorbing pipe 15, mudjack 16 and the defeated slurry being sequentially connected with
Pipe 17, this feed pipe for mortar 17 is additionally provided with mud jacking valve 18 and defeated slurry Pressure gauge 19.
As it is shown in figure 1, simulation stake 3 upper end connects three way cock 20, in one end of this three way cock 20 and squeezing unit 5
Feed pipe for mortar 17 be connected, the other end is connected with slurry-returning device 21.Slurry-returning device 21 includes slurry storing tank 22 and return pipe 23, should
One end of return pipe 23 is stretched in slurry storing tank 22, and the other end is connected with three way cock 20；It is additionally provided with overfall on this return pipe 23
Valve 24 and overfall Pressure gauge 25, as shown in Figure 5.
The test method of the indoor long-term assay device of post grouting pile of a kind of simulated groundwater of present invention flowing, its feature exists
In, comprise the steps:
(1) soil sample is inserted in proof box 1, carries out compaction in layers, until design height, Model Pile 3 can pre-buried soil sample or
Squeeze in soil sample；
(2) dynamic Fluid Dynamics operation: be connected with proof box 1 by water inlet pipe 13 by header tank 8, is controlled flow at water source and makes
Flowing into the water yield water yield more than inflow proof box 1 of header tank, the current of excess are overflowed into water-collecting tray by header tank 8 top
11, and flow out from gap 10, make header tank 8 Water discharge flow speed reach stable level in design load, and proof box 1；
(3) mud jacking operation: use three way cock 20 that feed pipe for mortar 17, return pipe 23 and madjack pipe 26 connect formation one and return
Road, is respectively equipped with mud jacking valve 18 and overfall valve 24, first by overfall valve 24 during mud jacking on madjack pipe 26 and return pipe 23
Reach maximum, make serosity empty back in slurry storing tank 22, more slowly turn down overfall valve 24, make manometric reading reach requirement
Mud jacking pressure, then mud jacking valve 18 is opened, regulation mud jacking valve 18 makes pressure be basically stable at mud jacking force value, reduces pressure
Starch the undulatory property of pressure and protect precision pressure gauge；Model Pile 3 is carried out mud jacking, record during mud jacking mud jacking time,
Mud jacking amount, mud jacking pressure and slurry flow rate；
(4) long-term load operations: after mud jacking terminates and reaches intensity, by increasing counterweight charger 7 on lever bracket
Counterweight carries out bearingtest to Model Pile 3, persistently observes displacement at pile top situation of change at different time, detects Groundwater Flow
Under the conditions of the grouting result of pouring mortar pile.
Claims (7)
1. the indoor long-term assay device of the post grouting pile of simulated groundwater flowing, it is characterised in that: include proof box (1) and
Injecting the dynamic Fluid Dynamics device (2) of water flow simulation Groundwater Flow in this proof box (1), described proof box (1) is built-in with mould
Intending stake (3), the lower end of this simulation stake (3) offers slurry outlet (4), and the upper end of this simulation stake (3) connects to be had for cement injection
The squeezing unit (5) of slurry；Described proof box is provided with lever bracket (6), and this lever bracket (6) one end rotatably connects with proof box (1)
Connecing, the other end is unsettled, and this free end connects counterweight charger (7).
The indoor long-term assay device of post grouting pile of simulated groundwater the most according to claim 1 flowing, it is characterised in that:
Described dynamic Fluid Dynamics device (2) includes the header tank (8) at external water source and is used for fixing the height-adjustable type of this header tank (8)
Support (9), the outside of this header tank (8) is equipped with bottom and offers the water-collecting tray (11) of gap (10), the end of this header tank (8)
Portion offers outlet (12), and this outlet (12) injects current by water inlet pipe (13) in proof box (1)；Wherein control water
At source, flow makes the water yield water yield more than inflow proof box (1) of inflow header tank, and the current of excess are overflow by header tank (8) top
Go out to enter water-collecting tray (11), and flow out from gap (10), make proof box (1) interior stable level.
The indoor long-term assay device of post grouting pile of simulated groundwater the most according to claim 1 flowing, it is characterised in that:
Described squeezing unit (5) includes agitator (14), pulp-absorbing pipe (15), mudjack (16) and the feed pipe for mortar (17) being sequentially connected with, should
Defeated slurry Pressure gauge (19) it is additionally provided with on feed pipe for mortar (17).
The indoor long-term assay device of post grouting pile of simulated groundwater the most according to claim 3 flowing, it is characterised in that:
Described simulation stake (3) upper end connects three way cock (20), one end of this three way cock (20) and the defeated slurry in squeezing unit (5)
Pipe (17) is connected, and one end is connected with the madjack pipe (26) of simulation stake (3) top, and the other end is connected with slurry-returning device (21)
Connect；And madjack pipe (26) is provided with mud jacking valve (18).
The indoor long-term assay device of post grouting pile of simulated groundwater the most according to claim 4 flowing, it is characterised in that:
Described slurry-returning device (21) includes slurry storing tank (22) and return pipe (23), and slurry storing tank (22) is stretched in one end of this return pipe (23)
In, the other end is connected with three way cock (20)；Overfall valve (24) and overfall Pressure gauge it is additionally provided with on this return pipe (23)
(25)。
6. the indoor long-term assay device of post grouting pile flowed according to the simulated groundwater described in claim 4 or 5, its feature exists
In: described counterweight charger (7) is the counterweight basket that can arbitrarily increase and decrease counterweight.
7. the test of the indoor long-term assay device of post grouting pile flowed according to the arbitrary described simulated groundwater of claim 1-6
Method, it is characterised in that comprise the steps:
(1) soil sample is inserted in proof box (1), carries out compaction in layers, until design height, Model Pile (3) can pre-buried soil sample or
Squeeze in soil sample；
(2) dynamic Fluid Dynamics operation: header tank (8) is connected with proof box (1) by water inlet pipe (13), controls flow at water source
Making the water yield water yield more than inflow proof box (1) of inflow header tank, the current of excess are overflowed into collection by header tank (8) top
Water pond (11), and flow out from gap (10), make header tank (8) Water discharge flow speed reach design load, and proof box (1) interior water level is steady
Fixed；
(3) mud jacking operation: use three way cock (20) that feed pipe for mortar (17), return pipe (23) and madjack pipe (26) are connected formation one
Individual loop, is respectively equipped with mud jacking valve (18) and overfall valve (24) on madjack pipe (26) and return pipe (23), during mud jacking first
Overfall valve (24) is reached maximum, makes serosity empty back in slurry storing tank (22), more slowly turn down overfall valve (24), make pressure
The reading of power table reaches the mud jacking pressure of requirement, then is opened by mud jacking valve (18), and regulation mud jacking valve (18) makes pressure basic
Stable in mud jacking force value；Model Pile (3) is carried out mud jacking, during mud jacking, records the time of mud jacking, mud jacking amount, mud jacking pressure
Power and slurry flow rate；
(4) long-term load operations: after mud jacking terminates and reaches intensity, by increasing the weight of counterweight charger (7) on lever bracket
Code carries out bearingtest to Model Pile (3), persistently observes displacement at pile top situation of change at different time, detects Groundwater Flow
Under the conditions of the grouting result of pouring mortar pile.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610585670.3A CN106248495B (en) | 2016-07-25 | 2016-07-25 | Long-term experimental rig and its test method in the post grouting pile room of simulated groundwater flowing |
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| CN201610585670.3A CN106248495B (en) | 2016-07-25 | 2016-07-25 | Long-term experimental rig and its test method in the post grouting pile room of simulated groundwater flowing |
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Cited By (5)
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| CN108956316A (en) * | 2018-07-09 | 2018-12-07 | 华中科技大学 | A kind of Large Deformation Consolidation and contaminant transportation coupling test loading device and platform |
| CN108956105A (en) * | 2018-05-16 | 2018-12-07 | 福州大学 | Technology of Deepwater Mooring System body bearing capacity simulation test device and test method |
| CN113756736A (en) * | 2021-08-30 | 2021-12-07 | 南京东土建设科技有限公司 | Pile foundation post-grouting system based on drilling slag recycling and construction method |
| CN115324126A (en) * | 2022-08-16 | 2022-11-11 | 中国水利水电第七工程局有限公司 | Stirring pile test device for indoor simulation of underground water flow and use method thereof |
| CN115434378A (en) * | 2022-08-12 | 2022-12-06 | 青岛理工大学 | Single-phase method automatic grouting system and method for energy pile in EICP (electronic engineering and environmental protection) mineralization environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115434378A (en) * | 2022-08-12 | 2022-12-06 | 青岛理工大学 | Single-phase method automatic grouting system and method for energy pile in EICP (electronic engineering and environmental protection) mineralization environment |
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| CN115324126A (en) * | 2022-08-16 | 2022-11-11 | 中国水利水电第七工程局有限公司 | Stirring pile test device for indoor simulation of underground water flow and use method thereof |
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| CN106248495B (en) | 2019-05-07 |
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