CN207148105U - By instructing the support pile experimental rig destroyed in excavation models experiment - Google Patents
By instructing the support pile experimental rig destroyed in excavation models experiment Download PDFInfo
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- CN207148105U CN207148105U CN201721084872.6U CN201721084872U CN207148105U CN 207148105 U CN207148105 U CN 207148105U CN 201721084872 U CN201721084872 U CN 201721084872U CN 207148105 U CN207148105 U CN 207148105U
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Abstract
The utility model discloses a kind of support pile experimental rig destroyed in excavation models experiment by instruction, for simulating the transmission of foundation pit supporting pile local failure in the longitudinal direction so as to triggering the mechanism continuously destroyed, including prefabricated broken pile, magnet, linear bearing, steel shaft, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile includes the upper half stake and lower half stake, the junction center of the upper half stake and lower half stake is respectively fixed with a linear bearing, the steel shaft is slidably connected in the linear bearing, it is used to prevent steel shaft from falling because of deadweight at the top of the steel shaft that the magnet is arranged in the upper half stake；Steel shaft bottom is provided with the piston rod of the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder in the lower half stake, and the prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.The utility model can accomplish to result of the test disturb it is less, destroyed while different number support piles can be simulated.
Description
Technical field
The utility model is related to a kind of experimental rig in Geotechnical Engineering, if in particular it relates in a kind of research foundation ditch by
The model test apparatus that foundation ditch caused by dry root support pile destroys locally collapses and continuously collapsed.
Background technology
Made both at home and abroad there occurs a large amount of great foundation ditch collapse accidents, such as the ground such as Singapore, Hangzhou, Cologne in recent years
Into very serious loss.Find that the unstable failure of foundation ditch is an extremely complex process, is especially existed according to these accidents
In the case that foundation ditch is deep, big, flat shape is irregular or supporting construction is complicated, its destruction is probably then by a certain local failure
Cause, and then development evolvement is the pattern of a variety of destructions, it is also possible to drawn by local Support structure damage or local sediment failure
Rise, and then cause periphery supporting construction until the pattern collapsed on a large scale, i.e. the process of collapsing of deep basal pit is a continuous destruction
Process.
According to the record of Singapore's Nicoll Highway subway foundation pit accident destructive process it can be found that growing nearly hundred meters
It is since local most weak position (i.e. 66kV cables ground-connecting-wall from has the position of breach) that foundation ditch, which collapses,.Incident
The same day, ground-connecting-wall indentation, there the 9th support (S335) purlin and support disengage first, and cause herein ground-connecting-wall collapse,
Destroy after stopping 2 minutes, beginning of caving in develops along foundation ditch length direction, until collapsing to outside 100m.A large amount of foundation pit accident hairs
After life, the investigation and summary of many accidents still can ignore the continuous failure mechanism of accident.
In structural engineering field, for the constructions of structures such as multi-rise building, large-span structure and bridge blast, earthquake,
Continuous collapse research under the emergency cases such as fire, shock is more ripe, and research meanses are also very abundant, including theory pushes away
Lead, model test and numerical simulation etc., while many countries and regions are to the progressive collapse-resisting design construction of superstructure
Related specification and directive document.Compared with research with continuously destroying problem in Structural Engineering has been achieved with remarkable break-throughs, mesh
The research that preceding Geotechnical Engineering field is continuously destroyed is also seldom, and does not cause due attention also.
(monolithic stability destruction, overturning, bottom heave destroys and skirt destroys for current foundation ditch stability disruption pattern
Deng) it obviously can not reflect the characteristics of deep basal pit continuously destroys and mechanism, while can not also be carried for the research of its control method
For enough supports, therefore, the generation for destroying this great underground engineering disasters continuous to deep basal pit carries out deep with Evolution Mechanism
Entering research is extremely necessary, only discloses transmission hair of the destruction of local failure initiation along foundation depth, width, length direction
Mechanism and natural termination mechanism are opened up, and establishes the quantitatively evaluating index and evaluation method of evaluation foundation ditch continuous collapse possibility,
Energy proposes to prevent the theory and design method of foundation pit supporting construction progressive collapse-resisting.
The problem of due to the continuous destruction of deep basal pit being a large deformation, non-linear, multi- scenarios method, existing limiting equilibrium
The methods of method, limit analysis method, conventional elasto-plastic finite element method and Strength Reduction Method, which can only mostly be related to foundation ditch, to destroy
Critical condition, as the development and differentiation destroyed after starting, these conventional methods are difficult to simulate and describe.Therefore, it is
Continuously damage study means are also badly in need of for the continuous destruction of research deep basal pit, rational large deformation computational methods and model test etc.
Explore.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, there is provided a kind of to lead in excavation models experiment
The support pile experimental rig that instruction destroys is crossed, solves the problems, such as that local support pile is simulated in continuous damage model test to be destroyed,
It can accomplish less to result of the test disturbance；The utility model not waited using number simultaneously, can simulate different number supportings
Destroyed while stake.
The purpose of this utility model is achieved through the following technical solutions：
A kind of support pile experimental rig destroyed in excavation models experiment by instruction, for simulating foundation pit supporting pile office
Portion destroys transmission in the longitudinal direction so as to trigger the mechanism continuously destroyed, including prefabricated broken pile, magnet, linear bearing, steel
Axle, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile include the upper half stake and lower half stake, the upper half stake and
The junction center of lower half stake is respectively fixed with a linear bearing, and the steel is slidably connected in the linear bearing
Axle, the steel shaft top that the magnet is arranged in the upper half stake are used to prevent steel shaft from falling because of deadweight；The lower half stake
Interior steel shaft bottom is provided with the piston rod of the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder, described
Prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.
Further, the frictional force between the steel shaft and the linear bearing is less than the gravity of steel shaft.
Further, failure test while different number support piles can be simulated by adjusting the experimental rig quantity.
Further, the prefabricated broken pile is made up of aluminum, irony, stainless steel or PVC any materials therein
Rectangular configuration.
Compared with prior art, beneficial effect caused by the technical solution of the utility model is：
1. realize the controllability that pile body invalid position during local failure occurs for Row Piles Supporting Structure.
2. using different number of the utility model experimental rig simultaneously, and it is arranged according to simulation demand, Ke Yishi
Destroyed while existing varying number, diverse location support pile.
3. realizing crash simulation of the support pile under different excavation of foundation pit depth, soil pressure in excavation models experiment is overcome
The smaller contradiction with support pile intensity between higher of power.
4. using the steel shaft connection broken pile of carry magnet, it is ensured that the Model Pile destroyed before occurring, which has, meets supporting demand
Strength and stiffness.
5. realizing the acceptable instruction of Model Pile by control of the magnetic valve to cylinder inner push-rod to fracture, examination can be made
Part destroys in the range of less load.
It is practical reliable 6. the utility model device overall structure is simple, it is easy to operation and be easily achieved, for simulating foundation ditch
The model investigation of Row Piles Supporting Structure destructive process is significant under excavation and smaller soil disturbance.
Brief description of the drawings
Fig. 1 is schematic cross-section when the upper and lower half stake of the utility model links together；
Fig. 2 is schematic diagram when upper lower half stake separates after the utility model cylinder is released；
Fig. 3 is foundation ditch schematic diagram when the utility model is tested；
Reference：1st, the upper half stake, 2, magnet, 3, linear bearing, 4, lower half stake, 5, steel shaft, 6, steel wire rope, 7, gas
Cylinder counter-force block, 8, cylinder, 9, magnetic valve
Embodiment
The utility model will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, in simulation foundation ditch local failure and the model test continuously destroyed, complete model examination
Test the rectangular pile that prefabricated broken pile is usually the plastic materials such as aluminum, irony, stainless steel or PVC.Because excavation models test size
Much smaller than the size of Practical Project, the soil pressure suffered by support pile is smaller, therefore complete support pile is difficult the institute in model test
Destroyed in the range of the load being subject to.It is locally broken that the support pile that receiving instruction destroys can be used in simulation foundation pit supporting pile
Bad transmission in the longitudinal direction is so as to triggering the mechanism continuously destroyed.In the normal excavation stage of foundation ditch experiment, prefabricated broken pile
Including the upper half stake 1 and lower half stake 4, the junction center of the upper half stake 1 and lower half stake 4 is respectively fixed with one directly
Bobbin holds 3, and steel shaft 5 is slidably connected in linear bearing 3, and the top of steel shaft 5 that magnet 2 is arranged in the upper half stake 1 is used to prevent
Steel shaft 5 is fallen because of deadweight；The bottom of steel shaft 5 is provided with cylinder counter-force block 7 and cylinder 8 in lower half stake 4, and steel wire rope 6 connects cylinder
Piston rod and steel shaft 5, prefabricated broken pile are externally provided with the magnetic valve 9 for controlling cylinder.
Steel shaft 5 is to transmit the moment of flexure between upper and lower half stake, and its stress and deformation characteristic are close to complete model stake；Just
After the normally opened digging stage terminates, by controlling magnetic valve 9 to inflate cylinder moment, cylinder push-rod ejects immediately, will by steel wire rope 6
Steel shaft 5 draws in lower half stake, and the upper half stake 1 and the two-section stake of lower half stake 4 disconnect, and the broken of foundation ditch part support pile is simulated with this
It is bad.
The step of being tested by the utility model experimental rig is as follows：
1. upper and lower half stake is docking together, steel shaft, then the utility model by some numbers are held with upper magnet
Device is placed on foundation ditch precalculated position with common support pile, prepares model test soil body；
2. debugging, setting up test monitoring equipment, carry out testing the normal excavation stage, now the utility model and common supporting
Stake forms cantilever style campshed supporting together, stops excavating after normally excavating to desired depth and monitors；
3. the air inlet of magnetic valve is connected into upper cylinder, cylinder is pressurized to predetermined pressure, opens cylinder gas outlet；
4. power of electromagnetic valve, the utility model upper and lower half after the completion of test monitoring equipment debugging, erection, will be connected again
Stake separation is cut, because soil pressure acts on after stake, the upper half stake is collapsed into foundation ditch.
The application method of foundation ditch local failure is simulated for the experimental rig above, by the utility model with being monitored in experiment
Stake, soil pressure cell and subsequent burst stake are used in conjunction with, and are successfully simulated transmittance process and termination situation that foundation ditch continuously destroys, are obtained
The mechanism of load transmission when foundation ditch continuously destroys is gone out.
The utility model is not limited to embodiments described above.The description to embodiment is intended to describe above
With explanation the technical solution of the utility model, above-mentioned embodiment is only schematical, is not restricted.
In the case of not departing from the utility model aims and scope of the claimed protection, one of ordinary skill in the art is in this practicality
The specific conversion of many forms can be also made under new enlightenment, these are belonged within the scope of protection of the utility model.
Claims (4)
1. by instructing the support pile experimental rig destroyed in excavation models experiment, for simulating foundation pit supporting pile local failure
Transmission in the longitudinal direction is so as to triggering the mechanism continuously destroyed, it is characterised in that including prefabricated broken pile, magnet, linear axis
Hold, steel shaft, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile include the upper half stake and lower half stake, described the upper half
The junction center of stake and lower half stake is respectively fixed with a linear bearing, is slidably connected in the linear bearing
Steel shaft is stated, is used to prevent steel shaft from falling because of deadweight at the top of the steel shaft that the magnet is arranged in the upper half stake；The lower half
The piston rod that steel shaft bottom in stake is provided with the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder is cut,
The prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.
2. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In the frictional force between the steel shaft and the linear bearing is less than the gravity of steel shaft.
3. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In failure test while can simulating different number support piles by adjusting the experimental rig quantity.
4. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In the prefabricated broken pile is the rectangular configuration being made up of aluminum, irony, stainless steel or PVC any materials therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721084872.6U CN207148105U (en) | 2017-08-28 | 2017-08-28 | By instructing the support pile experimental rig destroyed in excavation models experiment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721084872.6U CN207148105U (en) | 2017-08-28 | 2017-08-28 | By instructing the support pile experimental rig destroyed in excavation models experiment |
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| CN207148105U true CN207148105U (en) | 2018-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107367598A (en) * | 2017-08-28 | 2017-11-21 | 天津大学 | By instructing the support pile experimental rig destroyed and method in excavation models experiment |
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2017
- 2017-08-28 CN CN201721084872.6U patent/CN207148105U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107367598A (en) * | 2017-08-28 | 2017-11-21 | 天津大学 | By instructing the support pile experimental rig destroyed and method in excavation models experiment |
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