CN208183816U - A kind of default section support pile experimental rig for simulating different bending strengths - Google Patents
A kind of default section support pile experimental rig for simulating different bending strengths Download PDFInfo
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- CN208183816U CN208183816U CN201721141061.5U CN201721141061U CN208183816U CN 208183816 U CN208183816 U CN 208183816U CN 201721141061 U CN201721141061 U CN 201721141061U CN 208183816 U CN208183816 U CN 208183816U
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Abstract
The utility model discloses a kind of default section support pile experimental rigs for simulating different bending strengths, the process continuously destroyed for simulating foundation pit supporting pile, including prefabricated broken pile, gasket, nut, band eye nylon bolt, hinge fastener, hinge and wirerope, the upper half stake and lower half stake are divided by default stake section in the middle part of the prefabricated broken pile, it is connected by the hinge fastener with hinge between the upper half stake on the inside of foundation pit and lower half stake, the band eye nylon bolt is installed respectively in the upper half stake and lower half stake on the outside of foundation pit, bolt eye with eye nylon bolt described in the steel wire penetrating is simultaneously fixed by the gasket and nut.The present utility model can work normally in the excavation of foundation pit stage as common support pile, and the process that foundation pit continuously destroys can be simulated after preset support pile fracture of breaking.
Description
Technical field
The utility model relates to one of geotechnical engineering experimental rigs, are several in a kind of simulation foundation pit specifically
Support pile destroys the device for causing foundation pit continuously to collapse, by this device it can be concluded that the transport mechanism that foundation pit continuously destroys.
Background technique
The ground such as a large amount of great foundation pit collapse accidents, such as Singapore, Hangzhou, Cologne had occurred both at home and abroad in recent years, made
At loss very serious.Find that the unstable failure of foundation pit is an extremely complex process, is especially existed according to these accidents
In the case that foundation pit is deep, big, flat shape is irregular or supporting construction is complicated, destruction then may be by a certain local failure
Cause, and then development evolvement is the mode of a variety of destructions, it is also possible to be drawn by local Support structure damage or local sediment failure
It rises, and then causes periphery supporting construction until the mode collapsed on a large scale, the i.e. process of collapsing of deep basal pit are a continuous destructions
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 the most weak position (i.e. there are the positions of notch for ground-connecting-wall from for 66kV cable) in part that foundation pit, 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,
It destroys after stopping 2 minutes, collapses and start to develop along foundation pit length direction, until collapsing to except 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 explosion, earthquake,
Continuous collapse research under the emergency cases such as fire, shock have been relatively mature, and research means are also very abundant, including theory pushes away
It leads, model test and numerical simulation etc., while many countries and regions are to the progressive collapse-resisting design construction of superstructure
Relevant specification and directive document.Compared with the research for 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 pit stability disruption mode
Deng) obviously it can not reflect the characteristics of deep basal pit continuously destroys and mechanism, while can not also be mentioned for the research of its control method
For enough supports, therefore, the generation and Evolution Mechanism that this great underground engineering disasters are continuously destroyed to deep basal pit carry out deep
Entering research, extremely it is necessary to the destruction for only disclosing local failure initiation is sent out along the transmitting of 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 pit 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
Method, limit analysis method, conventional the methods of elasto-plastic finite element method and Strength Reduction Method can only mostly be related to foundation pit to destroy
Critical state, as the development and differentiation destroyed after starting, these conventional methods are difficult to simulate and describe.Therefore, it is
The continuous destruction of research deep basal pit, continuously damage study means are also badly in need of for reasonable large deformation calculation method and model test etc.
It explores.
The research of large-scale physical model test, numerical simulation is passed through at present, and by the way that the support pile mould that can break is arranged
Intend the process that foundation pit locally collapses, discovery foundation pit locally collapses and can cause the growth of adjacent support pile moment of flexure certain multiple, but
Rectangle PVC intensity used in pre-stage test is too big, can not simulate the process of foundation pit continuous collapse, needs further exploratory experiment side
Method, to simulate the process of foundation pit continuous collapse.
Utility model content
The purpose of this utility model is to overcome deficiency in the prior art, solve to simulate in model test by foundation pit office
Portion's support pile destroys and causes the problem of foundation pit supporting pile continuously destroys along its length, provides a kind of simulation different bending strengths
Default section support pile experimental rig, the utility model can work normally in the excavation of foundation pit stage as common support pile,
The process that foundation pit continuously destroys can be simulated after preset support pile fracture of breaking.
The purpose of this utility model is achieved through the following technical solutions:
A kind of default section support pile experimental rig for simulating different bending strengths, continuously breaks for simulating foundation pit supporting pile
Bad process, including prefabricated broken pile, gasket, nut, band eye nylon bolt, hinge fastener, hinge and wirerope, it is described prefabricated
The upper half stake and lower half stake are divided by default stake section in the middle part of broken pile, the upper half stake and lower half stake on the inside of foundation pit
Between be connected by the hinge fastener with hinge, installed respectively in the upper half stake and lower half stake on the outside of foundation pit
The band eye nylon bolt, the bolt eye with eye nylon bolt described in the steel wire penetrating are simultaneously solid by the gasket and nut
It is fixed.
Further, by prefabricated broken pile on the inside of the foundation pit it is different with the stress on the outside of foundation pit be respectively divided into compression-side and by
Draw side.
Further, by adjusting failure test while the experimental rig quantity analog difference number support pile.
Further, the prefabricated broken pile is made of aluminum, irony, stainless steel or PVC any material therein
Rectangular configuration.
Compared with prior art, beneficial effect brought by the technical solution of the utility model is:
1. by presetting truncation surface, and the compression-side benefit of two-section broken pile is hinged, and tension side utilizes finer wire
Rope connection simulates Row Piles Supporting Structure and destroys in initial local support pile and cause the destruction for closing on support pile, realizes continuous
The simulation of destruction.
2. the ultimate tensile strength of support pile is simulated by the tensile strength for adjusting wirerope, in combination with actual condition and root
It factually tests demand and adjusts the intensity of support pile, and it is continuous broken to realize that support pile is caused under horizontal soil arching effect by local failure
It is bad.
3. prefabricated broken pile compression-side is hinged, hinge can both undertake the shearing of this default section part, prevent from being cut
It destroys, and can be freely rotated when this section reaches capacity moment of flexure, generation destruction, simulation stake fractures；
4. realizing support pile under moment of flexure control due to simulation that loading effect and Unloading Effect destroy.
5. utility model device overall structure is simple, practical reliable, convenient for operating and being easily achieved, for simulating foundation pit
It excavates and support pile local failure causes the model investigation continuously destroyed and has great importance.
Detailed description of the invention
Fig. 1 is utility model diagram and its partial enlargement schematic cross-sectional view；
Fig. 2-1 and Fig. 2-2 is respectively the positive structure diagram of utility model device tension side, compression-side；
Fig. 3 is foundation pit schematic diagram of the utility model in test.
Each device in figure are as follows: 1, gasket, 2, nut, 3, band eye nylon bolt, 4, hinge fastener, 5, hinge, 6, steel wire
Rope, 7, the upper half stake, 8, lower half stake
Specific embodiment
The utility model will be further described with reference to the accompanying drawing.
As shown in Figure 1 to Figure 3, a kind of default section support pile experimental rig for simulating different bending strengths, for simulating
The process that foundation pit supporting pile continuously destroys, including prefabricated broken pile, gasket 1, nut 2, band eye nylon bolt 3, hinge fastener 4,
Hinge 5 and wirerope 6, prefabricated broken pile middle part are divided into the upper half stake 7 and lower half stake 8 by default stake section, are located in foundation pit
It is connected by hinge fastener 4 with hinge 5 between the upper half stake 7 and lower half stake 8 of side, the upper half on the outside of foundation pit
Installation band eye nylon bolt 3, wirerope 6 pass through the bolt eye with eye nylon bolt 3 and pass through respectively in stake 7 and lower half stake 8
Gasket 1 and nut 2 are fixed.
The application method of utility model device during the test is as follows:
1. upper and lower half stake is docking together, it connect with hinge fastener with hinge, the compression of lower half stake
Nut is tightened with the screw eye of the steel wire penetrating band eye nylon bolt of some strength in side, and formation one complete originally practical new
Type specific implementation device.
2. the utility model of certain amount is placed on pre-position again, model test soil body is prepared.
3. debugging after setting up test monitoring equipment, carries out testing normal excavation, at this time utility model device and remaining branch
Fender pile constitutes cantilever style campshed supporting together, stops excavating after normal excavation to predetermined depth, and carry out every Testing index
Detection.
4. controlling preset initial destruction stake to destroy, simulation foundation pit part support pile collapses, and causes several basic realities
It is broken with new device, until continuous collapse stops.
In specific implementation process, the utility model selects rectangle PVC by certain rigidity likelihood ratio, and it is disconnected to preset support pile
Face, and define by pile body stress that prefabricated broken pile is located on the inside of foundation pit, outside is respectively compression-side, tension side, in foundation pit test
Normal to excavate the stage, tension side is transmitted between broken pile up and down by the axle power between broken pile above and below wire rope transfers, compression-side by hinge
The utility model of certain amount is disposed adjacent at default local failure position by axle power and shearing, i.e., intact with remaining
Support pile has together constituted with cantilever style Row Piles Supporting Structure；It is disconnected by controlling the support pile that can break after the normal excavation stage
It splits and support pile destruction in foundation pit part is simulated, thus cause the growth for destroying close position the utility model pile body stress,
Tension side wirerope is broken, and the utility model the upper half stake is collapsed into foundation pit, has caused foundation pit branch by the destruction of local support pile
The continuous collapse of fender pile is finally stopped until collapsing.
The above are the application methods of experimental rig simulation foundation pit local failure, are strained by pasting on the utility model
Piece can be used for measuring bending；By monitoring stake, soil pressure cell, the default support pile that can break in the utility model and test
It is used in conjunction with, can successfully simulate the transmitting and termination that foundation pit continuously destroys, obtain the machine that load transmits when foundation pit continuously destroys
Reason.
Compared with existing experimental rig, difference is the utility model:
It is connected by presetting stake section, and by two sections of stakes, that is, upper and lower half stake tension side using seizing wire, it is combinable
Actual condition and the intensity that support pile is adjusted according to experiment demand, wirerope are securely fixed in stake section two sides using nut
Stake surface, can avoid the sliding in tension.And the compression-side of prefabricated broken pile is hinged, it is disconnected that hinge can both undertake this default stake
Shearing at face prevents sheared destruction, and can be freely rotated when this section reaches capacity moment of flexure, generation destruction, simulates stake
It fractures, this is that existing model support pile institute is irrealizable.Existing foundation pit tests common support pile and often uses aluminum or hard PVC
Rectangular tube simulation, but complete PVC Model Pile intensity is higher, it can not be suffered in the continuous damage model test of campshed supporting foundation pit
To load within the scope of destroy.And the utility model may be implemented initial local support pile and destroy the neighbouring support pile of initiation
It destroys, that is, realizes continuous crash simulation, and support pile may be implemented under horizontal soil arching effect by the continuous of local failure initiation
It destroys.
Utility model device is ingenious in design, simple but powerful, convenient for operation, tests the repeatability of process
It is good, it can satisfy the needs of various sand class excavation models tests.
Although the test process of the utility model is described above, the utility model uses function not office
It is limited to above-mentioned specific embodiment, the above mentioned embodiment is only schematical, is not restrictive, this field
Those of ordinary skill under the enlightenment of the utility model, do not departing from the utility model aims and claimed model
In the case of enclosing, it can also be used for the model test that other supporting construction foundation pits continuously destroy, it is practical new that these belong to this
The protection scope of type.
Claims (4)
1. a kind of default section support pile experimental rig for simulating different bending strengths, is continuously destroyed for simulating foundation pit supporting pile
Process, which is characterized in that including prefabricated broken pile, gasket, nut, band eye nylon bolt, hinge fastener, hinge and steel wire
Rope, the prefabricated broken pile middle part are divided into the upper half stake and lower half stake by default stake section, the upper half on the inside of foundation pit
It is connected by the hinge fastener with hinge between stake and lower half stake, the upper half stake and lower half on the outside of foundation pit
The band eye nylon bolt is installed respectively, the bolt eye with eye nylon bolt described in the steel wire penetrating simultaneously passes through described in stake
Gasket and nut are fixed.
2. a kind of default section support pile experimental rig for simulating different bending strengths, feature exist according to claim 1
In, it is different with the stress on the outside of foundation pit on the inside of foundation pit by prefabricated broken pile, it is respectively divided into compression-side and tension side.
3. a kind of default section support pile experimental rig for simulating different bending strengths, feature exist according to claim 1
In by adjusting failure test while the experimental rig quantity analog difference number support pile.
4. a kind of default section support pile experimental rig for simulating different bending strengths, feature exist according to claim 1
In the prefabricated broken pile is the rectangular configuration being made of aluminum, irony, stainless steel or PVC any material therein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721141061.5U CN208183816U (en) | 2017-09-07 | 2017-09-07 | A kind of default section support pile experimental rig for simulating different bending strengths |
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| CN201721141061.5U CN208183816U (en) | 2017-09-07 | 2017-09-07 | A kind of default section support pile experimental rig for simulating different bending strengths |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761785A (en) * | 2017-09-07 | 2018-03-06 | 天津大学 | A kind of default section support pile experimental rig for simulating different bending strengths |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761785A (en) * | 2017-09-07 | 2018-03-06 | 天津大学 | A kind of default section support pile experimental rig for simulating different bending strengths |
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