CN203498875U - Pile top intelligent regulator capable of changing rigidity into flexibility automatically - Google Patents
Pile top intelligent regulator capable of changing rigidity into flexibility automatically Download PDFInfo
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- CN203498875U CN203498875U CN201320335272.8U CN201320335272U CN203498875U CN 203498875 U CN203498875 U CN 203498875U CN 201320335272 U CN201320335272 U CN 201320335272U CN 203498875 U CN203498875 U CN 203498875U
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Abstract
The utility model discloses a pile top intelligent regulator capable of changing rigidity into flexibility automatically. The regulator is in a tubular shape formed by an upper cushion plate, a lower cushion plate and a vertical component arranged between the upper cushion plate and the lower cushion plate; the vertical component is at least formed by a telescopic element which has an ideal or a quasi-ideal elastic (rigid) plastic stress-strain relationship when the telescopic element is compressed uniaxially and is made of a metal material. The vertical component can be directly formed by the telescopic element which defines a cylinder wall, and can also be a structure which is formed by a support side wall which defines the cylinder wall and the telescopic element placed in the cylinder, wherein the support side wall can be made of the same metal material as the telescopic element, or can be made of a material with higher deformation capacity than that of the telescopic element. The pile top intelligent regulator is simple in structure and convenient to implement; the vertical stress can be controlled automatically, the rigidity can be changed automatically and the compression deformation amount of the pile top intelligent regulator can be regulated automatically according to the design intent and the actual deformation situation of the bottom of a pile after the pile top intelligent regulator is installed.
Description
Technical field
The utility model relates to analysis of pile-raft foundation technical field, and especially a kind of vertical rigidity can push up stressed and displacement intelligent control device by the just stake to soft automatic conversion.
Background technology
Last decade, the composite pile foundation design theory of considering the native shared top-out load of stake makes significant progress, especially invention and the application of stake top deformation adjustment device (ZL200510040317.9), has started and has held the beginning of holding the theoretical research of type composite pile foundation.Due to this invention, since 2003, more than ten, the ground such as Xiamen high-rise, super highrise building project, build and form by means of composite pile foundation technology, and obtain immense success, obtains significant social and economic benefits.
Yet because the vertical rigidity of above-mentioned stake top deformation adjustment device is definite value, its regulating power for the displacement of stake top is more limited, generally in pure end bearing pile (or pure friction pile) composite pile foundation, effect is better.When needs are built high level, super highrise building on serious inhomogeneous ground, may there is friction pile and end bearing pile under same raft plate the situation of depositing, at this moment as adopted above-mentioned stake top deformation adjustment device design pile-raft foundation, just there will be certain difficulty, cannot implement even at all.
In recent years, someone proposes to arrange on stake top the two stages change stiffness design method of cavity or soft readjustment device.But need manual operation owing to becoming rigidity, not only its time point is difficult to determine, and after becoming rigidity, adjuster just completely loses regulating power, causing later stage top to load the differential settlement producing cannot eliminate, therefore, and the method so far there are no practical application.
Utility model content
Technical problem to be solved in the utility model is for the deficiencies in the prior art, the just rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation is provided, this simple structure, enforcement is the stressed and displacement intelligent control device in stake top easily, after being installed, can, according to the intention of design and a stake end practical distortion situation, automatically control vertical applied force, automatically change rigidity, automatically regulate the compress variation of self.
For achieving the above object, technical solutions of the utility model are:
A kind of elder generation is the soft stake top intelligent control device from becoming rigidity just, this modulator is arranged between raft plate and stake. and this modulator forms a tubular by upper and lower backing plate and the vertical member that is arranged between upper and lower backing plate, described vertical member has that telescopic element that the metal material of desirable or accurate ideal elastic-plastic stress-strain relation makes forms during at least by a uniaxial compression, or described vertical member has that telescopic element that the metal material of desirable or accurate ideal rigid plastic stress strain stress relation makes forms during at least by a uniaxial compression.
Further, described telescopic element surrounds barrel; Or described vertical member also comprises that one surrounds the supporting side walls of barrel, described telescopic element is placed in cylinder.
Further, described supporting side walls is to have the supporting side walls that the metal material of desirable or accurate ideal elastic-plastic stress-strain relation is made during by a uniaxial compression, or described supporting side walls is to have the supporting side walls that the metal material of desirable or accurate ideal rigid plastic stress strain stress relation is made during by a uniaxial compression.
Further, described supporting side walls is the supporting side walls of being made by mild steel or other flexible metal.
Further, described telescopic element is one or more.
Further, described telescopic element is Low Yield Point Steel.
The usefulness of technique scheme is:
For solving pile soil common action problem under serious inhomogeneous geology condition, the utility model especial manufacture goes out a kind of vertical rigidity can push up stressed and displacement modulator by the just intelligent stake to soft automatic transformation.When supporting side walls adopts the material identical with telescopic element to make, it is exactly a part for telescopic element, jointly participates in intelligent control work; When supporting side walls adopts the material more soft than telescopic element, during as mild steel or the making of other flexible metal, it just only plays a supportive role, and does not participate in intelligent control work.After this modulator is arranged between raft plate and stake, when the vertical applied force of stake does not reach its characteristic value, the telescopic element of modulator is in elastic stage, and deflection is minimum, and almost non-displacement is pushed up in stake; When the vertical applied force of stake reaches after characteristic value, modulator telescopic element enter yield point elongation or weak strain hardening stage, vertical applied force do not increase or micro-increasing situation under, compressive strain constantly increases, thereby a top displacement is continued to increase, and drive raft plate to move down, impel foundation soil to bring into play gradually carrying effect, until the vertical applied force of foundation soil is while reaching its characteristic value.The utility model stake top intelligent control device can be controlled the stressed of foundation pile automatically according to the intention of design, makes it to maintain near design predetermined value; Can automatically change vertical rigidity at the desired time point of design, make it by just becoming soft, and produce larger compressive strain, impel stake top to produce appropriate displacement, to drive raft plate to move down compression foundation soil, realize stake, native coefficient object; Can automatically regulate the deflection of vertical member according to the soft or hard at the bottom of stake and practical distortion situation, to impel, the stake top displacement between dissimilar stake-end bearing pile and friction pile under raft plate is consistent, co-operation.
Therefore, the utility model is the just rear soft proposition from becoming the stake top intelligent control device of rigidity first, both solved the problem high-rise under special complex geological condition, how super highrise building implements composite pile foundation, make again the enforcement of composite pile foundation become more simple, safety, economy, rationally, have more compliance widely.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model stake top intelligent control device;
Fig. 2 is the utility model vertical member structural representation.
The specific embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
A kind of elder generation is as shown in Figure 1, 2 the soft stake top intelligent control device from becoming rigidity just, and this modulator is arranged between raft plate 1 and stake 5.This modulator forms a tubular by upper and lower backing plate 2,4 and the vertical member 3 that is arranged between upper and lower backing plate 2,4, and vertical member 3 has that telescopic element that the metal material of ideal or accurate desirable bullet (just) plastic stress strain stress relation makes forms during at least by a uniaxial compression.Described telescopic element can be set to one or more.
Described vertical member 3 can directly consist of the telescopic element that surrounds barrel, also can be as shown in Figure 2, vertical member 3 surrounds the supporting side walls 31 of barrel by one, and is placed in the structure that the telescopic element 32 in cylinder forms, and telescopic element 32 can be one or more solid columns or hollow tubular.
The utility model telescopic element has the metal material of ideal or accurate desirable bullet (just) plastic stress strain stress relation while adopting uniaxial compression, as Low Yield Point Steel, be made; Upper and lower backing plate 2,4 adopts common shaped steel or cast iron to make, simultaneously upper and lower backing plate 2,4 welds with the telescopic element that surrounds barrel, or as shown in Figure 2, upper and lower backing plate 2,4 and surround supporting side walls 31 welding of barrel, supporting side walls 31 adopts the metal material identical with telescopic element to make, or the material that adopts deformability to be better than telescopic element deformability makes, as mild steel or other flexible metal.
When the telescopic element in vertical member 3 or telescopic element and supporting side walls all adopt Low Yield Point Steel to make, the yield strength of cross-sectional area=vertical bearing capacity of single pile characteristic value/steel that it is total, i.e. At=Ra/ σ s.Its height H t gets 300-500mm, because the maximum strain of Low Yield Point Steel is generally greater than 0.4, therefore more than the maximum compression displacement that vertical member 3 produces can reach 100 mm.
When the utility model stake top intelligent control device uses, the load of superstructure is applied on upper padding plate 2 by raft plate 1, then passes to vertical member 3, then passes to lower bolster 4, finally passes to stake 5.Due to the special mechanical property of vertical member 3, in superstructure loading procedure, the force and deformation of this modulator can be divided into three phases:
First stage: elastic deformation stage.After now superstructure loading has just started or started, soon, after the telescopic element pressurized of modulator, Low Yield Point Steel is in the elastic deformation stage.Compare with foundation soil, because the elastic modulus E of Low Yield Point Steel is up to 210 GPa, therefore the compressional stiffness K=E*At/Ht of telescopic element is very large, modulator is out of shape hardly.At this moment, the stake top displacement of end bearing pile is almost nil; The stake top displacement of friction pile is equal to the compress variation (ignoring the compressive strain of pile concrete) of a subsoil.In this stage, foundation soil there is no compressive strain, also does not participate in bearing upper load.
Second stage: in succession surrender the stage.Increase gradually along with upper load, the vertical applied force of end bearing pile reaches its vertical bearing capacity characteristic value at first, according to the method in section design of modulator telescopic element, now Low Yield Point Steel starts surrender, stress do not increase or micro-increasing situation under, strain Free Development, impel modulator rigidity serious degradation, the newly-increased load of superstructure immediately under raft plate not yet the friction pile of surrender shift, thereby impel the vertical applied force of friction pile also to reach very soon its characteristic load bearing capacity, the telescopic element of modulator also starts surrender.In this stage, though the compress variation of foundation soil slightly increases, vertical applied force is still very little.
Phase III: plastic period.Under raft plate, the telescopic element of all piles top modulator is all surrendered, enters yield point elongation or weak strain hardening stage.Now, the rigidity of all modulators is by just becoming soft, distortion Free Development, and produce appropriate stake top displacement, thus drive raft plate to move down, impel foundation soil pressurized and participate in bearing upper load gradually.In this stage, because the synthetic rigidity of end bearing pile is larger, the newly increased load of being shared is more, and the compress variation of its modulator is just larger; The synthetic rigidity of friction pile is less, and just less, the compress variation of its modulator is also just less for the newly increased load of being shared.Therefore, the stake top modulator of all kinds of stakes, according to the soft or hard situation of place stake subsoil, automatically regulate the compress variation of telescopic element, impel the stake top displacement of all kinds of stakes to be consistent, friction pile, end bearing pile and foundation soil tripartite coordinate mutually, shared superstructure load, and thoroughly eliminate the differential settlement of raft plate.When superstructure has loaded, the vertical applied force of all kinds of stakes and foundation soil reaches the predetermined value of design separately.
When the utility model stake top intelligent control device is applied to composite pile foundation, concrete implementation step is as follows:
The first, calculate superstructure total load design load Q and bearing capacity of foundation slab Qs(=bearing eigenvalue of foundation soil * raft plate net area), calculate total load Qp=Q-Qs that foundation pile be should bear;
The second, according to the principle laying out pile under wall, post, lay out pile, and definite total amount of pile N, the total load of should bear according to foundation pile and total amount of pile, calculate the load P=Qp/N that single pile should be shared;
Three, according to engineering survey data, choose reasonable stake type (containing a stake footpath, stake long etc.), calculates vertical bearing capacity of single pile characteristic value Ra, guarantees Ra >=P;
Four, design vertical member 3-supporting side walls 31 and the built-in telescopic element 32 of modulator, make the yield strength of its total cross-sectional area=bearing capacity of single pile/Low Yield Point Steel; It highly gets 300-500 mm, concrete size, and the raft plate settling amount S0 in the time of can reaching characteristic load bearing capacity according to foundation soil determines, capping when S0 is larger, on the contrary remove the limit, make the maximum compression deflection of vertical member be approximately the twice of S0;
Five, according to the measuring body requirement in part, design upper and lower backing plate 2,4, processing and fabricating stake top intelligent control device;
Six, etc., when foundation pile 5 constructions are to predetermined absolute altitude, place a stake top intelligent control device, the construction that then enters raft plate 1.
The utility model stake top intelligent control device is characterised in that:
1, can automatically control the stressed of foundation pile according to the intention of design, make it to reach the predetermined value of design, and maintain all the time near this value;
2, can, at the desired time point of design, automatically change self rigidity, by just becoming soft, even approach zero stiffness, and produce larger compress variation, impel stake top to produce appropriate displacement, and drive raft plate to move down, and force foundation soil pressurized and bring into play carrying effect, realize pile soil common action;
3, can automatically regulate the compress variation of telescopic element according to the soft or hard at the bottom of stake and practical distortion situation, harmonious to guarantee the tip displacement between dissimilar stake, realize the acting in conjunction of end bearing pile and friction pile.
Compared with prior art, the utility model stake top intelligent control utensil has the following advantages:
1, both solve the problem high-rise under special complex geological condition, how super highrise building implements composite pile foundation, made again the enforcement of composite pile foundation become more simple, safety, economy, rationally, and thoroughly eliminated the differential settlement of raft plate.
2, not high enough for the vertical bearing capacity because of foundation soil, cannot adopt traditional pile foundation engineering of composite pile foundation, can effectively solve the series of complex problem that differs greatly and produce due to support stiffness between foreign peoples's stake, make under same cushion cap, end bearing pile and friction pile are also with becoming possibility.
3, after hope utilizes demolishing buildings, be retained in old when stake in ground, can effectively solve between new and old stake because support stiffness differs the trouble of bringing compared with greatly, realize the acting in conjunction of new, old stake.
Above-mentioned explanation illustrates and has described preferred embodiment of the present utility model, as previously mentioned, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can, in utility model contemplated scope described herein, by technology or the knowledge of above-mentioned instruction or association area, change.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection domain of the utility model claims.
Claims (9)
1. elder generation's soft stake top intelligent control device from becoming rigidity just, this modulator is arranged between raft plate and stake, it is characterized in that: this modulator forms a tubular by upper and lower backing plate and the vertical member that is arranged between upper and lower backing plate; Described vertical member has that telescopic element that the metal material of desirable or accurate ideal elastic-plastic stress-strain relation makes forms during at least by a uniaxial compression, or described vertical member has that telescopic element that the metal material of desirable or accurate ideal rigid plastic stress strain stress relation makes forms during at least by a uniaxial compression.
2. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as claimed in claim 1, is characterized in that: described telescopic element surrounds barrel.
3. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as claimed in claim 1, is characterized in that: described vertical member also comprises that one surrounds the supporting side walls of barrel, and described telescopic element is placed in cylinder.
4. a kind of elder generation as claimed in claim 3 soft stake top intelligent control device from becoming rigidity just, it is characterized in that: described supporting side walls is to have the supporting side walls that the metal material of desirable or accurate ideal elastic-plastic stress-strain relation is made during by a uniaxial compression, or described supporting side walls is to have the supporting side walls that the metal material of desirable or accurate ideal rigid plastic stress strain stress relation is made during by a uniaxial compression.
5. a kind of elder generation as claimed in claim 3 soft stake top intelligent control device from becoming rigidity just, is characterized in that: described supporting side walls is to be better than by deformability the supporting side walls that the material of telescopic element deformability is made.
6. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as claimed in claim 5, is characterized in that: described supporting side walls is the supporting side walls of being made by mild steel or flexible metal.
7. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as described in claim 1 to 6 any one, is characterized in that: described telescopic element is one or more.
8. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as described in claim 1 to 6 any one, is characterized in that: described telescopic element is Low Yield Point Steel.
9. the firm rear soft stake top intelligent control device from becoming rigidity of a kind of elder generation as claimed in claim 7, is characterized in that: described telescopic element is Low Yield Point Steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320335272.8U CN203498875U (en) | 2013-06-09 | 2013-06-09 | Pile top intelligent regulator capable of changing rigidity into flexibility automatically |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320335272.8U CN203498875U (en) | 2013-06-09 | 2013-06-09 | Pile top intelligent regulator capable of changing rigidity into flexibility automatically |
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| CN203498875U true CN203498875U (en) | 2014-03-26 |
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| CN201320335272.8U Expired - Fee Related CN203498875U (en) | 2013-06-09 | 2013-06-09 | Pile top intelligent regulator capable of changing rigidity into flexibility automatically |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555145A (en) * | 2018-12-04 | 2019-04-02 | 南京工业大学 | A kind of hot melt effect pile-end stiffness regulating device |
| CN110485454A (en) * | 2019-08-27 | 2019-11-22 | 南京工业大学 | A kind of semi-active type displacement governor |
| CN113914390A (en) * | 2021-10-29 | 2022-01-11 | 南京工业大学 | Pile top rigidity adjusting device based on variable-strength supporting material |
-
2013
- 2013-06-09 CN CN201320335272.8U patent/CN203498875U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555145A (en) * | 2018-12-04 | 2019-04-02 | 南京工业大学 | A kind of hot melt effect pile-end stiffness regulating device |
| CN109555145B (en) * | 2018-12-04 | 2019-10-08 | 南京工业大学 | A kind of hot melt effect pile-end stiffness regulating device |
| CN110485454A (en) * | 2019-08-27 | 2019-11-22 | 南京工业大学 | A kind of semi-active type displacement governor |
| CN110485454B (en) * | 2019-08-27 | 2023-10-24 | 南京工业大学 | Semi-active displacement regulator |
| CN113914390A (en) * | 2021-10-29 | 2022-01-11 | 南京工业大学 | Pile top rigidity adjusting device based on variable-strength supporting material |
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Granted publication date: 20140326 Termination date: 20190609 |