CN101487267A - Support stiffness-adjustable pile-raft foundation and construction process - Google Patents
Support stiffness-adjustable pile-raft foundation and construction process Download PDFInfo
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- CN101487267A CN101487267A CNA2009100283584A CN200910028358A CN101487267A CN 101487267 A CN101487267 A CN 101487267A CN A2009100283584 A CNA2009100283584 A CN A2009100283584A CN 200910028358 A CN200910028358 A CN 200910028358A CN 101487267 A CN101487267 A CN 101487267A
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Abstract
The invention discloses a piled raft foundation provided with the adjustable support rigidity. The piled raft foundation comprises a pile foundation, a raft plate, a placement adjuster and a deformation marking rod. The displacement adjuster is arranged between the pile foundation and the raft plate to adjust the comparative deformation of the pile foundation and the raft plate; the deformation marking rod is used for measuring the comparative deformation amount between the pile foundation and the raft plate; the lower part of the deformation marking rod is connected with the pile top and the upper part thereof is threaded through a steel pipe to be extended out of the raft plate; and the steel pipe is pre-embedded inside the raft plate. Compared with the prior art, the piled raft foundation with the adjustable support rigidity is characterized in that the support rigidity can be adjusted freely under the condition that the anti-bending, anti-cutting and anti-pulling capability of the connecting part of the piled raft is not less than that of the conventional pile foundation and the characteristic of the piled raft foundation can be used for te fields of the pile-soil combination, the adjustable rigidity design of the building raft plate and the reuse of the worn pile of buildings, and the like. With the manual adjustable support rigidity, the application range of the piled raft foundation is not restricted by the geological condition and has wide adaptability.
Description
Technical field
The present invention relates to the pile-raft foundation and the construction technology of the optimal design of pile-raft foundation, particularly support stiffness-adjustable.
Background technology
Along with expanding economy, the highrise building emerge in multitude, for obtaining the sedimentation of enough bearing capacities, minimizing building, the application of pile-raft foundation is more and more general.The particularly conventional pile foundation of building pile foundation is though provide enough bearing capacity, reduced the total settlement of building for building structure.But relative settlement but loses improvement.A large amount of engineering measurement data show, although the stake number is many, dish-shaped sedimentation is still inevitable, and particularly frame is cut, frame tube, tube in tube structure be more obvious.Research confirms that relative settlement is the root that causes basic internal force and the increase of superstructure secondary stress, thickness of slab and arrangement of reinforcement to increase.
By for many years acting in conjunction theoretical research as can be known, different superstructures, basis (stake raft) all can exert an influence to the internal force and the distortion of building with the Stiffness Distribution of ground.Superstructure is owing to be subjected to the restriction of function of use, and general being difficult to adjusted it.Raft plate and other form basis, though can be by changing thickness of slab, girt strip is set, dwindle wall and wait apart from (case base) and adjust soil rigidity and distribute, effect and not obvious, and the cost of paying is very big.Therefore the support stiffness of the supporting mass that ground and pile foundation are constituted carries out controlled, rational adjustment and is only relative settlement and controls and design effective method.There is at present the part scholar that some researchs are carried out in the relative settlement of control building and the problems such as design optimization of foundation both at home and abroad.Killing golden jade-like stone proposes to improve basic work proterties with the bed course of different-stiffness and piles with different footpath, the mode of laying out pile that piles with different is long, reduce the sedimentation and the differential settlement of building, particularly attempted the practical engineering application of the different settlement Control of homodyne by the plastic support stake, effect is remarkable.Liu Jinli proposes acting in conjunction variable-stiffness leveling optimal design notion and method, adds stake, subtracts stake and adjusts the rigidity that methods such as stake is long change foundation by substrate some areas, reduces the relative settlement of building; Randolph also inquires into the different influences of mode to raft plate internal force and distortion that lay out pile by model testing.Above-mentioned research has obtained some achievements in research, and certain application value is arranged, but also has a lot of defectives.The mode of laying out pile as piles with different footpath, piles with different length is subjected to the influence of superstructure form and geological conditions, and particularly end holds in the highest flight friction end bearing pile or end bearing pile, and the raft plate pushes up distortion with the stake end just to be difficult to coordinate, thereby range of application is severely limited; The method that the different-stiffness bed course is set at highrise building master annex respectively also has that bearing capacity is determined, quantitative design calculation theory imperfection, immature, the unmanageable drawback of constructing of method such as control of settlement calculation, rigidity, and also can only to be applied to adopt natural ground be the highrise building of bearing stratum.
What extensively noted at present is, can be in the relatively poor area of soil property by pile foundation thrust the bearing capacity of considering foundation soil downwards, but build highrise building in the area preferably in some soil property, when natural bearing capacity of foundation soil can not satisfy the needs of superstructure load, but be more or less the same, use pile foundation instead this moment after, because the stake end has bearing stratum preferably, pile foundation can't be thrust downwards, and good bearing stratum can't obtain utilizing under the substrate, wastes huge.Therefore how the end bearing pile basis makes full use of good bearing capacity of foundation slab becomes the theoretical a great problem of using of pile soil common action.To this, kill golden jade-like stone, Zhou Feng by independent development, (patent No.: ZL200520071955), it can regulate self-deformation (deformation adjustment scope about 3～10cm) automatically according to load to have developed self adaptation deformation adjustment device first.It is installed on back, stake top (in parallel or series connection), can distributes to the support stiffness on whole basis and carry out more accurate artificial adjustment on demand, giving full play to the target that reaches the different sedimentation of building homodyne on the basis of bearing capacity of foundation slab.And its range of application will no longer be fettered by geological condition, have compliance widely.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned the deficiencies in the prior art, and a kind of pile-raft foundation and construction technology of support stiffness-adjustable are provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of stiffness-adjustable pile-raft foundation, comprise pile foundation, the raft plate, distortion sign bar, steel pipe and displacement adjustment device, described displacement adjustment device is arranged on the relative deformation that is used for regulating pile foundation and raft plate between pile foundation and the raft plate, it is characterized in that: described displacement adjustment device comprises adjustable reinforcing bar connector and displacement governor, in the deformation space between described pile foundation and raft plate, adjustable reinforcing bar connector is connected side by side with displacement governor, and this reinforcing bar connector is with the displacement governor adjusted in concert; Described reinforcing bar connector comprises a base plate, a top board, described base plate is provided with lacing wire and is connected with raft slab muscle, described top board is provided with down lacing wire and is connected with the stake reinforcing bar, and corresponding top board is passed in described upward lacing wire, and respective base is passed in described lacing wire down; The bottom of described distortion sign bar links to each other with the stake top, and top is passed steel pipe and exposed outside the raft plate, and distortion identifies the relative deformation that bar is used to measure pile foundation and raft plate, and described steel pipe is embedded in the raft plate in advance.
A kind of construction technology of pile-raft foundation may further comprise the steps:
The first step, pile foundation construction, and stake top displacement governor is installed on the stake top;
Second step: the adjustable reinforcing bar connector with the displacement adjustment device adjusted in concert is set in the displacement deformation space of pile foundation and raft plate, the following lacing wire of adjustable reinforcing bar connector is fixedlyed connected with the pile foundation reinforcing bar, and the last lacing wire of adjustable reinforcing bar connector is fixedlyed connected with raft slab muscle;
The 3rd step connected distortion sign bar on the stake top, distortion sign bar passes the steel pipe that is embedded in the raft plate, and exposes outside the raft plate;
The 4th step, construction finishes and displacement regulate finish after, by Grouting Pipe concreting in the space of pile foundation and raft plate, be connected the reinforcing bar of pile foundation and the reinforcing bar of raft plate in aggregates by described adjustable reinforcing bar connector.
Pile-raft foundation disclosed by the invention is placed the displacement adjustment device that displacement governor, reinforcing bar connector and distortion sign bar are formed between pile foundation and raft plate.This separates pile foundation with the raft plate, be used for regulating support stiffness, reinforcing bar connector is used to connect the reinforcing bar of pile foundation reinforcing bar and raft plate, thereby after the support stiffness adjusting is finished, pile foundation is reconnected with integral body with the raft plate, guarantee that the resistance to plucking ability of rigidity adjusting back pile foundation is not less than conventional pile foundation.Compared with prior art, support stiffness-adjustable pile-raft foundation disclosed by the invention can guarantee that bending resistance, shearing resistance and the resistance to plucking ability of stake raft junction is not less than under the situation of conventional pile foundation, and possessing support stiffness can freely regulated characteristic.These characteristics can be used for the fields such as recycling that pile soil common action, raft plate of building become rigidity Design and the old stake of building, because the artificial free adjustment of support stiffness, its range of application is also no longer restricted by geological conditions, has compliance widely.
Description of drawings
Fig. 1 is the structural representation of pile-raft foundation of the present invention.
Fig. 2 is the structural representation of reinforcing bar connector of the present invention.
Fig. 3 is the vertical view of Fig. 2.
Among the figure: 1, displacement governor, 2, adjustable reinforcing bar connector, 3, distortion sign bar, 4, side guard board, 5, injected hole, 6, pile foundation, 7, the raft plate, 8, top board, 9, lacing wire down, 10, go up lacing wire, 11, base plate.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated:
As shown in Figure 1, the pile-raft foundation that a kind of support stiffness is adjustable, relative settlement is very little, bearing capacity of foundation slab is given full play to.Specifically can resolve into as the lower part:
Device
Displacement governor is the key component of whole design, and the adjusting of the support stiffness work by displacement governor is realized.Present existing displacement governor is a self adaptation deformation adjustment device.It is mainly made by steel, rubber and some other engineering material, has the advantages that to regulate self-deformation according to load automatically.After setting is installed on it on the stake top when the support stiffness of suitable deformation adjustment device can produced as required, can distributes to the support stiffness on whole basis and carry out artificial adjustment on demand.
Adjustable reinforcing bar connector 2
Reinforcing bar connector 2 comprises a base plate 11, a top board 8, and base plate 11 is provided with lacing wire 10, and top board 8 is provided with down lacing wire 9, and base plate 11 is passed in following lacing wire 9, and top board 8 is passed in last lacing wire 10.When top board 8 was subjected to downward active force, the following lacing wire 9 that is connected with top board 8 moved down along the hole of base plate 11, thereby made top board 8 move down.
Because between stake end and the raft plate displacement adjustment device has been installed, the resistance to plucking ability of pile foundation is weakened, for remedying this deficiency, adjustable reinforcing bar connector must be installed between stake end and raft plate.Adjustable reinforcing bar connector not only can not influence the work effect of displacement governor, and transposition on the throne joint can realize effective connection of raft plate and stake after finishing by the mode of grouting, thereby a resistance to plucking ability that makes is brought into play.
Be used for measuring the displacement regulated quantity of displacement governor, it has characteristics such as simple in structure, that installation and processing convenient, cost is low.
Designing requirement
Stiffness-adjustable pile-raft foundation generally is suitable for better area of soil property.When foundation soil is born most of superstructure load, use a spot of stake to bear the total settlement and the relative settlement of residue load and control building.In the specific design process of pile-raft foundation disclosed by the invention, should note following basic demand.
The value of bearing capacity of foundation slab
But the reasonable value of bearing capacity of foundation slab is the importance that rigidity mode pile-raft foundation successfully designs, and has also determined the cost on whole basis to a great extent.When the foundation soil destruction of loses stability not, and distortion s is also just within permissible range [S] time, and the design of ground is most economical.In order to make full use of the bearing capacity of foundation soil, when carrying out the calculating of bearing capacity of foundation slab, just can not be confined to elastic stage all the time.Concrete bearing capacity of foundation slab f
aGet surely should according to test in situ and with due regard to the dimensional effect of raft plate determine, that is also should control to determine the bearing capacity of foundation soil by allowable strain.
Determining of stake number
Stake should be arranged in wall under and under the post as far as possible, and clump of piles center of gravity aims at loaded center of gravity as far as possible, and a number is on this basis
In the formula, Q is that the heavy standard value of soil is gone up on superstructure vertical force design load, basis deadweight design load and basis, and A is the basis end gross area, f
aFor through revising groundwork soil bearing capacity characteristic value, P
aBe the vertical bearing capacity of single pile characteristic value.
Because the compatible deformation by stake soil is guaranteed by stake top deformation adjustment device, use to limiting value so bearing capacity of single pile is also unnecessary in the following formula, be taken as characteristic value by " technical code for building pile foundation " suggestion and get final product.So, can be by difference construction and operational phase, by Combined Action Analysis with control sedimentation and relative settlement.
Stake end deformation adjustment Design of device
Stiffness-adjustable pile-raft foundation is holding the stressed terminal stage of lotus, and the distortion of stake soil is still coordination, therefore the displacement s of the required adjusting of stake end anamorphic attachment for cinemascope
0In fact be exactly the decrement (should deduct the decrement of pile body on the stricti jurise again) that foundation soil is born inter-pile soil behind the load, this deflection also is the settling amount on whole basis when stake is end bearing pile.A load that the end anamorphic attachment for cinemascope is finally born is the bearing capacity of single pile characteristic value in addition, and therefore the rigidity of stake end anamorphic attachment for cinemascope is
In the formula, s
0Deflection for self adaptation deformation adjustment device.Should also be noted that stake is to bring into play to P when Degree of Safety is analyzed
u, therefore with 2s
0Limit regulated quantity during for actual fabrication.
The analysis of total bearing capacity degree of safety and calculating
The natural ground ultimate bearing capacity is about 2.5f
a, when imaginary Q to Q
uDuring development, P
aTo P
uDevelopment reaches P
uThe time, deformation allowance 2s
0Use up, stake end further distortion is very limited, can not guarantee that the soil body performs to 2.5f
aFor safety can be estimated as 2.0f
aSo the ultimate bearing capacity of stiffness-adjustable pile-raft foundation integral body is:
Q
u＝2.0f
aA+nP
u
And Q
u=f
aA+nP, so the total bearing capacity degree of safety of end bearing pile composite pile foundation is:
So far, press end bearing pile composite pile foundation design basis, its total bearing capacity degree of safety K satisfies standard [10] requirement.
Construction technology
Just begin the installation of self adaptation deformation adjustment device after pile foundation construction is finished, the installation of self adaptation deformation adjustment device can be divided into following process: the pile crown cleaning; The installation of adjuster undersetting; Prop up template, stake top concreting; The adjuster location and installation; The installation of distortion sign bar and injected hole; Adjuster side guard board and upper cover plate are installed.The installation of adjustable reinforcing bar connector is to carry out synchronously with the installation of self adaptation deformation adjustment device, and concrete steps are: bearing is installed, and base plate and the pre-buried muscle of raft plate (lacing wire) are installed; Top board is installed.After displacement is regulated and finally finished,, realize that stake is connected with the effective of raft plate by the grouting port concrete perfusion.
Claims (4)
1, a kind of stiffness-adjustable pile-raft foundation, comprise pile foundation, raft plate, distortion sign bar, steel pipe and displacement adjustment device, described displacement adjustment device is arranged on the relative deformation that is used for regulating pile foundation and raft plate between pile foundation and the raft plate, it is characterized in that: described displacement adjustment device comprises adjustable reinforcing bar connector and displacement governor, in the deformation space between described pile foundation and raft plate, adjustable reinforcing bar connector is connected side by side with displacement governor, and this reinforcing bar connector is with the displacement governor adjusted in concert.
2, stiffness-adjustable pile-raft foundation according to claim 1, it is characterized in that: described reinforcing bar connector comprises a base plate, a top board, described base plate is provided with lacing wire and is connected with raft slab muscle, described top board is provided with down lacing wire and is connected with the stake reinforcing bar, corresponding top board is passed in described upward lacing wire, and respective base is passed in described lacing wire down.
3, stiffness-adjustable pile-raft foundation according to claim 1, it is characterized in that: the distortion sign bar that is used to measure pile foundation and raft plate relative deformation, its underpart links to each other with the stake top, and top is passed steel pipe and exposed outside the raft plate, and described steel pipe is embedded in the raft plate in advance.
4, a kind of construction technology that is used for the described pile-raft foundation of claim 1 is characterized in that: may further comprise the steps:
The first step, pile foundation construction, and stake top displacement governor is installed on the stake top;
Second step: the adjustable reinforcing bar connector with the displacement adjustment device adjusted in concert is set in the displacement deformation space of pile foundation and raft plate, the following lacing wire of adjustable reinforcing bar connector is fixedlyed connected with the pile foundation reinforcing bar, and the last lacing wire of adjustable reinforcing bar connector is fixedlyed connected with raft slab muscle;
The 3rd step connected distortion sign bar on the stake top, distortion sign bar passes the steel pipe that is embedded in the raft plate, and exposes outside the raft plate;
The 4th step, construction finishes and displacement regulate finish after, by Grouting Pipe concreting in the space of pile foundation and raft plate, be connected the reinforcing bar of pile foundation and the reinforcing bar of raft plate in aggregates by described adjustable reinforcing bar connector.
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| CN2009100283584A CN101487267B (en) | 2009-01-14 | 2009-01-14 | Support stiffness-adjustable pile-raft foundation and construction process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541377B (en) * | 2013-10-30 | 2015-10-28 | 南京工业大学 | Overall process controllable type displacement adjustment device |
| CN106592620A (en) * | 2016-12-16 | 2017-04-26 | 上海岩土工程勘察设计研究院有限公司 | Construction method of coordination device for guaranteeing pile-soil co-action |
| CN109214070A (en) * | 2018-08-23 | 2019-01-15 | 建研地基基础工程有限责任公司 | Method for leveling pile foundation of main skirt connected high-rise building |
| CN109440797A (en) * | 2018-12-04 | 2019-03-08 | 南京工业大学 | A kind of galvanomagnetic-effect pile-end stiffness regulating device |
| CN109537618A (en) * | 2018-12-04 | 2019-03-29 | 南京工业大学 | A kind of segmentation hot melt stake end support stiffness regulating device |
| CN109629591A (en) * | 2018-12-05 | 2019-04-16 | 南京工业大学 | It is a kind of to exempt from the secondary rigidity controllable type stake top structural texture and its construction method poured |
| CN111767598A (en) * | 2020-06-19 | 2020-10-13 | 中国十七冶集团有限公司 | Refined old pile recycling method |
| CN113863349A (en) * | 2021-10-28 | 2021-12-31 | 南京工业大学 | Uplift-resistant rigidity-controllable piled raft foundation structure and construction method |
| CN114398733A (en) * | 2022-01-16 | 2022-04-26 | 中国有色金属工业昆明勘察设计研究院有限公司 | Method and device for obtaining optimal leveling rigidity of pile top displacement regulator of composite foundation |
| CN115305939A (en) * | 2022-08-24 | 2022-11-08 | 中冶集团武汉勘察研究院有限公司 | Active pile-raft foundation settlement coordination structure and construction method |
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2009
- 2009-01-14 CN CN2009100283584A patent/CN101487267B/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541377B (en) * | 2013-10-30 | 2015-10-28 | 南京工业大学 | Overall process controllable type displacement adjustment device |
| CN106592620A (en) * | 2016-12-16 | 2017-04-26 | 上海岩土工程勘察设计研究院有限公司 | Construction method of coordination device for guaranteeing pile-soil co-action |
| CN109214070A (en) * | 2018-08-23 | 2019-01-15 | 建研地基基础工程有限责任公司 | Method for leveling pile foundation of main skirt connected high-rise building |
| CN109214070B (en) * | 2018-08-23 | 2023-01-13 | 建研地基基础工程有限责任公司 | Method for leveling pile foundation of main skirt connected high-rise building |
| CN109537618B (en) * | 2018-12-04 | 2019-09-24 | 南京工业大学 | A kind of segmentation hot melt stake end support stiffness regulating device |
| CN109537618A (en) * | 2018-12-04 | 2019-03-29 | 南京工业大学 | A kind of segmentation hot melt stake end support stiffness regulating device |
| CN109440797A (en) * | 2018-12-04 | 2019-03-08 | 南京工业大学 | A kind of galvanomagnetic-effect pile-end stiffness regulating device |
| CN109629591A (en) * | 2018-12-05 | 2019-04-16 | 南京工业大学 | It is a kind of to exempt from the secondary rigidity controllable type stake top structural texture and its construction method poured |
| CN111767598A (en) * | 2020-06-19 | 2020-10-13 | 中国十七冶集团有限公司 | Refined old pile recycling method |
| CN111767598B (en) * | 2020-06-19 | 2024-02-02 | 中国十七冶集团有限公司 | Method for recycling refined old piles |
| CN113863349A (en) * | 2021-10-28 | 2021-12-31 | 南京工业大学 | Uplift-resistant rigidity-controllable piled raft foundation structure and construction method |
| CN113863349B (en) * | 2021-10-28 | 2022-04-12 | 南京工业大学 | Uplift-resistant rigidity-controllable piled raft foundation structure and construction method |
| CN114398733A (en) * | 2022-01-16 | 2022-04-26 | 中国有色金属工业昆明勘察设计研究院有限公司 | Method and device for obtaining optimal leveling rigidity of pile top displacement regulator of composite foundation |
| CN114398733B (en) * | 2022-01-16 | 2022-07-12 | 中国有色金属工业昆明勘察设计研究院有限公司 | Method and device for obtaining optimal leveling rigidity of pile top displacement regulator of composite foundation |
| CN115305939A (en) * | 2022-08-24 | 2022-11-08 | 中冶集团武汉勘察研究院有限公司 | Active pile-raft foundation settlement coordination structure and construction method |
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| Publication number | Publication date |
|---|---|
| CN101487267B (en) | 2010-06-23 |
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Application publication date: 20090722 Assignee: Nangong Tonge (Xiamen) Engineering Technology Co.,Ltd. Assignor: NANJING University OF TECHNOLOGY Contract record no.: X2022320000284 Denomination of invention: A pile raft foundation with adjustable bearing stiffness and its construction technology Granted publication date: 20100623 License type: Common License Record date: 20221118 |
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