CN208486286U - A kind of well foundation - Google Patents
A kind of well foundation Download PDFInfo
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- CN208486286U CN208486286U CN201821135364.0U CN201821135364U CN208486286U CN 208486286 U CN208486286 U CN 208486286U CN 201821135364 U CN201821135364 U CN 201821135364U CN 208486286 U CN208486286 U CN 208486286U
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- concrete
- pipe base
- concrete pipe
- pit shaft
- cushion cap
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Abstract
The utility model relates to a kind of well foundation, which includes pit shaft and the concrete pipe base being vertically distributed, and the bottom of pit shaft is sealed by bottom concrete, and the top of the bottom concrete is equipped with the cushion cap being fixedly connected with shaft in wall；The concrete pipe base passes through after bottom concrete with cushion cap integrally connected, and the hole passed through for concrete pipe base, concrete pipe base and corresponding hole clearance fit are offered on the bottom concrete.The well foundation stress of the utility model is clear, the concrete pipe base of open caisson bottom is set to for solving the problems, such as that foundation bearing is hypodynamic, open caisson and concrete pipe base have the advantages of being complementary to one another, basic gravity load can be made all to be transferred to ground, the effect of open caisson bottom frictional resistance has been played to greatest extent, substantially reduces the structure level thrust born at the top of concrete pipe base.
Description
Technical field
The utility model relates to a kind of well foundation more particularly to a kind of combined type well foundations.
Background technique
Caisson structure is an empty or multicell well box structure, generally by blade foot, the borehole wall, partition wall, wellhole, groove, jetting
Pipe group and all part compositions of detection pipes, bottom concrete, top cover, using the self weight of open caisson, cutting the earth in open caisson makes its sinking, reaches
To after designed elevation, a kind of bridge foundation that bottom concrete, wadding weft variation, top cover are constructed is carried out.Caisson structure can will be upper
The advantages that portion's load reaches ground, has buried depth larger, good integrity, stability is good can not only bear biggish vertical and water
Flat load also can be used as earth-retaining and water-retaining cofferdam structure object when construction, but the construction of Open Caisson Foundation duration is longer, difficulty of construction compared with
Greatly, costly.
Pile foundation is the base form that one group of pile foundation is combined by cushion cap, and advantage is that construction technology is more mature,
Low cost, it is preferable to settlement Control, but since pile foundation stiffness by itself is smaller, there is required, profundal zone construction to construction site
Difficulty is larger.
, also there is the composite foundation of part open caisson and pile foundation composition in recent years in the advantages of comprehensive open caisson and pile foundation, with
For the bridge middle line bridge of Qiongzhou Strait, to solve the construction in deep water, the problems such as foundation's settlement is big and use compound open caisson base
Plinth solves the problems, such as this in the way of squeezing into tubular pole in open caisson wall, bears vertical force jointly by open caisson and pile foundation.
In soft soil foundation, because its foundation bottom rock stratum bearing capacity is lower, the composite base of driven pile in above-mentioned caisson wall
There is certain restriction in terms of improving substrate vertical applied force, for deep soft soil foundation characteristic, consider individual bridge structures in plinth
Mechanical characteristic, superstructure vertical load can either be undertaken by needing to design one kind, and enough resist bridge horizontal thrust, be effectively reduced
The foundation structure form of foundation settlement.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of well foundation, to improve the stress of well foundation
Energy.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is as follows:
The bottom of a kind of well foundation, the concrete pipe base including pit shaft, being vertically distributed, pit shaft is sealed by bottom concrete
Mouthful, the top of the bottom concrete is equipped with the cushion cap being fixedly connected with shaft in wall；The concrete pipe base is mixed across back cover
With cushion cap integrally connected after solidifying soil, the hole passed through for concrete pipe base, concrete pipe base are offered on the bottom concrete
With corresponding hole clearance fit.
In this way, be set to the cushion cap that shaft in wall is fixedly connected at the top of bottom concrete, and by concrete pipe base with hold
Platform integrally connected, the hole clearance fit on concrete pipe base and bottom concrete may make cushion cap and cushion cap superstructure
Vertical load can directly pass to the ground at the different depth of bottom concrete bottom by pile foundation concrete, in addition, basic
Part vertical load ground nearby is passed to by bottom concrete, load effectively dispersed, and basis ground nearby is avoided
Sedimentation.
In fact, also may make that back cover is mixed by the gap size between Reasonable Regulation And Control concrete pipe base and corresponding hole
Solidifying soil plays a protective role to concrete pipe base, for example, when well foundation is by horizontal force action, horizontal thrust that open caisson is born because
Being effectively spaced apart between bottom concrete and pile foundation prevents pile foundation from cutting so as to avoid the horizontal force of concrete pipe base
It cuts through bad.
Further, several mid-boards are equipped in the pit shaft, the bottom end of the mid-board is protruded into bottom concrete, institute
It states several mid-boards and pit shaft inner cavity is divided at least two sub-chamber.
Preferably, it is equipped with 2 orthogonal mid-boards in the pit shaft, pit shaft inner cavity is divided into 4 sub-chamber, often
A cushion cap is respectively equipped in a sub-chamber, the edge of cushion cap is embedded in corresponding sub-chamber's inner wall in the horizontal direction.
Further, the concrete pipe base passes through reinforcing bar and cushion cap anchor connection.
Further, wadding weft variation is filled in the wellbore space at the top of cushion cap, pit shaft top is equipped with top cover.
Further, the cross section of the pit shaft is one of round, rectangle or other polygons
The construction method of well foundation as described above, includes the following steps:
S1, open caisson foundation pit is dug, and constructs pit shaft in open caisson foundation pit, pit shaft pours section by section and sinks down into designed elevation；
S2, the design specification according to concrete pipe base, the wellbore bottom punched hole construction constructed in step sl, pour coagulation
Native pile foundation, so that concrete pipe base top extends on the design top surface of bottom concrete；
S3, bottom concrete is poured, before pouring, the waveform steel pile casting of every pre-buried dimension in pile position, sufficiently by coagulation
Native pile foundation is separated with bottom concrete；
S4, disposable continuous placing cushion cap, wadding weft variation, concrete pipe base is connected with cushion cap.
S5, top cover is poured.
The construction method of well foundation as described above, includes the following steps:
S1, the design specification according to concrete pipe base, in the building position punched hole construction of well foundation, casting concrete stake
Base, so that concrete pipe base top extends on the design top surface of bottom concrete；
S2, open caisson foundation pit is dug, pit shaft is constructed in open caisson foundation pit, pit shaft pours section by section and sinks down into designed elevation；
Concrete pipe base and cushion cap are linked to be one by S3, disposable continuous placing bottom concrete, cushion cap, wadding weft variation
Body；
S4, top cover is poured.
The well foundation of the utility model can overcome the respective disadvantage of existing open caisson and pile foundation and current combined type heavy
The limitation of well construction technique, basis can utilize caisson structure resistance to horizontal thrust, limit levels displacement, and open caisson bottom is mixed
Solidifying soil pile foundation gives full play to that open caisson thrust stiffness is big, concrete pipe base is vertically carried for solving the problems, such as foundation capability
The strong feature of ability, construction technology appropriate can also play the technical advantage of combined type well foundation to greatest extent.
Well foundation in the utility model can use in complicated construction environment, be particularly suitable for Deep Thick Soft Ground
In ground.
Compared with prior art, the beneficial effects of the utility model are as follows:
(1) concrete pipe base by with cushion cap anchor connection, realization effectively combined with caisson structure, stress is clear；
(2) concrete pipe base and open caisson construction process are more flexible, and concrete pipe base can be before well sinking or after in place
Construction, greatly improves construction efficiency；
(3) well foundation resists superstructure load using open caisson, while providing larger frictional resistance by itself self weight
Power largely limits bridge horizontal displacement, and being set to the pile foundation of open caisson bottom, then to solve foundation capability insufficient
Problem, stress is clear, has the advantages of being complementary to one another.
(4) the combined type well foundation can make basic gravity load all be transferred to ground, and it is heavy to have played to greatest extent
The effect of bottom frictional resistance, substantially reduces the structure level thrust born at the top of concrete pipe base.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of well foundation of the utility model.
Fig. 2 is a kind of vertical profile figure of well foundation of the utility model.
Fig. 3 is a kind of sectional view in the horizontal direction of well foundation of the utility model.
Fig. 4 is the building flow diagram of the well foundation of embodiment 1 in the utility model.
Fig. 5 is the building flow diagram of the well foundation of embodiment 2 in the utility model.
In figure: 1, top cover；2, pit shaft；3, mid-board；4, cushion cap；5, bottom concrete；6, concrete pipe base；7, it is mixed to fill out core
Solidifying soil；8, caisson structure.
Specific embodiment
The utility model is described in detail below with reference to embodiment.It should be noted that in the absence of conflict, this
The feature in embodiment and embodiment in utility model can be combined with each other.For sake of convenience, hereinafter such as occur "upper",
"lower", "left", "right" printed words only indicate consistent with the upper and lower, left and right direction of attached drawing itself, do not rise to limit to structure and make
With.
Embodiment 1
" the combined type well foundation and construction technology in a kind of deep soft soil foundation " of the utility model, for deep soft
In soil base.It is the well foundation schematic diagram of the utility model referring to Fig. 1 ~ 3, including pit shaft 2, the bottom of pit shaft 2 are mixed by back cover
Solidifying soil 5 seals, and the top of the bottom concrete 5 is equipped with the cushion cap 4 being fixedly connected with shaft in wall；It further include vertically being distributed
Concrete pipe base 6, the concrete pipe base 6 pass through after bottom concrete 5 with 4 integrally connected of cushion cap, on the bottom concrete 5
Offer the hole passed through for concrete pipe base 6, concrete pipe base 6 and corresponding hole clearance fit.Top cover pit shaft, mid-board,
Cushion cap, bottom concrete, wadding weft variation constitute caisson structure 8.
2 mid-boards 3 are equipped in the pit shaft 2, the bottom end of the mid-board 3 is protruded into bottom concrete 5, and described 2
2 inner cavity of pit shaft is divided into 4 sub-chamber by mid-board 3.A cushion cap 4, the edge Yan Shui of cushion cap 4 are respectively equipped in each sub-chamber
Square to being embedded in corresponding sub-chamber's inner wall.It is filled with wadding weft variation 7 in the wellbore space at 4 top of cushion cap, 2 top of pit shaft is equipped with
Top cover 1.
When well sinking is prior to pile foundation construction, wherein bottom concrete 5 is the bottom structure of caisson structure, is being sealed
Waveform steel pile casting is reserved on base concrete 5, bottom concrete 5 and concrete pipe base 6 is effectively isolated, punched hole construction concrete
Pile foundation 6, disposable continuous placing cushion cap 4, wadding weft variation 7, to realize the secured connection of caisson structure 8 Yu concrete pipe base 6.
As shown in figure 4, Specific construction process are as follows:
(a) vacuum deep well is laid outside open caisson and pump well-point pipe, carry out pre- precipitation work in advance, and add to open caisson bottom
Gu region carries out compaction grouting；
(b) open caisson excavation of foundation pit extremely plays heavy absolute altitude, caisson cutting edge bed course and a poppet；
(c) the reinforcing bar binding and concreting of first segment caisson wall (i.e. the pit shaft borehole wall) and mid-board are carried out；
(d) first segment open caisson gradually sinks, it is normal sink when, should be sunk down into from intermediate to soil is symmetrically removed at blade foot
When above 2m of designed elevation or so, it should suitably slow down subsidence velocity and control except soil amount and except native position in well, so that open caisson is flat
Steady sinking, it is correct in place.After the absolute altitude of first segment well sinking to design requirement, the construction joint between section open caisson up and down is completed
After handling work, start the production of the second section open caisson, and sink until designed elevation；
(e) after well sinking to the bottom absolute altitude of design, before pouring bottom concrete, every pre-buried dimension in pile position
Waveform steel pile casting, sufficiently concrete pipe base 6 and bottom concrete 5 are separated, 6 punched hole construction of concrete pipe base；
(f) bottom concrete 5 is poured；
(g) after bottom concrete 5 reaches requirement, disposable continuous placing cushion cap 4, wadding weft variation 7；
(h) open caisson top cover 1 is poured, the construction of combined type well foundation is completed.
Embodiment 2
The well foundation structure of the present embodiment is same as Example 1, construction method different from, specifically: concrete-pile
When the construction of base is prior to caisson sinking construction, after wherein open caisson is in place, disposable continuous placing bottom concrete 5, is filled out cushion cap 4
Core concrete 7, to realize the secured connection of caisson structure 8 Yu concrete pipe base 6.As shown in figure 5, Specific construction process
Are as follows:
(a) 6 punched hole construction of open caisson base concrete pile foundation, casting concrete pile foundation 6；
(b) vacuum deep well is laid outside open caisson and pump well-point pipe, carry out pre- precipitation work in advance, and add to open caisson bottom
Gu region carries out compaction grouting；
(c) open caisson excavation of foundation pit extremely plays heavy absolute altitude, caisson cutting edge bed course and a poppet；
(d) the reinforcing bar binding and concreting of first segment caisson wall and mid-board are carried out；
(e) first segment open caisson gradually sinks, it is normal sink when, should be sunk down into from intermediate to soil is symmetrically removed at blade foot
When above 2m of designed elevation or so, it should suitably slow down subsidence velocity and control except soil amount and except native position in well, so that open caisson is flat
Steady sinking, it is correct in place.After the absolute altitude of first segment well sinking to design requirement, the construction joint between section open caisson up and down is completed
After handling work, start the production of the second section open caisson, and sink until designed elevation；
(f) after well sinking to the bottom absolute altitude of design, disposable continuous placing bottom sealing concrete 5, fills out core at cushion cap 3
Concrete seven；
(g) open caisson top cover 1 is poured, the construction of combined type well foundation is completed.
The content that above-described embodiment illustrates should be understood as that these embodiments are only used for being illustrated more clearly that the utility model,
Rather than limitation the scope of the utility model, the utility model matching operation technique can flexible combination use, reading this
After utility model, those skilled in the art each fall within power appended by the application to the modification of the various equivalent forms of the utility model
Benefit requires limited range.
Claims (5)
1. a kind of well foundation, including pit shaft (2) and the concrete pipe base (6) being vertically distributed, wherein the bottom of pit shaft (2) is by sealing
Base concrete (5) sealing, which is characterized in that held equipped with what is be fixedly connected with shaft in wall at the top of the bottom concrete (5)
Platform (4)；The concrete pipe base (6) pass through bottom concrete (5) afterwards with cushion cap (4) integrally connected, the bottom concrete (5)
On offer the hole passed through for concrete pipe base (6), concrete pipe base (6) and corresponding hole clearance fit.
2. well foundation according to claim 1, which is characterized in that several mid-boards (3) are equipped in the pit shaft (2),
The bottom end of the mid-board (3) is protruded into bottom concrete (5), several mid-boards (3) by pit shaft (2) inner cavity be divided into
Few 2 sub-chamber.
3. well foundation according to claim 2, which is characterized in that be equipped in the pit shaft (2) 2 it is orthogonal in
Pit shaft (2) inner cavity is divided into 4 sub-chamber, is respectively equipped in each sub-chamber a cushion cap (4) by partition wall (3), cushion cap (4)
Edge is embedded in corresponding sub-chamber's inner wall in the horizontal direction.
4. well foundation according to claim 1, which is characterized in that the concrete pipe base (6) and cushion cap (4) anchoring connect
It connects.
5. well foundation according to claim 1-4, which is characterized in that in the wellbore space at the top of cushion cap (4)
Filled with wadding weft variation (7), pit shaft (2) top is equipped with top cover (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821135364.0U CN208486286U (en) | 2018-07-18 | 2018-07-18 | A kind of well foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821135364.0U CN208486286U (en) | 2018-07-18 | 2018-07-18 | A kind of well foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208486286U true CN208486286U (en) | 2019-02-12 |
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ID=65247482
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821135364.0U Active CN208486286U (en) | 2018-07-18 | 2018-07-18 | A kind of well foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108755731A (en) * | 2018-07-18 | 2018-11-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of well foundation and construction method |
-
2018
- 2018-07-18 CN CN201821135364.0U patent/CN208486286U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108755731A (en) * | 2018-07-18 | 2018-11-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of well foundation and construction method |
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