CN106436694A - Precast pile cap applicable to jet grouting soil-cement-pile strengthened pile composite foundation - Google Patents
Precast pile cap applicable to jet grouting soil-cement-pile strengthened pile composite foundation Download PDFInfo
- Publication number
- CN106436694A CN106436694A CN201610952967.9A CN201610952967A CN106436694A CN 106436694 A CN106436694 A CN 106436694A CN 201610952967 A CN201610952967 A CN 201610952967A CN 106436694 A CN106436694 A CN 106436694A
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- Prior art keywords
- pile
- rubber pad
- steel plate
- cement
- surface layer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/60—Piles with protecting cases
Abstract
A precast pile cap applicable to a jet grouting soil-cement-pile strengthened pile composite foundation comprises a surface concrete layer which is poured into a barrel shape at a time by means of concrete, the section of the surface concrete layer is in an 'n' shape, and a combined framework is built in the surface concrete layer. The precast pile cap applicable to the jet grouting soil-cement-pile strengthened pile composite foundation is characterized in that the combined framework comprises a steel plate and a steel rib mesh; the end face of the steel plate is round; the center of the steel rib mesh is welded to the steel plate; the bottom surface of the surface concrete layer is provided with a central rubber pad installing groove directly communicating with the bottom surface of the steel plate; the bottom surface of the steel plate is bonded to a central rubber pad; and an annular rubber pad is arranged on the bottom surface of the surface concrete layer and surrounds the periphery of the central rubber pad installing groove. The precast pile cap is prefabricated, and has the advantages of being high in strength, simple in structure, convenient to machine, manufacture and operate, low in construction cost and the like; and fast construction of the pile cap of the jet grouting soil-cement-pile strengthened pile composite foundation can be achieved, and sharing of stress of a cement soil pile and a core pile can be well adjusted.
Description
Technical field
This programme is related to the pile cover in foundation treatment engineering, and in particular to a kind of compound suitable for cement slotting built pile
The prefabricated pile cover of ground.
Background technology
Cement slotting built pile includes the composite pile of various lock pins in cement earth pile, such as cement earth pile composite core
Stake, stiffness stake.
Pile cover need to be made at core stake top end during the construction of cement slotting composite foundation of composite pile, at present in terms of pile cover
Present Research is as follows：
（1）200820230810.6 this utility model is related to a kind of upper load for using in highway engineering Soft foundation treatment
To the composite concrete pile cap of the problem of transmission of bottom pile foundation, including carrying steel plate, be provided with the middle part for carrying steel plate bottom surface plus
The strength collar, on steel plate bottom surface is carried, the outer radius of the collar of putting more energy into be provided with stiffened steel plates, connect with stake top face in the collar of putting more energy into
Rubber sheet gasket is pasted with tactile carrying steel plate bottom surface, the rubber sheet gasket of the patent mainly solves to carry steel plate bottom surface and stake top face
Due to the problem of stress concentration that processing or construction error are likely to result in.
（2）The Chinese patent of Application No. 200910135359.9 discloses a kind of precast pile cap structure and its connected structure
Joint method, comprising body, beam column combining unit, foundation pile combining unit.The pile cover structure of invention is provided with through hole, this
Through hole is also needed to carry out prefabricated pile process of binding after pile cover installation, and this mode causes the ultimate shear capacity of pile cover poor, easily makes
Coming off occurs in pile cover, and complex operation.
（3）Application No. 201310030674.1 discloses a kind of flexible pile cap for composite foundation, including being laid in reinforcing pile
Horizontal base in stake top, many oblique loading bars being along the circumferential direction laid in above horizontal base and be laid in many oblique
Circular cuff on force rod；The Chinese patent of Application No. 201420723764.9 discloses a kind of pile tube pile cover construction, bag
Pile cover and pile tube is included, pile cover is arranged on the periphery on pile tube top, in pile cover, be equipped with square steel reinforcement cage, the length of side of square steel reinforcement cage
Twice for pile tube diameter；This two patent pile covers are all that the construction period is compared with prefabricated pile cover by way of field fabrication
Longer.
（4）The Chinese patent of application number 201520481702.6 discloses a kind of precast concrete pile cover, including concrete
Cap body, card body and reinforcing bar support body, reinforcing bar support body includes steel bar stress mesh sheet and dowel.Acceptable in concrete cap body
At least one is provided with through whole card body and the location and installation hole of concrete cap body, location and installation hole is arranged on the axial model of card body
In enclosing.
（5）The Chinese patent of Application No. 201521116438.2 discloses a kind of prefabricated pile cover, and pile cover main body is reinforcing bar
The stake of concrete prefabricated circle, the pre- round stake arrangement of reinforcement of armored concrete is using circumferential reinforcement and radial direction reinforcing bar cloth muscle；Application No.
201510119140.5 Chinese patent discloses a kind of composite foundation Prefabricated hollow pile pile cover and its fixing meanss, including by
Reinforced mesh is placed in the pile cover body for pouring in concrete, and reinforced mesh is the formation of a plurality of reinforcing bar cross weld with mesh
Network structure；The shoulder hole of insertion pile cover body is offered on pile cover body；This two patents are required for stake inner chamber at the scene to pour
Concrete is simultaneously conserved, and does not play superiority of the prefabricated pile cover on the duration completely.
（6）201610420237.4 this programme are related to a kind of stake and pile cover flexible connecting structure, including top steel plate, elasticity
Sleeve pipe, embedded steel plate and some WELDING STUDSs, can rotate against between pile crown and pile cover, increased the horizontal of top structure
Displacement allowance, meanwhile, the moment of flexure of stake also can be substantially reduced because of lateral displacement.
（7）The Chinese patent of Application No. 201610104685.3 discloses a kind of composite foundation assembled pile cover, it
Including top board and the fixed sleeve part being connected on top board downside, the patent simply carries out reinforcement to contact site, its connection
, easily there is local failure in limited strength.
At present, pile cover construction is mostly by the way of field fabrication, causes inefficiency, difficult quality guarantee, and after
Continuous curing time is long.With regard to prefabricated pile cover, existing related be similar to research to yet suffer from the connection of pile cover structure insecure, still need to into
Row concrete curing, install inconvenience, do not account for core stake and stake week soil cement share stress the shortcomings of.
Content of the invention
The purpose of this programme is that providing a kind of share stress to cement earth pile and core stake plays good adjustment effect,
Have the advantages that intensity height, simple structure, processing and fabricating be easy to operate, low cost, it is possible to achieve the soil cement of rapid construction is inserted
The prefabricated pile cover of core composite foundation of composite pile.
In order to achieve the above object, this programme adopts following technical proposals：A kind of multiple suitable for cement slotting built pile
The prefabricated pile cover of ground is closed, including becoming barrel-shaped concrete surface layer by concrete one-time-concreting, section is in undercut shape, mixed
Built-in combined frame body in solidifying soil top layer, is characterized in that the combined frame body includes steel plate and reinforced mesh, the top surface of steel plate
It is circle with bottom surface, the central part of reinforced mesh is welded with steel plate, and the bottom surface of concrete surface layer is provided with straight-through steel plate bottom surface
Central rubber pad mounting groove, steel plate bottom surface is bonding with central rubber pad；In the bottom surface of concrete surface layer around central rubber pad
Mounting groove periphery is provided with ring-shaped rubber pad；Central rubber pad is contacted with cement earth pile with core stake top end in contact, ring-shaped rubber pad.
The concrete feature of this programme also has, and the concrete surface layer cavity heights are 50mm ~ 150mm；In concrete surface layer
The diameter in chamber is equal or slightly larger than cement earth pile stake footpath, and the internal diameter of concrete surface layer and the difference of external diameter are 100mm ~ 300mm.
The concrete surface layer also includes suspension ring, and the suspension ring are welded through concrete surface layer with steel plate.
The combined frame body is concentric with concrete surface layer, and the steel plate of the combined frame body is concentric with reinforced mesh, institute
Reinforced mesh external diameter is stated less than concrete surface layer external diameter 50mm ~ 150mm.
The central rubber pad is concentric with the steel plate of combined frame body, its generally circular in shape or annular, the ring-type rubber
Rubber cushion is concentric with concrete surface layer, and which is shaped as annular, and it is straight that annulus outside diameter is equal to or slightly less than concrete surface layer inner chamber
Footpath.
The central rubber pad meets below equation with the thickness of ring-shaped rubber pad：
（E 1 ：The elastic modelling quantity of central rubber pad；E 2 ：The elastic modelling quantity of ring-shaped rubber pad；σ：Stress suffered by cement earth pile stake top,
No more than soil cement intensity value；n：Stress suffered by core stake stake top and cement earth pile stake top institute ratio stressed；χ：Core stake and cement
The pile head settlement of native stake is poor, according to field data, typically takes 2cm ~ 5cm；H：Central rubber mat thickness；h：Ring-shaped rubber pad thickness
Degree）.
The beneficial effect of this programme is：The pile cover have intensity height, simple structure, processing and fabricating is easy to operate, construction is fast,
The advantages of low cost, the rapid construction of pile cover can be realized on the premise of construction quality is ensured, to cement earth pile and core stake
Share stress plays good adjustment effect.
Description of the drawings
Fig. 1 applies to the prefabricated pile cap schematic diagram of cement slotting composite foundation of composite pile；Fig. 2 is combined frame
The upward view of body；Fig. 3 is combined frame body A-A profile；Fig. 4 is pile cover construction and installation schematic diagram.
In figure：1- concrete surface layer；2- combined frame body；3- central rubber pad；4- suspension ring；5- ring-shaped rubber pad；6- steel
Plate；7- reinforced mesh；8- core stake；9- core stake top end；10- cement earth pile；11- bed course；12- undisturbed soil.
Specific embodiment
With reference to the accompanying drawings and examples this programme is described further：
As shown in Fig. 1 ~ 3, a kind of prefabricated pile cover suitable for cement slotting composite foundation of composite pile, including by concrete once
Pour and barrel-shaped concrete surface layer 1 is built up, section is in undercut shape, and built-in combined frame body 2, described in concrete surface layer 1
Combined frame body 2 include steel plate 6 and reinforced mesh 7, the top surface of steel plate 6 and bottom surface for circle, the central part of reinforced mesh 7 with
Steel plate 6 is welded, and the bottom surface of concrete surface layer 1 is provided with 3 mounting groove of central rubber pad of 6 bottom surface of straight-through steel plate, 6 bottom surface of steel plate with
3 bonding of central rubber pad；In the bottom surface of concrete surface layer 1,3 mounting groove periphery of central rubber pad is provided with ring-shaped rubber pad
5.
Central rubber pad 3 is contacted with core stake top end 9, and ring-shaped rubber pad 5 is contacted with cement earth pile 10.
1 cavity heights of concrete surface layer are 50mm ~ 150mm；The diameter of 1 inner chamber of concrete surface layer is equal or slightly larger than cement
10 footpaths of native stake, the internal diameter of concrete surface layer 1 and the difference of external diameter are 100mm ~ 300mm.
Concrete surface layer 1 also includes suspension ring 4, and the suspension ring 4 are welded through concrete surface layer 1 with steel plate 6.
Combined frame body 2 is concentric with concrete surface layer 1, and the steel plate 6 of the combined frame body 2 is concentric with reinforced mesh 7, institute
7 external diameter of reinforced mesh is stated less than 1 external diameter 50mm of concrete surface layer ~ 150mm.
Central rubber pad 3 is concentric with the steel plate 6 of combined frame body 2, its generally circular in shape or annular, the ring-shaped rubber
Pad 5 is concentric with concrete surface layer 1, and which is shaped as annular, and it is straight that annulus outside diameter is equal to or slightly less than 1 inner chamber of concrete surface layer
Footpath.
As shown in figure 4, pile cover level is to size mainly by size and the engineering warp of site operation cement earth pile 10
Test determination.By the not central rubber pad 3 of equal thickness and ring-shaped rubber pad 5 is arranged, cement earth pile 10 and core stake 8 can be adjusted
Share stress；The setting of rubber sheet gasket has taken into full account core stake 8, the compatibility of deformation of cement earth pile 10, stake week undisturbed soil 12, permissible
The bearing capacity of cement slotting composite foundation of composite pile is preferably played.Pile cover after installing will ensure around core stake 8
In 10 vertical direction of cement earth pile completely in concrete surface layer below 1, carry out bed course 11 after pile cover installation again and construct, finally
Complete the construction of cement slotting composite foundation of composite pile.
The thickness of central rubber pad 3 and ring-shaped rubber pad 5 and the loading sharing of cement earth pile 10 and core stake 8, area of section,
The correlations such as the elasticity modulus of materials of rubber blanket.Central rubber pad 3 meets below equation with the thickness of ring-shaped rubber pad 5：
Wherein：E 1 ：The elastic modelling quantity of central rubber pad 3；E 2 ：The elastic modelling quantity of ring-shaped rubber pad 5；σ：10 stake top institute of cement earth pile
By stress, no more than soil cement intensity value；n：Stress suffered by 8 stake top of core stake and 10 stake top of cement earth pile institute ratio stressed；χ：
Core stake 8 is poor with the pile head settlement of cement earth pile 10, takes 2cm ~ 5cm；H：3 thickness of central rubber pad；h：5 thickness of ring-shaped rubber pad.
So that core stake 8 is as pile tube as an example, the cement slotting composite foundation of composite pile of test parameterss such as following table one is chosen.Table one
Test pile parameter
1. for 1#Stake：
The pile head settlement difference for core stake 8 being estimated with cement earth pile 10 is 2cm, stress suffered by 8 stake top of core stake and 10 stake top of cement earth pile
Institute stressed than be 4, for reaching the ratio of above share stress, from elastic modelling quantity for 10MPa central rubber pad 3 and ring-type
Rubber blanket 5, from thickness for 1cm ring-shaped rubber pad 5 when, apply the formula：
H=3.58cm is calculated, the thickness from central rubber pad is 3.5cm.
2. for 2#Stake：
The pile head settlement difference for core stake 8 being estimated with cement earth pile 10 is 3cm, stress suffered by 8 stake top of core stake and 10 stake top of cement earth pile
Institute stressed than be 5, for reaching the ratio of above share stress, from elastic modelling quantity for 10MPa central rubber pad 3 and ring-type
Rubber blanket 5, from thickness for 1cm ring-shaped rubber pad 5 when, apply the formula：
H=4.2cm is calculated, the thickness from central rubber pad is 4cm.
3. for 3#Stake：
The pile head settlement difference for core stake 8 being estimated with cement earth pile 10 is 5cm, stress suffered by 8 stake top of core stake and 10 stake top of cement earth pile
Institute stressed than be 10, for reaching the ratio of above share stress, from elastic modelling quantity for 20MPa central rubber pad 3 and ring
Shape rubber blanket 5, from thickness for 1cm ring-shaped rubber pad 5 when, apply the formula：
H=6.7cm is calculated, the thickness from central rubber pad is 6.5cm.
According to the above thickness for data being calculated, choosing central rubber pad 3 and ring-shaped rubber pad 5, core stake 8 after the pile cover is applied
Measured stress ratio and differential settlement such as following table two with 10 stake top of cement earth pile.
Two measured stress ratio of table and differential settlement
Can be obtained by Monitoring Data such as the measured stress ratio of above cement slotting composite foundation of composite pile and differential settlements：Pass through
Rational choice central rubber pad 3 and the thickness of ring-shaped rubber pad 5, the prefabricated pile cover of this programme has reached expected loading sharing effect
Really, good adjustment effect can be played to the share stress of cement earth pile 10 and core stake 8.
Claims (6)
1. a kind of prefabricated pile cover suitable for cement slotting composite foundation of composite pile, including becoming drum by concrete one-time-concreting
The concrete surface layer of shape, section is in undercut shape, and built-in combined frame body in concrete surface layer is characterized in that the combination bone
Support body includes steel plate and reinforced mesh, the top surface of steel plate and bottom surface for circle, and the central part of reinforced mesh is welded with steel plate, is mixed
The bottom surface on solidifying soil top layer is provided with the central rubber pad mounting groove of straight-through steel plate bottom surface, and steel plate bottom surface is bonding with central rubber pad；
In the bottom surface of concrete surface layer, central rubber pad mounting groove periphery is provided with ring-shaped rubber pad；Central rubber pad and core stake top
End in contact, ring-shaped rubber pad is contacted with cement earth pile.
2. the prefabricated pile cover suitable for cement slotting composite foundation of composite pile according to claim 1, is characterized in that institute
Concrete surface layer cavity heights are stated for 50mm ~ 150mm；The diameter of concrete surface layer inner chamber is equal or slightly larger than cement earth pile stake
Footpath, the internal diameter of concrete surface layer and the difference of external diameter are 100mm ~ 300mm.
3. the prefabricated pile cover suitable for cement slotting composite foundation of composite pile according to claim 1, is characterized in that institute
Stating concrete surface layer also includes suspension ring, and the suspension ring are welded through concrete surface layer with steel plate.
4. the prefabricated pile cover suitable for cement slotting composite foundation of composite pile according to claim 1, is characterized in that institute
State that combined frame body is concentric with concrete surface layer, the steel plate of the combined frame body is concentric with reinforced mesh, the reinforced mesh
External diameter is less than concrete surface layer external diameter 50mm ~ 150mm.
5. the prefabricated pile cover suitable for cement slotting composite foundation of composite pile according to claim 1, is characterized in that institute
State central rubber pad concentric with the steel plate of combined frame body, its generally circular in shape or annular, the ring-shaped rubber pad and coagulation
Native top layer is concentric, and which is shaped as annular, and annulus outside diameter is equal to or slightly less than concrete surface layer intracavity diameter.
6. the prefabricated pile cover suitable for cement slotting composite foundation of composite pile according to claim 1, is characterized in that institute
The thickness for central rubber pad being stated with ring-shaped rubber pad meets below equation：.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610952967.9A CN106436694B (en) | 2016-11-03 | 2016-11-03 | Prefabricated pile cover suitable for cement slotting composite foundation of composite pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610952967.9A CN106436694B (en) | 2016-11-03 | 2016-11-03 | Prefabricated pile cover suitable for cement slotting composite foundation of composite pile |
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| CN106436694A true CN106436694A (en) | 2017-02-22 |
| CN106436694B CN106436694B (en) | 2019-01-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056711A (en) * | 2018-08-31 | 2018-12-21 | 河海大学 | A kind of nail shape strength core stake and its construction method |
| CN110004918A (en) * | 2019-04-25 | 2019-07-12 | 南京林业大学 | A kind of rigid pile composite foundation assembled pile cover and its assemble method |
| CN112609704A (en) * | 2020-12-07 | 2021-04-06 | 浙江大东吴集团建设有限公司 | Construction pile based on SMW construction method and construction method thereof |
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| GB9715926D0 (en) * | 1997-07-29 | 1997-10-01 | Freeman John J | Integrated building structure |
| JP2007297791A (en) * | 2006-04-28 | 2007-11-15 | Japan Pile Corp | Rotary cap for embedding prefabricated pile |
| CN101476321A (en) * | 2009-01-21 | 2009-07-08 | 路桥集团国际建设股份有限公司 | Piston type pile cap |
| CN201339185Y (en) * | 2008-12-15 | 2009-11-04 | 李国胜 | Composite concrete pile cap |
| CN204780865U (en) * | 2015-07-06 | 2015-11-18 | 建华建材投资有限公司 | Precast concrete pile cap |
| CN206157718U (en) * | 2016-11-03 | 2017-05-10 | 山东省建筑科学研究院 | Prefabricated pile cover suitable for soil cement lock pin composite pile composite foundation |
-
2016
- 2016-11-03 CN CN201610952967.9A patent/CN106436694B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9715926D0 (en) * | 1997-07-29 | 1997-10-01 | Freeman John J | Integrated building structure |
| JP2007297791A (en) * | 2006-04-28 | 2007-11-15 | Japan Pile Corp | Rotary cap for embedding prefabricated pile |
| CN201339185Y (en) * | 2008-12-15 | 2009-11-04 | 李国胜 | Composite concrete pile cap |
| CN101476321A (en) * | 2009-01-21 | 2009-07-08 | 路桥集团国际建设股份有限公司 | Piston type pile cap |
| CN204780865U (en) * | 2015-07-06 | 2015-11-18 | 建华建材投资有限公司 | Precast concrete pile cap |
| CN206157718U (en) * | 2016-11-03 | 2017-05-10 | 山东省建筑科学研究院 | Prefabricated pile cover suitable for soil cement lock pin composite pile composite foundation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056711A (en) * | 2018-08-31 | 2018-12-21 | 河海大学 | A kind of nail shape strength core stake and its construction method |
| CN110004918A (en) * | 2019-04-25 | 2019-07-12 | 南京林业大学 | A kind of rigid pile composite foundation assembled pile cover and its assemble method |
| CN112609704A (en) * | 2020-12-07 | 2021-04-06 | 浙江大东吴集团建设有限公司 | Construction pile based on SMW construction method and construction method thereof |
| CN112609704B (en) * | 2020-12-07 | 2022-01-07 | 浙江大东吴集团建设有限公司 | Construction pile based on SMW construction method and construction method thereof |
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| Publication number | Publication date |
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| CN106436694B (en) | 2019-01-04 |
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Address after: 250031 Shandong Province Flyover District of Ji'nan City Road 29. Co-patentee after: The First Company of China Eighth Engineering Bureau Ltd. Patentee after: Shandong Academy of Building Science Co., Ltd Address before: 250031 Shandong Province Flyover District of Ji'nan City Road 29. Co-patentee before: The First Company of China Eighth Engineering Bureau Ltd. Patentee before: Building Science Inst., Shandong Prov. |
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