CN202187340U - Socketed pile with concrete-filled steel tube core column - Google Patents

Socketed pile with concrete-filled steel tube core column Download PDF

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Publication number
CN202187340U
CN202187340U CN2011202497383U CN201120249738U CN202187340U CN 202187340 U CN202187340 U CN 202187340U CN 2011202497383 U CN2011202497383 U CN 2011202497383U CN 201120249738 U CN201120249738 U CN 201120249738U CN 202187340 U CN202187340 U CN 202187340U
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CN
China
Prior art keywords
pile
concrete
socketed
steel tube
short
Prior art date
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.)
Expired - Lifetime
Application number
CN2011202497383U
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Chinese (zh)
Inventor
张志明
杨国平
李新国
任增金
周丰
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China Communication Planning and Design Institute for Waterway Transportation Co
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China Communication Planning and Design Institute for Waterway Transportation Co
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Priority to CN2011202497383U priority Critical patent/CN202187340U/en
Application granted granted Critical
Publication of CN202187340U publication Critical patent/CN202187340U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a socketed pile with a concrete-filled steel tube core column. The socketed pile includes a light-weight structure pier main tube, expansive concrete, a short steel tube and poured concrete which are sequentially arranged from outside to inside, wherein the diameter of the short steel tube is 2.60m, the wall thickness of the short steel tube is 32mm, the expansive concrete is poured outside the short tube, and concrete is poured in the short tube; and the socketed pile adopts a contiguous high pile beam and slab structure, the pile foundation is a large-diameter (2.80m) steel tube pile, a lower foundation covering layer formed by sludge, clay and completely-weathered and highly-weathered rocks is approximately as thick as 10m, and a socketed supporting layer is made of slightly-weathered granites. The concrete-filled steel tube core column is socketed through the short steel tube, so as to improve the horizontal bearing capacity of the socketed structure, and further reduce the number of pile foundations for lower engineering cost.

Description

The steel tube concrete core pillar socketed pile
Technical field
The utility model relates to steel tube concrete core pillar embedding technique for rock, steel tube concrete core pillar socketed pile specifically.
Background technology
Socketed pile is often referred to the pile body of stake end build-in above rock of weathering in hard in the engineering; Socketed pile can be classified by job practices and the structure etc. of pile shaft material, stake, and common sorting technique comprises according to pile shaft material and classifies or classify according to job practices:
1) presses the pile shaft material classification
Socketed pile can be divided into embedding rock prestressed concrete pile and embedding rock piling bar by pile shaft material.Prestressed concrete pile can be divided into prestressed concrete square pile and major diameter prestressed concrete pipe pile again.The stake of this type only is used for medium-sized with lower terminal owing to receive the restriction of intensity own usually.Steel pipe pile has advantages such as the current of receiving, wave force are little, so embedding rock piling bar all adopts steel pipe pile.The used material of piling bar is generally common straightcarbon steel, the brilliant weldable structure steel of ordinary low-alloy steel and high-intensity fine, and the harbour depth of water is big more, also just is necessary to adopt high strength material steel more.
2) by the job practices classification
Socketed pile can be divided into conventional driven pile, hole to plant into stake and brill knotting and close stake etc. by job practices.
So-called boring is planted into stake, promptly adopts suitable hole creating technology, big hole to prescribed depth of ratio stake size of subdrilling, and stake is transferred in the hole, again joints cement mortar in the annular space between stake and hole wall.
So-called bore knotting and close stake, promptly use conventional method pile sinking to certain depth (with pile penetration control) after, with suitable hole creating technology from the pile tube internal drilling to projected depth.Again with stake strike-on to design elevation (still with pile penetration control).The geological conditions that the socketed pile of this type is suitable for that certain covering layer is arranged on the batholith or meets big erratic boulder.
Existing technical scheme is generally irrigated socketed pile structure or steel pipe pile embedded type socketed pile structure:
Irrigated socketed pile structure adopts concrete perfusion to connect the embedding rock structural shape of pile foundation and rock texture.Accompanying drawing 1 is seen in its concrete design, and wherein 1 is the rock stratum face, and 2 is reinforcing cage, and 3 is steel pipe pile, and 4 is covering layer.
Although the irrigated socketed pile generally can satisfy the requirement of vertical bearing capacity; But for the steel pipe pile structure of bearing than levels power; Face position, rock stratum moment of flexure is bigger; But this position exactly steel pipe pile to the weak node of embedding rock pouring concrete pile structural transition, the concrete perfusion structure bear the horizontal loading ability a little less than.
Precasting is implanted socketed pile and is meant and on the stake position, bores the rock pore-forming at present, goes into preformed pile at inner hole deposition then, adopts concrete perfusion or the fixed pile body of mud jacking method and the stake that forms.In the preparation; Adopt pile driving equipment that prefabricated steel pipe pile is beaten to scar or part and squeeze into scar, adopt rig pore-forming in stake, and pierce the rock stratum certain depth; Adopt again pile driving equipment with the steel pipe pile strike-on to the stake end; Adopt slag absorbing device clear hole bed rock slag, build inner concrete at last, this method has been applicable to certain tectal soft rock.Concrete technological process is with reference to accompanying drawing 2, and wherein step is following: a) steady stake; B) boring; C) strike-on; D) clear hole, pouring underwater concrete anchoring; Reference numeral: 1-pre-manufactured steel pile tube; 2-covering layer end face; 3-scar layer; The 4-inner concrete.
Steel pipe pile embedded type socketed pile structure mainly contains two shortcomings:
1) needs piling repeatedly; Working procedure tissue difficulty, pile foundation construction progress are difficult to guarantee that can construct through flowing water for the bridge pier of pile foundation negligible amounts overcome the influence of driving piles repeatedly to the duration; But for the big and intensive dock structure of pile foundation quantity, this difficulty is difficult to overcome.
2) the brill ichor degree of construction period is had relatively high expectations, need confirm to bore the size of rock boring according to the hardness of rock, should satisfy construction period pile foundation stability requirement, convenient again follow-up pile foundation is squeezed into, and there have slightly to be improper, all can increase very big construction trouble.
The utility model content
The disclosed steel tube concrete core pillar socketed pile of the utility model, be intended to solve following technical problem:
1) the horizontal bearing capacity problem of solution irrigated socketed pile;
2) the constructional difficulties problem of solution embedded type socketed pile;
3) economy problems of solution socketed pile.
The steel tube concrete core pillar socketed pile of the utility model, it is characterized in that it is from inwardly being made up of following assembly successively outward: the lightweight structures harbour is responsible for, expansive concrete, short steel pipes and concrete perfusion.
Further, said short steel pipes diameter is 2.60m, and wall thickness is 32mm, concrete perfusion in the short tube outer filling expansive concrete, short tube.
Further, this socketed pile adopts formula high-pile beam structure in flakes, and pile foundation is the large diameter steel pipe pile of diameter 2.80m, bottom ground mud, clay, completely decomposed rock, the about 10m of strong-weathered rock overburden cover, and embedding rock bearing stratum is a gentle breeze granite.
Further, the embedding rock degree of depth of said socketed pile is got 8m, short steel pipes length overall 16m, and its embedding petrosa branch length is 8m.
Under preferred situation, stake end maximum internal force design load is as shown in the table:
Maximal bending moment (kN.m) Respective shaft power (kN) Corresponding shearing (kN)
55720 -26124 8163
Maximum pull (kN) Corresponding moment of flexure (kN.m) Corresponding shearing (kN)
8014 35566 1532
Maximum shear (kN) Respective shaft power (kN) Corresponding moment of flexure (kN.m)
8163 -26124 55720
The steel tube concrete core pillar socketed pile of the utility model utilizes short steel pipes to realize steel tube concrete core pillar embedding rock, improves the Its ultimate bearing capacity of embedding rock structure, thereby reduces pile foundation quantity, saves construction costs.
Description of drawings
Fig. 1 is an irrigated socketed pile sketch map of the prior art
Fig. 2 is the brill rock strike-on piled anchor of the prior art sketch map of constructing admittedly
Fig. 3 is the steel tube concrete core pillar socketed pile in the utility model.
The specific embodiment
For making the purpose of the utility model, technical scheme and advantage are clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to the utility model further explain.
The present technique scheme can be applied to complete straight stake harbour engineering and bridge pier engineering, mainly solves the steel pipe pile foundation embedding rock problem under the big situation of horizontal loading.
With reference to accompanying drawing 3, the steel tube concrete core pillar socketed pile is disclosed, it is from inwardly being made up of following assembly successively outward: the lightweight structures harbour is responsible for 31, expansive concrete 32, short steel pipes 33 and concrete perfusion 34.Wherein to be responsible for 31 diameters be 2.80m to the lightweight structures harbour, and short steel pipes 33 diameters are 2.60m, short steel pipes 33 length overall 16m, and the embedding rock degree of depth of socketed pile is got 8m, and embedding petrosa branch length is 8m.
Described steel tube concrete core pillar socketed pile adopts formula high-pile beam structure in flakes, and pile foundation is the large diameter steel pipe pile of diameter 2.80m, bottom ground mud, clay, completely decomposed rock, the about 10m of strong-weathered rock overburden cover, and embedding rock bearing stratum is a gentle breeze granite.
Table 1 an end maximum internal force design load
Maximal bending moment (kN.m) Respective shaft power (kN) Corresponding shearing (kN)
55720 -26124 8163
Maximum pull (kN) Corresponding moment of flexure (kN.m) Corresponding shearing (kN)
8014 35566 1532
Maximum shear (kN) Respective shaft power (kN) Corresponding moment of flexure (kN.m)
8163 -26124 55720
The embedding rock degree of depth is calculated according to the constant method, and the calculating parameter value is following:
Steel pipe pile diameter D=2.600 m
Steel pipe pile wall thickness δ=0.032 m
Steel pipe pile bending rigidity I=0.213 m4
Elastic modulus E=200000000 kPa
Flexible rigidity EI=42568892 kNm2
Rock counter-force COEFFICIENT K=5000000 kN/m3
β= 0.526 m-1
Lt=3Kd/β= 6.85 m
According to above result of calculation, the embedding rock degree of depth is got 8m.
The saturated compressive strength frc=8000kPa of rock, according to the resistance to compression Design of Bearing Capacity value Qcd=58534kN that " port works socketed pile design and construction rules " are calculated, anti-pulling capacity design load Qtd=29551kN, bearing capacity meets the demands.
Adopt the structural shape of steel tube concrete core pillar, embedding rock short steel pipes diameter is 2.60m, and wall thickness is 32mm, outer filling expansive concrete in the short tube, and the bearing capacity of embedding rock structure calculates by encased structures, and main formulas for calculating is following:
Nu=φ1φ2N0
N0=fcAc(1+θ0.5+θ)
θ=faAa/fcAc
Structure is in precarious position when maximal bending moment respective shaft power and shearing, gets a stake end moment M=55720kNm, and a stake end axle power N=26124kN calculates with a stake end shear Q=8163kN.Through calculating, Nu=65286kN holds axle power N less than the stake of calculating, and adopts steel tube concrete core pillar embedding rock to meet design requirement.
The beneficial effect that the utility model technical scheme is brought
1) solved horizontal loading than the embedding rock problem under the big situation
Steel tube concrete core pillar embedding rock structure not only has good vertical load supporting capacity, and can bear bigger horizontal loading, is applicable to the complete straight stake harbour of major diameter under the large diameter steel pipe pile embedding rock, particularly batholith shallow embedding situation.
2) made things convenient for the construction of large diameter steel pipe pile socketed pile
Steel tube concrete core pillar embedding rock structure can be adjusted the short steel pipes diameter according to structural internal force; The inside and outside perfusion plain concrete that only needs of steel pipe; More traditional irrigated embedding rock and embedded type embedding rock have reduced reinforcing cage transfers and pile foundation operation such as injection repeatedly, has made things convenient for construction largely.
3) effectively reduce construction costs
Because steel tube concrete core pillar embedding rock structure has good vertical, level to supporting capacity; This provides condition for the use of large diameter pile foundation, thereby effectively reduces stake in quantity, increases efficiency of construction; Save construction costs; For 20 ton ore terminals under the batholith shallow embedding condition, it is about 22% to reduce the pile foundation cost than irrigated embedding rock, reduces pile foundation cost about 16% than embedded type embedding rock.
The said device of the utility model not only can be used for socketed pile; Also can be used to the place that other can be suitable for, should be pointed out that the above only is the preferred implementation method of the utility model; For the person of ordinary skill of the art; Under the prerequisite that does not break away from the utility model principle, can also make some improvement and variation, these improvement and variation also should be regarded as the protection domain of the utility model.

Claims (4)

1. steel tube concrete core pillar socketed pile is characterized in that: it is from inwardly being made up of following assembly successively outward: the lightweight structures harbour is responsible for, expansive concrete, short steel pipes and concrete perfusion.
2. steel tube concrete core pillar socketed pile as claimed in claim 1 is characterized in that: said short steel pipes diameter is 2.60m, and wall thickness is 32mm, concrete perfusion in the short tube outer filling expansive concrete, short tube.
3. steel tube concrete core pillar socketed pile as claimed in claim 1; It is characterized in that: this socketed pile adopts formula high-pile beam structure in flakes; Pile foundation is the large diameter steel pipe pile of diameter 2.80m; Bottom ground mud, clay, completely decomposed rock, the about 10m of strong-weathered rock overburden cover, embedding rock bearing stratum is a gentle breeze granite.
4. steel tube concrete core pillar socketed pile as claimed in claim 1 is characterized in that: the embedding rock degree of depth of said socketed pile is got 8m, short steel pipes length overall 16m, and its embedding petrosa branch length is 8m.
CN2011202497383U 2011-07-15 2011-07-15 Socketed pile with concrete-filled steel tube core column Expired - Lifetime CN202187340U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011202497383U CN202187340U (en) 2011-07-15 2011-07-15 Socketed pile with concrete-filled steel tube core column

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011202497383U CN202187340U (en) 2011-07-15 2011-07-15 Socketed pile with concrete-filled steel tube core column

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102286971A (en) * 2011-07-15 2011-12-21 中交水运规划设计院有限公司 Concrete-filled steel tube core column socketed pile
CN105908773A (en) * 2016-06-12 2016-08-31 上海勘测设计研究院有限公司 Two-stage socketed pile wind turbine foundation for shallow covering stratum foundation of offshore wind plant and construction method
CN106320335A (en) * 2015-06-25 2017-01-11 昆明捷程桩工有限责任公司 A single-pile variable-diameter rock-socketed secant pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102286971A (en) * 2011-07-15 2011-12-21 中交水运规划设计院有限公司 Concrete-filled steel tube core column socketed pile
CN106320335A (en) * 2015-06-25 2017-01-11 昆明捷程桩工有限责任公司 A single-pile variable-diameter rock-socketed secant pile
CN105908773A (en) * 2016-06-12 2016-08-31 上海勘测设计研究院有限公司 Two-stage socketed pile wind turbine foundation for shallow covering stratum foundation of offshore wind plant and construction method

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Granted publication date: 20120411

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