CN85205055U - Prestressed concrete pile - Google Patents
Prestressed concrete pile Download PDFInfo
- Publication number
- CN85205055U CN85205055U CN 85205055 CN85205055U CN85205055U CN 85205055 U CN85205055 U CN 85205055U CN 85205055 CN85205055 CN 85205055 CN 85205055 U CN85205055 U CN 85205055U CN 85205055 U CN85205055 U CN 85205055U
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- pile
- prestressed concrete
- concrete
- foundation pile
- stake
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Abstract
The utility model is pre-stretching type prestressed concrete foundation pile. A reinforcing cage shaped before hand is arranged in a steel mold, high-strength concrete is filled; a prestressed concrete pole is formed by stretching steel reinforcement through centrifugal shaping and steam curing stripping process. The pre-stretching type prestressed concrete foundation pile can be used as a foundation pile for mine industry, high-rise building in cities, bridge pier, harbor and the building in coastal area. The connection method of each two piles is simple and reliable, and the length and diameter of the piles are different, so the pre-stretching type prestressed concrete foundation pile is suitable for the need of different engineering.
Description
The utility model is to belong to the pre-tensioned prestressed concrete tubular articles.
At present at industrial and mining enterprises, urban skyscraper, bridge, port and pier, and in the construction work of coastal area,, often adopt pile foundation for satisfying the supporting capacity on basis.Because castinplace pile and driven pile are often adopted in the restriction of conditions such as the requirement of engineering, the difference of basic geology and construction technology level.Castinplace pile is divided into boring, punching and manually digging hole filling pile again.Driven pile has precast concrete square pile, prefabricated concrete pipe pile and piling bar.Piling bar has antirust problem, especially uses to be restricted under the groundwater quality condition of severe.In order to save steel, to reduce construction costs, adopt concrete pile more and more general at present both at home and abroad.In order to improve impact force that concrete pile bears pile driver, to improve the penetrability of stake, even firm stratum also can be passed smoothly running into complicated pile breaking phenomenon does not take place.Engineers both domestic and external is in recent years improving concrete strength, is making number of research projects with prestressed reinforcement manufacturing prestressed concrete pile.For example, No. 79140585 patents of Japan Patent, the inventor is in order to improve concrete intensity, and blending by volume about 1% steel wire and is 7～12% additive of cement weight, concrete compressive strength R in concrete
28=767kg/cm
2, adopting above-mentioned measure, concrete resistance to compression and tensile strength all increase, but have increased construction costs undoubtedly, and manufacturing process is also quite complicated.Again for example, No. 73900 patents of HOII P, the inventor has described a kind of callable prestressing force reinforcement spare, this reinforcement spare is made up of a prestressing force reinforced bar, and import a nut that is fixed on the stake axle by lower bolt end in the hollow hole of foundation pile and screw, and a termination of bearing the impact force of pile driver in the stake in driving in process is arranged.This structure is to save steel, but because stake itself does not contain reinforcing bar, this increases many procedures just for transportation and work progress, and the simultaneously used pile cover and the structure of shoe are also quite complicated.
The purpose of this utility model provides a kind of prestressed concrete pipe pile, is intended to promote the solution of the problems referred to above, realizes a kind of high-strength prestressed concrete pipe pile.
Task of the present utility model is finished as follows, and pile tube comprises that one group is cast in tension reinforcing steel bar in the concrete and one group in order to the fixing anchor rod of pile tube and steel hoop, and anchor rod is evenly distributed on two ends of pile tube.The diameter of pile tube is 300 millimeters to 1500 millimeters, and length is 6 meters to 14 meters, and its concrete crushing strength is 800kg/cm
2To 1000kg/cm
2
Prestressed concrete pipe pile provided by the utility model, because the concrete strength height, the penetrating force of stake is strong, and the method for attachment between stake and the stake is simple and reliable, goes for the foundation pile of different requirement of engineering.
Fig. 1 is the constructional drawing of prestressed concrete pile.(1) prestressed concrete pile among the figure; (2) tension reinforcing steel bar; (3) spiral stirrup; (4) anchor rod; (5) steel hoop; (6) anchor disc of steel hoop.
Fig. 2 (a) is the joint construction figure of stake (1) and steel hoop (5); Fig. 2 (b) is the joint construction figure of steel hoop (5) and anchor rod; Fig. 2 (c) is the amplification constructional drawing of the reservation groove (7) of anchor disc.
Below in conjunction with accompanying drawing the utility model is described in further detail:
The cage of reinforcement of moulding in advance is placed in the punching block, cast is mixed the concrete mixture that forms by the high-strength concrete design mixture proportion, and tension reinforcing steel bar applies prestressing force then, through the centrifuge centrifugal forming, after the stream curing demoulding, prestressed concrete pile has just been made.
The used high-strength concrete design mixture proportion (calculating by the absolute volume method) of the utility model is:
Cement 450-600kg/M
3
Sand coarse aggregate ratio 0.27-0.35
Water/binder ratio 0.28-0.36
Water reducing agent (accounting for cement consumption) 0.5-2.0%
For the technology that simplifies the operation, make things convenient for site operation, this match ratio can be mixed a kind of water reducing agent of powdery.Concrete crushing strength R according to above-mentioned design mixture proportion making
38=800kg/cm
2To 1000kg/cm
2
The utility model adopts the pre-tensioned prestressing method, utilizes the centrifuge centrifugal forming, and its centrifuge speed is 300～1000 rev/mins.Conservation system is divided into: a maintenance, its temperature are 60 ℃-80 ℃, and curing time is 5～9 hours; The secondary maintenance can be adopted steam curing at high pressure, and its curing temperature is 180 ℃～200 ℃, and the time is 5～8 hours, also can adopt curing in water, and temperature is 20 ℃～25 ℃, and the time is 12～16 days.Two kinds of methods can get a desired effect equally, manufacture method according to above-mentioned prestressed concrete pile, can produce the series of products of prestressed concrete pile, the diameter D of pile tube is 300 millimeters to 1500 millimeters, length L is 6 meters to 14 meters, to be applicable to the needs of different engineerings and geological conditions.
Prestressed concrete pile according to manufacturing of the present invention, comprise that one group is cast in tension reinforcing steel bar in the concrete (2) and one group of anchor rod (4) in order to spud pile (1) and steel hoop (5), this anchor rod is evenly distributed on two terminations of stake (1), its length is 40 centimeters, and diameter is 12 millimeters.It is welded together admittedly that the anchor disc (6) of it and steel hoop (4) is that electricity consumption welds, and forms an integral body, and tension reinforcing steel bar (2) adopts the heading tension mode to fix with anchor disc (6).In order to make stake (1) end local cracks not take place bearing under the excessive shaft pressuring load situation, in stake (1) end along L
2In the length range, encrypt spiral stirrup (3), along with tension reinforcing steel bar (2) diameter overstriking, the also corresponding overstriking of the diameter of spiral stirrup (3).According to the prestressed concrete pile of this novel manufacturing, can be suitable for the length of the required stake of different engineerings and geological conditions at the scene with the electric welding splicing.Stake with to be connected be to rely on the position of reservation groove (7) of anchor disc (6) to carry out electric welding, scolder fills up the reservation groove (7) of anchor disc (6), brushes special-purpose inhibitor then, in case on abominable especially stratum or the corrosion of seawater.Weld strength is greater than the intensity of stake itself.The practical experience proof is safe and reliable with this welding method.
In addition, the anti-impact force and the penetration capacity of the prestressed concrete pile of producing for the above-mentioned manufacture method of test basis are done following experiment in test room.With three diameter D=500mm, length L=8m, concrete design compressive strength 800kg/cm
2Prestressed concrete pile, do bending property test.Its result of the test and calculated value compare, and the cracking moment calculated value is according to the TJ10-74 modular formula:
M
f＝（σ
hⅡ＋γR
S L）W
0
Calculate and get.The ultimate bending moment calculated value is according to the TJ10-74 modular formula:
M
P＝〔R
WA (r
1+r
2)/2 ＋（R
y S＋σ′
ya）A
yr
y〕 (stmπα)/(π)
Calculate and get.Experiment value and theoretical value relatively list in table 1.
This shows that the calculated value of ultimate bending moment and test value are very approaching.Because prestressed concrete pile mainly is used as the basis of building and structure, the axial load carrying capacity of stake own is one of its important performance, manufacturing process for the check stake, in test room, utilize three diameter D=500mm equally, length L=3.5 meter, concrete design compressive strength is 800kg/cm
2, do the axial load carrying capacity test of stake, its result of the test rupture load is 800 tons.The supporting capacity calculated value is according to the TJ10-74 modular formula:
N
P=φ (R
aTon A+ σ ' yaAy ')=798.5
As seen, supporting capacity calculated value and test value extremely are close.Prove from domestic and international a large amount of practical experiences.The general service load of the used stake of this test that allows is not more than 160 tons, and the safety factor of this stake that hence one can see that is 5 times.
Table 2 is the design mixture proportion of three kinds of high-strength concretes.Table 3 is the concrete data and the size of tension reinforcing steel bar, spiral stirrup, steel hoop, anchor disc and the reservation groove of three kinds of pile tube diameters.
Table 2
Claims (1)
1, a kind of by centrifugal forming and stream curing and the prestressed concrete pipe pile that constitutes it is characterized in that:
(1) diameter of pile tube is 300 millimeters to 1500 millimeters,
(2) length of pile tube is 6 meters to 14 meters,
(3) concrete crushing strength R
28=800kg/cm
2To 1000kg/cm
2,
(4) pile tube [1] comprises that one group is cast in tension reinforcing steel bar [2] in the concrete and one group in order to fixing pile tube [1] anchor rod [4] with steel hoop,
(5) anchor rod [4] is evenly distributed on two ends of pile tube [1].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85205055 CN85205055U (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85205055 CN85205055U (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85205055U true CN85205055U (en) | 1987-04-01 |
Family
ID=4800218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85205055 Expired - Lifetime CN85205055U (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85205055U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538145A (en) * | 2013-10-24 | 2014-01-29 | 华煜建设集团有限公司 | Long-tube-section precast concrete pile construction method |
| CN115573331A (en) * | 2022-10-25 | 2023-01-06 | 南京交通职业技术学院 | Reinforcement hoop prestress waste mud curing pile-forming method |
-
1985
- 1985-11-30 CN CN 85205055 patent/CN85205055U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538145A (en) * | 2013-10-24 | 2014-01-29 | 华煜建设集团有限公司 | Long-tube-section precast concrete pile construction method |
| CN115573331A (en) * | 2022-10-25 | 2023-01-06 | 南京交通职业技术学院 | Reinforcement hoop prestress waste mud curing pile-forming method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |