CN203639902U - Preformed pile with high-strength stirrups - Google Patents
Preformed pile with high-strength stirrups Download PDFInfo
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- CN203639902U CN203639902U CN201320816267.9U CN201320816267U CN203639902U CN 203639902 U CN203639902 U CN 203639902U CN 201320816267 U CN201320816267 U CN 201320816267U CN 203639902 U CN203639902 U CN 203639902U
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Abstract
A preformed pile with high-strength stirrups comprises a steel reinforcement cage framework and concrete, wherein the steel reinforcement cage framework is located in the concrete and comprises a vertical steel reinforcement and the stirrups; the stirrups are connected with the vertical steel reinforcement; the stirrups are distributed sequentially in the length direction of a pile body from top to bottom; the stirrups are high-strength hot rolled steel reinforcements; the upper end and the lower end of the pile body are stirrup dense areas; the middle of the pile body is a stirrup non-dense area. The preformed pile with the high-strength stirrups improve shear resistance and shock resistance.
Description
Technical field
The utility model relates to a kind of preformed pile.
Background technology
The conventional reinforcing bar of stirrup adopting in China's preformed pile is at present hot rolling steel-bar (the HPB235 level of cold worked reinforcing bar or minor diameter, new criteria changes HPB300 into, symbol is " ф "), cold-finished steel is prohibited from using because of the requirement that does not meet antidetonation, and low intensive hot rolling dish circle muscle becomes main form as stirrup.Low intensive HRB235 or HRB300 reinforcing bar have used decades as the main material of China's steel concrete stirrup, never have large change, although its intensity is lower, but due to its good ductility, the stirrup material of conduct stake always or other building structural element, along with deepening continuously, correlative study constantly promotes with main steel bar stress (vertical reinforcement in stake) intensity, the phenomenon of exposed day by day stirrup strength deficiency, especially in the higher area of seismic fortification intensity, constantly there is the phenomenon of the anti-horizontal shear scarce capacity of pile body, need to improve the shear-carrying capacity of pile body, mode is in the past that the method by improving the strength grade of pile concrete and the strength grade of vertical applied force reinforcing bar improves pile body shear-carrying capacity, the mode that has no to improve stirrup strengthens the shear-carrying capacity of pile body, and stirrup is highly effective to the raising of pile body cross section shear resistance.
Summary of the invention
In order to overcome the deficiency that shear-carrying capacity is less, shock resistance is poor of existing preformed pile, the utility model provides a kind of preformed pile with high-strength stirrup that increases shear-carrying capacity, promotes shock resistance.
The utility model solves the technical scheme that its technical problem adopts:
A kind of preformed pile with high-strength stirrup, comprise reinforcement cage skeleton and concrete, described reinforcement cage skeleton is arranged in concrete, described reinforcement cage skeleton comprises vertical reinforcement and stirrup, stirrup is connected with vertical reinforcement, and described stirrup distributes from top to bottom successively along pile body length direction, and described stirrup is hot-rolled reinforced bar, the two ends up and down of pile body are hoop reinforcement, and the middle part of described pile body is stirrup non-encrypted area.
Further, the ratio of the stirrup spacing of the stirrup spacing of described hoop reinforcement and described stirrup non-encrypted area is less than or equal to 1/2nd.Certainly, also can select other ratios.
The Wei Shang hoop reinforcement, upper end of pile body, the Wei Xia hoop reinforcement, lower end of pile body, the siding-to-siding block length of He Xia hoop reinforcement, described upper hoop reinforcement can be identical, certainly, can be not identical yet.
Further again, the profile of described stirrup is identical with the profile of pile body, and the profile of described stirrup is annular or polygon.The such as polygon such as square, rectangle, octagon, hexagon, pentagon.
Described stirrup distributes along pile body total length.
Described stirrup adopts spiral way to distribute, and neighbouring stirrup is end to end.Also can be the independent stirrup that head and the tail do not join.
Described stirrup comprises high-strength hot rolled reinforced bar and non-high-strength hot rolled reinforced bar, alternately distributes one by one along pile body length.
Described vertical reinforcement comprises prestressed reinforcement.Or described vertical reinforcement comprises nonprestressed reinforcement.Again or, described vertical reinforcement comprises prestressed reinforcement and nonprestressed reinforcement, part be prestressed reinforcement, part is nonprestressed reinforcement, is alternately distributed along prestressed reinforcement around preformed pile and nonprestressed reinforcement.Technical conceive of the present utility model is: according to the achievement in research of each side, for the pile foundation with shockproof requirements, except needs bear vertical load, also need to bear the effect of horizontal shear, and stake in stirrup configuration effect be mainly to act on to resist horizontal shear force, the intensity that improves stirrup can obviously promote the horizontal shear strength of pile body, pile body is considered as being subject to the concrete component of horizontal force action, uses existing anti-" Code for design of concrete structures " member shear-carrying capacity design formulas and can obviously see:
In formula, α β is experiment regression coefficient; f
c, A
cbe respectively concrete compressive strength and concrete effective active area; f
v, A
st, s is respectively the shear strength of stirrup, stirrup sectional area and stirrup spacing, the intensity of visible stirrup is proportional to pile body shear-carrying capacity, improves stirrup intensity and can directly improve the shear-carrying capacity of pile body.
Owing to having strengthened the intensity of stirrup, can improve the lateral restraint effect of stirrup to pile concrete, can improve concrete intensity inside stirrup, also be just conducive to improve the vertical bearing capacity of pile body.
High-intensity hot-rolled reinforced bar HRB400 or HRB500 not only have higher shear-carrying capacity (both shear strength design loads improve 33% than HPB300 reinforcing bar) but also the ultimate extension ability of reinforcing bar is just slightly worse than HPB235 or HPB300 reinforcing bar, and far exceed the vertical prestressing reinforcing bar in pile body, so adopting high-strength hot rolled reinforced bar is the requirement that meets pile body ductility completely as the stirrup of pile body, is secure to the shock resistance of pile body.
The beneficial effects of the utility model are mainly manifested in:.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the preformed pile with high-strength stirrup.
Fig. 2 is the pile body distribution schematic diagram of stirrup.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
See figures.1.and.2, a kind of preformed pile with high-strength stirrup, comprise reinforcement cage skeleton and concrete, described reinforcement cage skeleton is arranged in concrete, and 3. described reinforcement cage skeleton comprises vertical reinforcement and stirrup, and 3. stirrup is connected with vertical reinforcement, described stirrup distributes from top to bottom successively along pile body length direction, described stirrup is hot-rolled reinforced bar (being preferably high strength cast iron HRB400 or HRB500), and the two ends up and down of pile body are hoop reinforcement, and the middle part of described pile body is stirrup non-encrypted area.
Further, the ratio of the stirrup spacing of the stirrup spacing of described hoop reinforcement and described stirrup non-encrypted area is less than or equal to 1/2nd.Certainly, also can select other ratios.
The Wei Shang hoop reinforcement, upper end of pile body, the Wei Xia hoop reinforcement, lower end of pile body, the siding-to-siding block length of He Xia hoop reinforcement, described upper hoop reinforcement is identical.Certainly, can be not identical yet.
Further again, described stirrup profile is 3. identical with the profile of pile body, and the profile of described stirrup is annular or polygon.The such as polygon such as square, rectangle, octagon, hexagon, pentagon.
3. described stirrup distributes along pile body total length.
3. described stirrup adopts spiral way to distribute, and neighbouring stirrup is end to end.Also can be the independent stirrup that head and the tail do not join.。
3. described stirrup comprises high-strength hot rolled reinforced bar and non-high-strength hot rolled reinforced bar, alternately distributes one by one along pile body length.
Described vertical reinforcement comprises that prestressed reinforcement 2..Or described vertical reinforcement comprises that nonprestressed reinforcement 1..Again or, described vertical reinforcement comprises prestressed reinforcement and nonprestressed reinforcement, part be prestressed reinforcement, part is nonprestressed reinforcement, is alternately distributed along prestressed reinforcement around preformed pile and nonprestressed reinforcement.
In the present embodiment, this pile tube comprises the fixing end plate of concrete and reinforcement cage skeleton two ends, and described concrete strength grade 4. generally should be lower than C40; Described reinforcement cage skeleton comprise prestressed reinforcement 2., nonprestressed reinforcement 1., stirrup 3., prestressed reinforcement wherein and the configuration of nonprestressed reinforcement should be determined as required, can all adopt presstressed reinforcing steel or all adopt non-prestressing tendon, also can adopt partial prestressing muscle and part non-prestressing tendon; 1. 2. described prestressed reinforcement be evenly distributed on 3. inner side of stirrup with nonprestressed reinforcement.
3. described stirrup adopts high strength cast iron HRB400 or HRB500, and 3. stirrup needs to form ring-type, and its profile can change according to the profile of pile body; 3. stirrup distributes along pile body total length, can adopt spiral way to distribute, and also can be combined with non-high-strength stirrup, distributes one by one along pile body length is independent; Stirrup and vertical reinforcement are by being weldingly connected.
Described pile body two ends are hoop reinforcement, and encrypted area length and encrypted area stirrup spacing are chosen according to designing requirement.
The above embodiment is explanation to technical solutions of the utility model and unrestricted, other modifications that are equal to replacement or make according to prior art of affiliated technical field those of ordinary skill, as long as do not exceed thinking and the scope of technical solutions of the utility model, within all should being included in the desired claim scope of the utility model.
Claims (10)
1. the preformed pile with high-strength stirrup, comprise reinforcement cage skeleton and concrete, described reinforcement cage skeleton is arranged in concrete, described reinforcement cage skeleton comprises vertical reinforcement and stirrup, stirrup is connected with vertical reinforcement, and described stirrup distributes from top to bottom successively along pile body length direction, it is characterized in that: described stirrup is hot-rolled reinforced bar, the two ends up and down of pile body are hoop reinforcement, and the middle part of described pile body is stirrup non-encrypted area.
2. the preformed pile with high-strength stirrup as claimed in claim 1, is characterized in that: the ratio of the stirrup spacing of the stirrup spacing of described hoop reinforcement and described stirrup non-encrypted area is less than or equal to 1/2nd.
3. the preformed pile with high-strength stirrup as claimed in claim 1 or 2, is characterized in that: the siding-to-siding block length of upper and lower hoop reinforcement is identical.
4. the preformed pile with high-strength stirrup as claimed in claim 1 or 2, is characterized in that: the profile of described stirrup is identical with the profile of pile body, the profile of described stirrup is annular or polygon.
5. the preformed pile with high-strength stirrup as claimed in claim 4, is characterized in that: described stirrup distributes along pile body total length.
6. the preformed pile with high-strength stirrup as claimed in claim 5, is characterized in that: described stirrup adopts spiral way to distribute, and neighbouring stirrup is end to end, can be also the independent stirrup that head and the tail do not join.
7. the preformed pile with high-strength stirrup as claimed in claim 5, is characterized in that: described stirrup comprises high-strength hot rolled reinforced bar and non-high-strength hot rolled reinforced bar, alternately distributes one by one along pile body length.
8. the preformed pile with high-strength stirrup as claimed in claim 1 or 2, is characterized in that: described vertical reinforcement comprises prestressed reinforcement.
9. the preformed pile with high-strength stirrup as claimed in claim 1 or 2, is characterized in that: described vertical reinforcement comprises nonprestressed reinforcement.
10. the preformed pile with high-strength stirrup as claimed in claim 1 or 2, is characterized in that: described vertical reinforcement comprises prestressed reinforcement and nonprestressed reinforcement, and along preformed pile, around prestressed reinforcement and nonprestressed reinforcement are alternately distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320816267.9U CN203639902U (en) | 2013-12-11 | 2013-12-11 | Preformed pile with high-strength stirrups |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320816267.9U CN203639902U (en) | 2013-12-11 | 2013-12-11 | Preformed pile with high-strength stirrups |
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| Publication Number | Publication Date |
|---|---|
| CN203639902U true CN203639902U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320816267.9U Expired - Fee Related CN203639902U (en) | 2013-12-11 | 2013-12-11 | Preformed pile with high-strength stirrups |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256791A (en) * | 2015-11-18 | 2016-01-20 | 黄贺明 | Concrete tubular pile for oceans |
-
2013
- 2013-12-11 CN CN201320816267.9U patent/CN203639902U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256791A (en) * | 2015-11-18 | 2016-01-20 | 黄贺明 | Concrete tubular pile for oceans |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20161211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |